When calibrating pressure sensors, pressure transmitters, pressure switches, or digital pressure gauges, selecting the correct pressure range plays a crucial role. The better the selected measurement range matches the actual calibration task, the lower the measurement uncertainty can be. In practice, however, very different pressure ranges often need to be covered – from just a few millibars to several tens or even hundreds of bar.
This is exactly where auto-ranging comes into play. Modern pressure controllers can automatically select the most suitable pressure range and thereby provide high accuracy across a wider operating range. For calibration laboratories, test benches, and industrial quality assurance, this means less setup effort, faster test procedures, and better utilization of existing measurement equipment.
A particularly practical example is the PACE6000E Precision Pressure Controller from Druck. Thanks to its dual-channel architecture, it can be equipped with two control modules, making it ideal for applications where different pressure ranges need to be used automatically and efficiently. In this article, we explain what auto-ranging means, how it works, and when this function is particularly beneficial.
Table of Contents
- What Does Auto-Ranging Mean?
- How Does Auto-Ranging Work Technically?
- Why Measurement Accuracy Depends on the Selected Pressure Range
- The Problem with Traditional Single-Channel Pressure Controllers
- Auto-Ranging Using the PACE6000E as an Example
- Example: Calibrating from 100 mbar to 70 bar with a Single Instrument
- Advantages of Auto-Ranging in Calibration Laboratories
- Auto-Ranging in Automated Test Benches
- Auto-Ranging and Measurement Uncertainty
- Which Pressure Ranges Can Be Combined Effectively?
- CM and CM3 Control Modules as the Foundation of Auto-Ranging
- TERPS Technology and Its Importance for Auto-Ranging
- When Is Auto-Ranging Most Beneficial?
- Auto-Ranging vs. Multiple Individual Pressure Controllers
- Practical Example: How Auto-Ranging Can Reduce Calibration Time by Several Hours per Week
- Conclusion: Why Auto-Ranging Has Become a Standard Feature of Modern Pressure Controllers
- Frequently Asked Questions About Auto-Ranging in Pressure Controllers
What Does Auto-Ranging Mean?
Auto-ranging refers to the ability of a pressure controller to automatically select the optimal pressure range for the current measurement task. The user does not need to change pressure modules or manually switch between different measurement ranges.
The goal of auto-ranging is to achieve the highest possible accuracy across the widest possible pressure range. This is because the accuracy of a pressure controller depends not only on the quality of the sensor but also on how well the selected pressure range matches the actual test pressure.
As a general rule, the smaller the selected pressure range relative to the measured value, the better the resolution and measurement uncertainty.
| Test Pressure | Pressure Range 0 … 1 bar | Pressure Range 0 … 70 bar |
|---|---|---|
| 0.5 bar | Very high accuracy | Lower resolution |
| 50 bar | Not usable | Optimally suited |
Without auto-ranging, the user would either have to use multiple pressure controllers or regularly replace pressure modules when working with different pressure ranges. This consumes time and increases the risk of operator errors.
With auto-ranging, the selection of the optimal pressure range is performed automatically. The system always uses the pressure range that provides the highest accuracy and the lowest measurement uncertainty.
Practical Example
A calibration laboratory tests pressure transmitters with measurement ranges from 250 mbar to 70 bar every day. Without auto-ranging, multiple reference instruments would be required, or pressure modules would need to be exchanged regularly.
With auto-ranging, a modern pressure controller such as the PACE6000E can automatically switch between two installed pressure ranges and use the optimal range for every calibration point.
| Without Auto-Ranging | With Auto-Ranging |
|---|---|
| Manual range selection | Automatic range selection |
| Regular reconfiguration required | No reconfiguration required |
| Higher time expenditure | Faster calibration |
| More potential for operator errors | Fewer sources of error |
| Multiple reference instruments required | One system covers multiple ranges |
Auto-ranging is therefore much more than a convenience feature. It improves measurement quality, reduces setup times, and significantly increases the productivity of calibration laboratories, test benches, and automated calibration systems.
How Does Auto-Ranging Work Technically?
For auto-ranging to be possible, multiple pressure ranges must be available within a single system. Modern pressure controllers achieve this through the use of multiple independent control modules with different pressure ranges.
A good example is the PACE6000E Pressure Controller. Thanks to its dual-channel architecture, two different CM or CM3 control modules can be installed simultaneously.
This means that two pressure ranges are permanently available. The pressure controller independently determines which range provides the highest accuracy for the current calibration point.
| Installed Module | Pressure Range |
|---|---|
| CM3 Control Module A | 0 … 1 bar |
| CM3 Control Module B | 0 … 70 bar |
During calibration, the system continuously analyzes the current setpoint and automatically uses the module with the best resolution and the lowest measurement uncertainty.
Example of Automatic Range Selection
| Calibration Point | Module Used |
|---|---|
| 0.2 bar | CM3 Module 0 … 1 bar |
| 0.8 bar | CM3 Module 0 … 1 bar |
| 5 bar | CM3 Module 0 … 70 bar |
| 20 bar | CM3 Module 0 … 70 bar |
| 50 bar | CM3 Module 0 … 70 bar |
For the user, this switching process is completely automatic. Neither the calibration software nor the operator needs to intervene. The system always operates with the pressure range that is optimally suited to the respective measurement point.
The advantages of this technology become particularly apparent in automated calibrations involving many different devices under test. For example, a calibration laboratory can calibrate sensors in the millibar range in the morning and pressure transmitters up to 70 bar just a few minutes later without performing any hardware modifications or changing instruments.
- Automatic selection of the optimal pressure range
- No manual switching required
- No module changes during the calibration process
- Higher measurement accuracy across a wide pressure range
- Ideal for automated calibrations
Combined with high-precision CM3 control modules and TERPS sensor technology, auto-ranging delivers a powerful combination of maximum accuracy, outstanding flexibility, and significantly shorter calibration times.
Why Measurement Accuracy Depends on the Selected Pressure Range
Many users assume that the accuracy of a pressure controller is determined solely by the pressure sensor installed within it. In reality, however, the selected pressure range also plays a critical role.
Most pressure sensors and control modules specify their accuracy as a percentage of the measurement range. As a result, the achievable measurement uncertainty changes depending on the pressure range used for the calibration.
As a general rule, the closer the actual test pressure is to the optimal measurement range, the better the resolution, repeatability, and measurement uncertainty.
Example Without Auto-Ranging
Assume that a pressure controller has only one pressure range from 0 to 70 bar. Now a pressure sensor needs to be calibrated at 0.5 bar.
Although this is technically possible, the sensor uses only a very small portion of the available measurement range. The result is lower resolution compared to a control module specifically designed for low-pressure applications.
| Calibration Point | 0 … 1 bar Module | 0 … 70 bar Module |
|---|---|---|
| 0.5 bar | Very high resolution | Significantly lower resolution |
| 0.8 bar | Optimal | Not optimal |
| 50 bar | Not usable | Optimal |
This example clearly shows why different pressure ranges are required for different applications. A single large pressure range may cover many tasks, but it does not always provide the best possible accuracy.
The Challenge in Calibration Laboratories
In practice, calibration laboratories often need to test pressure instruments with very different measuring ranges:
- Differential pressure sensors in the millibar range
- Pressure transmitters for process plants
- Hydraulic sensors with high pressure ranges
- Digital precision pressure gauges
- Pressure switches with different switching points
If a separate pressure controller were used for every application, investment costs, space requirements, and operating effort would be correspondingly high.
How Auto-Ranging Solves This Problem
Auto-ranging ensures that the pressure range with the best measurement performance is selected automatically. The user no longer needs to worry about which control module currently provides the highest accuracy.
A pressure controller such as the PACE6000E analyzes the current calibration point and automatically uses the most suitable CM or CM3 control module.
| Calibration Point | Automatically Selected Module |
|---|---|
| 0.2 bar | 0 … 1 bar CM3 module |
| 0.8 bar | 0 … 1 bar CM3 module |
| 10 bar | 0 … 70 bar CM3 module |
| 50 bar | 0 … 70 bar CM3 module |
This ensures that the calibration is always performed with the best possible measurement uncertainty. At the same time, manual switching and reconfiguration are eliminated.
Benefits for the User
- Higher accuracy across wide pressure ranges
- Improved measurement uncertainty
- Optimal use of installed control modules
- No manual range changes
- Fewer operator errors
- Faster calibration procedures
This is why auto-ranging has become one of the most important features of modern reference pressure controllers and is particularly valuable in calibration laboratories, automated test benches, and demanding calibration applications.
The Problem with Traditional Single-Channel Pressure Controllers
Many pressure controllers and pressure regulators have only one installed pressure range. For many applications, this is perfectly sufficient. However, difficulties arise when devices under test with very different measuring ranges need to be calibrated regularly.
A typical example is a calibration laboratory that tests pressure sensors in the range of a few hundred millibar in the morning and pressure transmitters with ranges of 40 or 70 bar in the afternoon.
With a traditional single-channel pressure controller, there are two possible approaches:
- Use only one large pressure range.
- Regularly adapt the pressure range by changing modules.
Both approaches have disadvantages.
Option 1: One Large Pressure Range for All Applications
At first glance, this solution appears particularly simple. A pressure controller with a large pressure range covers many applications and requires no reconfiguration.
In practice, however, measurement performance often suffers at low pressure values. If, for example, a 70 bar control module is used to calibrate a pressure sensor at 0.2 or 0.5 bar, only a very small portion of the available measuring range is used.
| Test Pressure | 0 … 1 bar Module | 0 … 70 bar Module |
|---|---|---|
| 0.2 bar | Optimal | Significantly poorer resolution |
| 0.5 bar | Optimal | Significantly poorer resolution |
| 50 bar | Not usable | Optimal |
The result is higher measurement uncertainty and less effective use of the available measurement technology.
Option 2: Regular Module Changes
The second option is to adapt the pressure range to the current task. This requires changing pressure modules or even complete reference systems.
This may optimize measurement accuracy, but it also creates new challenges:
- Additional setup time
- Higher operating effort
- Interruption of automated test sequences
- Increased risk of operator errors
- Lower productivity
Especially when large numbers of instruments are calibrated, these time losses can quickly add up to several hours per week.
Impact on Automated Test Benches
This disadvantage is particularly significant in automated test benches. As soon as an operator has to intervene and manually change the pressure range, part of the automation benefit is lost.
Automated calibration processes rely on tests being performed without interruptions and without manual intervention. Every required module change reduces the efficiency of the overall system.
| Traditional Single-Channel Pressure Controller | Auto-Ranging System |
|---|---|
| Manual range switching | Automatic range selection |
| Regular reconfiguration | No reconfiguration required |
| Higher personnel effort | Minimal operator effort |
| Interruption of automated sequences | Continuous automation |
| Productivity losses | Maximum efficiency |
Why Modern Pressure Controllers Use Auto-Ranging
Modern systems such as the PACE6000E Pressure Controller were developed specifically to avoid these limitations.
By using two different CM or CM3 control modules simultaneously, multiple pressure ranges are permanently available. The system automatically selects the range with the highest accuracy and uses it for the current calibration.
The user benefits from both worlds:
- High accuracy at low pressure values
- Large measuring ranges for high-pressure applications
- No manual reconfiguration
- Higher productivity
- Full automation capability
This is precisely why auto-ranging has become established as a standard function in modern calibration laboratories and automated test benches and is regarded by many users as indispensable.
Auto-Ranging Using the PACE6000E as an Example
The functionality of auto-ranging can be explained particularly well using the PACE6000E Pressure Controller. This system was specifically developed for high-precision calibration and testing applications and features a dual-channel architecture that allows two different control modules to be installed simultaneously.
Unlike traditional single-channel pressure controllers, the PACE6000E can provide multiple pressure ranges at the same time. Users no longer need to exchange pressure modules or maintain several separate reference instruments.
This creates a significant productivity advantage, especially in calibration laboratories that routinely calibrate pressure instruments covering a wide range of pressure levels.
Typical Auto-Ranging Configuration
A common configuration combines a low-pressure module with a high-pressure module.
| Control Module | Pressure Range | Typical Application |
|---|---|---|
| CM3 Module A | 0 … 1 bar | Low-pressure sensors, differential pressure applications |
| CM3 Module B | 0 … 70 bar | Pressure transmitters, process instrumentation |
Both pressure ranges remain permanently available. The auto-ranging system automatically determines which control module is best suited for the current calibration point.
Automatic Selection of the Optimal Pressure Range
During calibration, the PACE6000E continuously analyzes the current setpoint. The system then automatically selects the control module that offers the best resolution and the lowest measurement uncertainty for the required pressure.
| Calibration Point | Automatically Selected Module |
|---|---|
| 0.1 bar | CM3 Module 0 … 1 bar |
| 0.5 bar | CM3 Module 0 … 1 bar |
| 5 bar | CM3 Module 0 … 70 bar |
| 20 bar | CM3 Module 0 … 70 bar |
| 50 bar | CM3 Module 0 … 70 bar |
The transition between pressure ranges takes place automatically. For the operator, the entire calibration process remains seamless and uninterrupted.
Why the PACE6000E Is Particularly Well Suited for Auto-Ranging
The PACE6000E was specifically designed for applications requiring high accuracy across a wide range of pressures. By combining dual control modules with optional CM3 modules featuring TERPS technology, the system provides exceptional flexibility and measurement performance.
Instead of relying on a single pressure range, users can install two independently optimized control modules and allow the system to select the most appropriate one automatically.
This approach offers several practical advantages:
- Automatic pressure range selection
- No manual reconfiguration
- Maximum accuracy across a broad pressure range
- Higher productivity in calibration laboratories
- Ideal for automated calibration systems
- Reduced risk of operator errors
Practical Benefits in Calibration Laboratories
A calibration laboratory may receive a wide variety of instruments every day. One moment technicians are calibrating low-pressure sensors in the millibar range, and shortly afterwards they may need to calibrate pressure transmitters operating at several tens of bar.
Without auto-ranging, this often requires either multiple reference pressure controllers or repeated pressure module changes.
With the PACE6000E, both pressure ranges remain permanently available. The controller automatically switches to the most suitable range, allowing technicians to focus on calibration work rather than system reconfiguration.
| Without Auto-Ranging | With PACE6000E Auto-Ranging |
|---|---|
| Multiple reference instruments required | One system covers multiple pressure ranges |
| Frequent module changes | No module changes required |
| Higher setup effort | Fully automatic operation |
| Greater risk of operator error | Automatic range optimization |
| Lower productivity | Higher throughput of devices under test |
This example clearly demonstrates why auto-ranging has become one of the most valuable features of modern pressure controllers and why the PACE6000E is widely used in calibration laboratories, automated test systems, and high-precision pressure calibration applications.
Example: Calibrating from 100 mbar to 70 bar with a Single Instrument
The practical value of auto-ranging becomes particularly apparent when very different pressure ranges must be calibrated within a short period of time. This situation is common in calibration laboratories, testing service providers, and industrial quality assurance departments.
A typical example involves calibrating various pressure instruments throughout the day. One device may have a measuring range of only 100 mbar, while the next pressure transmitter may need to be tested up to 70 bar.
With conventional single-range pressure controllers, users often face two options: either use a large pressure range and sacrifice accuracy at low pressures, or repeatedly switch between different reference instruments or pressure modules.
Auto-ranging eliminates this problem by automatically selecting the most suitable pressure range for each calibration point.
Typical Calibration Tasks Throughout the Day
| Device Under Test | Measuring Range | Optimal Reference Range |
|---|---|---|
| Differential pressure sensor | 0 … 100 mbar | Low-pressure module |
| Pressure transmitter | 0 … 1 bar | 1 bar module |
| Pressure transmitter | 0 … 10 bar | 10 bar module |
| Industrial sensor | 0 … 40 bar | 70 bar module |
| Hydraulic pressure transmitter | 0 … 70 bar | 70 bar module |
Without auto-ranging, these applications would typically require multiple reference systems or frequent replacement of control modules. This leads to additional setup time and interrupts the calibration workflow.
The Solution with the PACE6000E
The PACE6000E Pressure Controller can, for example, be equipped with a 1 bar CM3 module and a 70 bar CM3 module. This configuration covers a large portion of typical calibration tasks with a single instrument.
| Installed Module | Pressure Range |
|---|---|
| CM3 Module A | 0 … 1 bar |
| CM3 Module B | 0 … 70 bar |
During calibration, the auto-ranging system automatically determines which module should be used. The operator does not need to change settings or perform any hardware modifications.
Practical Comparison
| Work Step | Without Auto-Ranging | With Auto-Ranging |
|---|---|---|
| Select pressure range | Manual | Automatic |
| Module replacement | Regularly required | Not required |
| Calibration workflow | Potential interruptions | Continuous operation |
| Operator effort | Higher | Lower |
| Productivity | Limited | Maximized |
Especially when large numbers of instruments are calibrated, the time savings quickly add up to several hours per week. At the same time, the risk of operator errors is reduced because no manual range changes are required.
Particularly Valuable for Automated Calibrations
The greatest benefit is often achieved in automated calibration systems. These systems can process a wide variety of devices under test in sequence without requiring operator intervention.
For example, an automated test bench may calibrate several low-pressure sensors in the morning and then immediately continue with pressure transmitters up to 70 bar. The auto-ranging function of the PACE6000E automatically ensures that the optimal pressure range is used for every calibration point.
This not only reduces calibration time but also improves measurement quality. For this reason, auto-ranging is now considered one of the most important features of modern pressure controllers used in calibration laboratories and automated testing systems.
Advantages of Auto-Ranging in Calibration Laboratories
Calibration laboratories are among the biggest beneficiaries of modern auto-ranging technology. The reason is simple: few environments are required to calibrate such a wide variety of pressure instruments and pressure ranges on a daily basis.
Calibration laboratories frequently receive pressure sensors, pressure transmitters, pressure switches, and digital pressure gauges from many different manufacturers. Measuring ranges can extend from just a few millibars up to several hundred bar. Without auto-ranging, this would often require multiple reference pressure controllers or frequent control module changes.
Modern systems such as the PACE6000E Pressure Controller solve this challenge through automatic pressure range selection. As a result, calibration tasks can be performed more efficiently and with less operator effort.
Higher Accuracy
The most important advantage of auto-ranging is improved measurement performance across a wide pressure range.
Because the system automatically uses the pressure range with the best available resolution, it always operates under optimal measurement conditions. The user no longer needs to determine which pressure range offers the lowest measurement uncertainty.
| Calibration Point | Automatically Selected Range | Result |
|---|---|---|
| 0.2 bar | 0 … 1 bar | Maximum resolution |
| 0.8 bar | 0 … 1 bar | Optimal accuracy |
| 20 bar | 0 … 70 bar | Optimal measurement uncertainty |
| 50 bar | 0 … 70 bar | High accuracy |
This enables highly accurate calibrations to be performed across a very wide pressure range.
Reduced Setup Time
In many laboratories, valuable working time is lost every day due to pressure module changes or switching between different reference systems.
Auto-ranging significantly reduces this effort because multiple pressure ranges are available simultaneously. Switching between ranges is performed automatically by the pressure controller.
| Work Step | Without Auto-Ranging | With Auto-Ranging |
|---|---|---|
| Module replacement | Regularly required | Not required |
| System reconfiguration | Sometimes necessary | Eliminated |
| Calibration interruptions | Frequent | Minimal |
Especially when large numbers of instruments are calibrated, these time savings become highly significant.
Faster Calibration Procedures
Since no reconfiguration is required, calibration programs can be executed without interruption.
Automated calibration systems particularly benefit from this capability. A single test sequence can calibrate different pressure instruments one after another without requiring any operator intervention.
- Reduced downtime
- Higher throughput of devices under test
- Shorter calibration times
- Better utilization of calibration stations
Reduction of Operator Errors
Every manual intervention introduces the possibility of human error. Incorrect range selection, forgotten module changes, or configuration mistakes can affect calibration quality.
Auto-ranging significantly reduces these risks because pressure range selection is fully automated.
| Potential Source of Error | With Auto-Ranging |
|---|---|
| Incorrect pressure range selected | Automatically prevented |
| Module change forgotten | Not applicable |
| Configuration errors | Reduced |
| Operator influence | Minimized |
This improves process reliability and increases the consistency of calibration results.
Higher Productivity
The combination of improved accuracy, reduced setup time, and automatic range selection ultimately results in significantly higher productivity.
Many calibration laboratories can process more instruments per day without hiring additional personnel or purchasing additional reference systems.
| Benefit | Impact in the Calibration Laboratory |
|---|---|
| Auto-Ranging | Reduced setup time |
| Automatic range selection | Faster workflows |
| Optimal pressure ranges | Higher accuracy |
| Reduced operator intervention | Greater process reliability |
| Continuous calibration workflows | More instruments calibrated per day |
For these reasons, auto-ranging has become one of the most important features of modern reference pressure controllers and is a key productivity factor for calibration laboratories and automated testing systems. Systems such as the PACE6000E demonstrate how multiple pressure ranges can be combined efficiently while maintaining exceptional measurement performance.
Auto-Ranging in Automated Test Benches
While auto-ranging already offers significant benefits in calibration laboratories, its full potential often becomes apparent in automated test benches. In these environments, testing procedures frequently run automatically for many hours. Any manual intervention would reduce the efficiency of the entire system.
For this reason, automatic pressure range selection has become one of the most important features of modern pressure controllers used in automated applications.
Many test benches are required to evaluate different products across a variety of pressure ranges. These may include pressure sensors, pressure transmitters, valves, pumps, hydraulic components, or complete assemblies.
| Typical Device Under Test | Test Pressure |
|---|---|
| Differential pressure sensor | 100 mbar |
| Process pressure sensor | 1 bar |
| Pressure transmitter | 10 bar |
| Hydraulic pressure sensor | 70 bar |
| Test bench component | Variable pressure ranges |
Without auto-ranging, test programs would need to be interrupted whenever a different pressure range is required. This would either require operator intervention or the use of additional reference instruments.
With auto-ranging, the pressure controller performs this task automatically. The user simply creates the test sequence, while the system independently selects the pressure range that is best suited for each test step.
Continuous Automation
The greatest advantage of auto-ranging is that testing procedures can be performed without interruption.
An automated test bench may, for example, carry out the following sequence of tests:
- Leak test at 200 mbar
- Functional test at 1 bar
- Load test at 10 bar
- Pressure strength test at 50 bar
With an auto-ranging system such as the PACE6000E, the selection of the optimal pressure range takes place automatically. The entire testing sequence runs without operator intervention.
| Test Step | Required Pressure | Automatically Selected Range |
|---|---|---|
| Leak Test | 0.2 bar | 0 … 1 bar |
| Functional Test | 1 bar | 0 … 1 bar |
| Load Test | 10 bar | 0 … 70 bar |
| Pressure Strength Test | 50 bar | 0 … 70 bar |
Reduced Downtime
In production environments, downtime results in direct costs. Every interruption of a test bench reduces throughput and increases testing costs per component.
Auto-ranging allows test programs to run continuously without unnecessary interruptions.
- No manual switching
- No module replacement
- No interruption of the test sequence
- Higher system availability
- More devices tested per shift
This significantly improves the overall efficiency of the testing system.
Improved Process Reliability
Automated test benches are designed to deliver highly reproducible results. Every manual intervention represents a potential source of error.
Auto-ranging reduces the number of manual interactions and ensures that the optimal pressure range is always used automatically.
| Manual Range Selection | Auto-Ranging |
|---|---|
| Operator decides | System decides automatically |
| Operator errors possible | Error sources reduced |
| Dependent on personnel | Standardized procedures |
| Results may vary | High repeatability |
This is particularly valuable in quality-critical industries such as aerospace, automotive manufacturing, and medical technology.
Why the PACE6000E Is Particularly Suitable for Automated Test Benches
The PACE6000E Pressure Controller combines auto-ranging with several additional features that are highly beneficial for automated applications:
- Two independent control modules
- Fast pressure control performance
- SCPI support for automation systems
- Ethernet, USB, and RS232 interfaces
- CM3 control modules with TERPS technology
- Excellent long-term stability
As a result, the system is ideally suited not only for calibration laboratories but also for sophisticated production test benches and automated testing systems where different pressure ranges must be processed efficiently and with high accuracy.
Auto-Ranging and Measurement Uncertainty
When discussing the performance of a pressure controller, accuracy is often the first specification that comes to mind. However, for calibration laboratories and accredited testing facilities, measurement uncertainty is usually the most important parameter.
Measurement uncertainty describes the range within which the true value is expected to lie. It therefore plays a central role in every calibration procedure and directly influences the quality of the calibration result.
This is precisely where auto-ranging provides one of its greatest advantages. By automatically selecting the optimal pressure range, the system ensures that every measurement is performed using the control module that offers the lowest possible uncertainty for the current pressure point.
Why Measurement Uncertainty Depends on the Pressure Range
The accuracy of a pressure controller is generally specified as a percentage of the measurement range. Consequently, the relationship between the selected pressure range and the actual calibration pressure has a direct impact on the achievable uncertainty.
Low-pressure measurements should therefore be performed using a low-pressure module whenever possible, while higher pressures require an appropriately larger pressure range.
| Calibration Pressure | Optimal Pressure Range | Measurement Uncertainty |
|---|---|---|
| 100 mbar | 0 … 1 bar | Very low |
| 500 mbar | 0 … 1 bar | Very low |
| 10 bar | 0 … 70 bar | Low |
| 50 bar | 0 … 70 bar | Optimal |
If a large pressure range were used for every measurement, smaller pressure values would often be associated with a higher measurement uncertainty.
Auto-Ranging as an Automatic Accuracy Optimizer
Auto-ranging ensures that the pressure range delivering the highest resolution and lowest uncertainty is always selected automatically.
The user no longer needs to calculate which control module is best suited for a particular calibration point. The system performs this task automatically.
- Optimal utilization of every control module
- Automatic selection of the best measurement performance
- Consistent calibration quality
- Reduced risk of operator errors
- Improved comparability of calibration results
This benefit becomes especially important in automated calibration systems that process many different devices under test.
Practical Example from a Calibration Laboratory
A calibration laboratory calibrates both low-pressure sensors with measuring ranges around 250 mbar and process pressure transmitters up to 70 bar on the same day.
Without auto-ranging, technicians would either need multiple reference systems or repeatedly change control modules. Both approaches consume time and increase the possibility of operator errors.
A PACE6000E Pressure Controller equipped with two CM3 control modules can handle these tasks automatically. The system uses the low-pressure module for small pressure values and the high-pressure module for higher pressures.
| Calibration Task | Automatically Selected Module |
|---|---|
| 250 mbar sensor | 0 … 1 bar CM3 |
| 1 bar pressure transmitter | 0 … 1 bar CM3 |
| 25 bar pressure transmitter | 0 … 70 bar CM3 |
| 70 bar pressure transmitter | 0 … 70 bar CM3 |
This ensures optimal measurement performance across the entire operating range without requiring any user intervention.
Why This Matters for Accredited Calibrations
In calibration laboratories accredited according to ISO/IEC 17025, measurement uncertainty is a key performance indicator. The lower the uncertainty of the reference system, the more accurately the actual deviation of the device under test can be determined.
Auto-ranging helps maximize the performance of the available reference equipment and ensures that calibrations are always performed under the most favorable measurement conditions.
| Benefit of Auto-Ranging | Impact |
|---|---|
| Optimal pressure range selection | Lower measurement uncertainty |
| Automatic range switching | Reduced operator errors |
| Higher resolution | More precise calibrations |
| Consistent testing conditions | Improved repeatability |
| More efficient workflows | Higher throughput |
For this reason, auto-ranging is much more than a convenience feature. It is an important component of modern calibration technology and plays a major role in minimizing measurement uncertainty across a wide pressure range.
Which Pressure Ranges Can Be Combined Effectively?
The performance of an auto-ranging system depends heavily on the selected pressure ranges. As a general rule, the better the installed control modules match the laboratory’s typical calibration tasks, the greater the benefits of auto-ranging.
Modern pressure controllers such as the PACE6000E allow two different CM or CM3 control modules to be installed simultaneously. This makes it possible to cover both low-pressure and high-pressure applications using a single instrument.
The Ideal Combination Depends on the Application
There is no universal combination that is perfect for every application. The most effective setup depends on the pressure instruments that are calibrated most frequently.
| Application | Recommended Module Combination |
|---|---|
| General calibration laboratory | 0 … 1 bar + 0 … 70 bar |
| Process industry | 0 … 2 bar + 0 … 20 bar |
| Hydraulic applications | 0 … 20 bar + 0 … 210 bar |
| Low-pressure applications | 0 … 100 mbar + 0 … 1 bar |
| Research and development | Application-specific |
One of the most common configurations in calibration laboratories combines a low-pressure module with a high-pressure module. This setup allows a large proportion of industrial pressure sensors and transmitters to be calibrated efficiently using a single pressure controller.
Why Large Overlaps Are Often Less Effective
Some users consider combining two pressure ranges that are very similar. In practice, however, this often provides only limited benefits.
| Less Effective Combination | More Effective Combination |
|---|---|
| 0 … 10 bar + 0 … 20 bar | 0 … 1 bar + 0 … 70 bar |
| 0 … 20 bar + 0 … 35 bar | 0 … 2 bar + 0 … 100 bar |
| 0 … 70 bar + 0 … 100 bar | 0 … 100 mbar + 0 … 10 bar |
In most cases, the greater the difference between the installed pressure ranges, the greater the benefit provided by auto-ranging.
A Typical Configuration for Calibration Laboratories
One of the most popular configurations for the PACE6000E consists of:
- CM3 control module 0 … 1 bar
- CM3 control module 0 … 70 bar
This combination covers a large proportion of typical calibration tasks while maintaining excellent accuracy at low pressure values.
| Device Under Test | Automatically Selected Range |
|---|---|
| Differential pressure sensor 100 mbar | 0 … 1 bar |
| Pressure transmitter 600 mbar | 0 … 1 bar |
| Process pressure sensor 10 bar | 0 … 70 bar |
| Industrial sensor 40 bar | 0 … 70 bar |
| Hydraulic pressure transmitter 70 bar | 0 … 70 bar |
The user benefits from the performance of two specialized reference systems without the need to operate multiple pressure controllers or exchange control modules.
When More Than Two Pressure Ranges Are Required
In most industrial applications, two carefully selected pressure ranges are entirely sufficient. However, there are specialized applications where extremely low pressures and very high pressures must be calibrated within the same facility.
In these cases, multiple reference systems or additional pressure controllers may still be required. For the vast majority of calibration tasks, however, the dual-channel architecture of the PACE6000E provides more than enough flexibility.
- Calibration laboratories
- In-house calibration facilities
- Calibration service providers
- Automated test benches
- Research and development departments
- Quality assurance laboratories
Choosing the correct pressure ranges is therefore one of the most important factors in maximizing the effectiveness of an auto-ranging system. Organizations that understand the typical pressure ranges of their devices under test can often cover the majority of calibration tasks with a single pressure controller.
CM and CM3 Control Modules as the Foundation of Auto-Ranging
Auto-ranging can only function effectively when multiple suitable pressure ranges are available within a single system. This is where Druck’s CM and CM3 control modules play a central role. They form the technological foundation of flexible pressure control within the PACE6000E Pressure Controller.
The control modules contain both the pressure sensing technology and the complete pressure control system. This allows the pressure controller to be tailored precisely to the intended application. Different module variants are available depending on the required pressure range, accuracy level, and budget.
One major advantage of the PACE platform is that many existing control modules can continue to be used. This provides excellent investment protection while maintaining flexibility for future expansion.
A detailed overview of available systems, control modules, and configuration options can be found here:
PACE5000E & PACE6000E – Modular Precision Pressure Controller Overview
What Is the Difference Between CM and CM3 Control Modules?
Both module types provide highly precise pressure control. However, CM3 modules have been specifically designed for applications requiring the highest accuracy and the lowest possible measurement uncertainty.
| Feature | CM Module | CM3 Module |
|---|---|---|
| Pressure Control | Yes | Yes |
| Auto-Ranging Compatible | Yes | Yes |
| TERPS Technology | No | Yes |
| Long-Term Stability | Very good | Outstanding |
| Measurement Uncertainty | Low | Exceptionally low |
| Typical Application | Industrial and production environments | Calibration laboratories and reference measurements |
For many industrial testing applications, standard CM control modules already provide excellent performance. However, users requiring reference-level calibration capabilities or the lowest possible measurement uncertainties often choose CM3 modules.
Why Multiple Control Modules Are Required for Auto-Ranging
The true strength of auto-ranging only becomes apparent when multiple pressure ranges are available within a single system. The pressure controller can then automatically switch between installed modules and always select the range offering the best resolution and measurement performance.
A typical PACE6000E configuration may look like this:
| Control Module | Pressure Range | Typical Application |
|---|---|---|
| CM3 Module A | 0 … 1 bar | Low-pressure sensors and differential pressure measurements |
| CM3 Module B | 0 … 70 bar | Process pressure transmitters and industrial sensors |
With this configuration, a large number of calibration tasks can be completed without any system modifications. The auto-ranging function automatically determines which module provides the best measurement performance for each calibration point.
Advantages of the Modular Architecture
- Flexible adaptation to different applications
- Investment protection through interchangeable modules
- Ideal foundation for auto-ranging functionality
- Wide selection of available pressure ranges
- Excellent long-term flexibility
- Custom configuration possibilities
This modular architecture is one of the key reasons why auto-ranging can be implemented so effectively in practice. Users gain the performance advantages of multiple specialized reference systems without needing to operate several pressure controllers.
TERPS Technology and Its Importance for Auto-Ranging
The performance of an auto-ranging system is not determined solely by the number of available pressure ranges. The quality of the pressure sensors integrated into the control modules is equally important. This is where TERPS technology plays a critical role, as it forms the basis of Druck’s high-precision CM3 control modules.
TERPS stands for Trench Etched Resonant Pressure Sensor. Developed by Druck, this sensor technology is regarded as one of the most precise pressure measurement methods available for industrial and metrological applications.
While many conventional pressure sensors detect pressure changes through resistance variations, TERPS technology relies on highly accurate resonance frequency measurements. Since frequencies can be measured with exceptional precision, the resulting pressure readings are extremely stable and highly reproducible.
Further information about the PACE platform and available CM3 control modules can be found here:
PACE5000E & PACE6000E – Modular Precision Pressure Controller Overview
Why TERPS Technology Complements Auto-Ranging Perfectly
Auto-ranging ensures that the most suitable pressure range is selected automatically. TERPS technology ensures that the highest possible measurement performance is achieved within that pressure range.
As a result, both technologies complement each other perfectly:
| Auto-Ranging | TERPS Technology |
|---|---|
| Selects the optimal pressure range | Maximizes accuracy within the selected range |
| Reduces setup times | Reduces measurement uncertainty |
| Automates range selection | Improves measurement quality |
| Increases productivity | Enhances measurement confidence |
The result is a pressure control system that combines exceptional flexibility with outstanding precision.
Benefits of TERPS Sensors
TERPS sensors demonstrate their strengths particularly well in calibration applications. Even extremely small pressure changes can be detected reliably and consistently.
- Exceptional resolution
- Very low hysteresis
- Excellent repeatability
- Outstanding temperature stability
- Minimal long-term drift
- Extremely low measurement uncertainty
This makes TERPS-based CM3 modules particularly suitable for reference measurements, accredited calibrations, and demanding testing applications.
The Impact on Measurement Uncertainty
Measurement uncertainty plays a particularly important role in auto-ranging applications. Automatic pressure range selection is only truly beneficial if every available pressure range delivers a correspondingly high level of measurement performance.
By combining auto-ranging with TERPS technology, the PACE6000E Pressure Controller can provide exceptional accuracy across a very wide pressure range.
| Feature | Benefit for Auto-Ranging |
|---|---|
| High Resolution | Precise low-pressure measurements |
| Low Hysteresis | Highly reproducible results |
| Long-Term Stability | Reduced recalibration frequency |
| Temperature Stability | Consistent measurement accuracy |
| Low Measurement Uncertainty | Optimal reference measurements |
Practical Example
A calibration laboratory operates a PACE6000E equipped with a 1 bar CM3 module and a 70 bar CM3 module. The auto-ranging system automatically determines which module should be used for each calibration point.
Thanks to TERPS technology, the system not only selects the optimal pressure range but also provides the highest possible measurement quality within that range.
This gives the user two key advantages:
- Automatic selection of the most suitable pressure range
- Maximum accuracy within that pressure range
This combination is one of the reasons why modern pressure controllers such as the PACE6000E are widely used in calibration laboratories, testing service providers, and demanding industrial applications.
When Is Auto-Ranging Most Beneficial?
Auto-ranging is not essential for every application. Organizations that only calibrate a single pressure range and perform relatively few calibrations each week can often work effectively with a traditional single-channel pressure controller.
However, whenever multiple pressure ranges must be covered regularly or when high demands are placed on efficiency and measurement quality, auto-ranging delivers significant advantages.
Modern pressure controllers such as the PACE6000E were specifically developed for these types of applications. By combining dual control modules, auto-ranging functionality, and optional CM3 modules with TERPS technology, a single system can efficiently handle a broad range of calibration tasks.
Calibration Laboratories
Calibration laboratories are often among the greatest beneficiaries of auto-ranging technology. Every day, they must calibrate devices covering a wide variety of pressure ranges.
| Typical Device Under Test | Measuring Range |
|---|---|
| Differential pressure sensor | 100 mbar |
| Pressure transmitter | 1 bar |
| Process pressure sensor | 16 bar |
| Industrial pressure transmitter | 70 bar |
Without auto-ranging, multiple reference systems or frequent module changes would often be required. With an auto-ranging system, all of these calibrations can be performed more efficiently using a single platform.
In-House Calibration and Quality Assurance
Many manufacturing companies operate their own calibration stations or quality assurance departments. These facilities routinely verify pressure instruments before shipment or installation.
Since the devices under test often cover different pressure ranges, auto-ranging significantly reduces setup effort.
- Reduced setup times
- Faster testing procedures
- Higher productivity
- Consistent testing conditions
Calibration Service Providers
External calibration service providers must be particularly flexible because customer requirements change from day to day.
One day may begin with low-pressure sensors and end with high-pressure transmitters. Auto-ranging makes it possible to handle these varying tasks efficiently using a single pressure controller.
| Without Auto-Ranging | With Auto-Ranging |
|---|---|
| Multiple reference instruments required | One system covers multiple pressure ranges |
| Frequent reconfiguration | No reconfiguration required |
| Higher workload | Faster calibration process |
Automated Test Benches
Auto-ranging can also provide significant advantages in automated test benches. Different test sequences often require different pressure ranges.
The pressure controller automatically selects the appropriate range and enables fully automated testing procedures without operator intervention.
- No manual intervention required
- Continuous test sequences
- Higher system availability
- Reduced risk of operator errors
Research and Development
In research and development environments, testing requirements frequently change. New products, prototypes, and test setups often require different pressure ranges within a short period of time.
An auto-ranging system offers maximum flexibility in these situations, allowing new test procedures to be implemented without additional hardware modifications.
This flexibility is one of the reasons why advanced pressure controllers such as the PACE6000E are frequently used in development laboratories and engineering departments.
When Auto-Ranging May Be Less Beneficial
There are also applications where auto-ranging offers only limited advantages.
| Application | Benefit of Auto-Ranging |
|---|---|
| Always the same pressure range | Low |
| Only a few calibrations per month | Low |
| No automation planned | Moderate |
| Frequent use of multiple pressure ranges | Very high |
| Automated testing procedures | Very high |
If a laboratory exclusively calibrates pressure instruments within a single pressure range, a traditional single-channel pressure controller may often be sufficient.
However, as soon as different pressure ranges are used regularly, the benefits of auto-ranging become increasingly significant.
Summary
Auto-ranging is particularly valuable whenever multiple pressure ranges must be covered efficiently, when high accuracy is required, or when calibration and testing procedures need to be automated.
This is why the technology is now widely used in calibration laboratories, testing service providers, quality assurance departments, research facilities, and automated test systems.
Modern systems such as the PACE6000E Pressure Controller demonstrate how flexibility, productivity, and measurement quality can be successfully combined within a single platform.
Auto-Ranging vs. Multiple Individual Pressure Controllers
Organizations that regularly calibrate different pressure ranges often face a fundamental decision: should they invest in several specialized pressure controllers, or would an auto-ranging system provide a more efficient and economical solution?
Both approaches have their advantages. While multiple dedicated pressure controllers offer maximum specialization, auto-ranging provides exceptional flexibility with significantly lower operating effort.
Modern systems such as the PACE6000E Pressure Controller have been designed specifically to combine the advantages of multiple pressure ranges within a single instrument.
The Traditional Approach: Multiple Reference Pressure Controllers
Historically, many calibration laboratories operated several pressure controllers covering different pressure ranges. One reference system would be used for low-pressure applications, while another would be dedicated to higher pressure calibrations.
Although this approach can deliver excellent measurement performance, it also increases complexity, investment costs, and maintenance requirements.
| Advantages | Disadvantages |
|---|---|
| Optimized for a specific pressure range | Higher investment costs |
| Dedicated reference systems | Greater space requirements |
| Maximum specialization | Higher maintenance effort |
| Well-established concept | More complex operation |
The Modern Approach: Auto-Ranging
With auto-ranging, multiple pressure ranges are available within a single pressure controller. The system automatically selects the pressure range that provides the best measurement performance for the current calibration point.
This allows a wide variety of calibration tasks to be performed efficiently using just one instrument.
| Advantages | Disadvantages |
|---|---|
| One system covers multiple pressure ranges | Not every highly specialized application can be covered |
| Automatic pressure range selection | Requires a suitable module configuration |
| Reduced operator effort | Higher initial investment than a basic single-range controller |
| Improved productivity | – |
Comparison in Daily Calibration Work
The differences become especially clear when pressure instruments with varying measuring ranges must be calibrated throughout the day.
| Criterion | Multiple Individual Controllers | Auto-Ranging System |
|---|---|---|
| Number of instruments | Several | One system |
| Space requirements | Higher | Lower |
| Training effort | Higher | Lower |
| Automation capability | Limited | Excellent |
| Productivity | Moderate | High |
| Flexibility | Good | Very high |
When Multiple Individual Controllers May Still Make Sense
There are situations where operating several dedicated reference pressure controllers remains a practical solution.
- Extremely wide differences between required pressure ranges
- Highly specialized accredited calibration tasks
- Multiple calibration stations operating simultaneously
- Existing laboratory infrastructures built around dedicated systems
However, for the majority of industrial calibration applications, the advantages of a modern auto-ranging system typically outweigh these considerations.
Practical Example
A calibration laboratory routinely calibrates pressure sensors ranging from 250 mbar up to 70 bar. Previously, two separate reference pressure controllers were required to cover these applications.
After implementing a PACE6000E equipped with two CM3 control modules, both pressure ranges could be combined within a single system.
| Before | After |
|---|---|
| 2 reference pressure controllers | 1 PACE6000E |
| Manual range selection | Auto-ranging |
| Higher training effort | Unified operation |
| More space required | Compact system design |
| Higher complexity | Simplified workflows |
Conclusion
Multiple individual pressure controllers can still be appropriate for certain highly specialized applications. For most calibration laboratories, testing service providers, and automated test systems, however, auto-ranging offers substantial operational advantages.
Automatic selection of the optimal pressure range reduces setup times, improves productivity, and simplifies calibration workflows. This is why auto-ranging has become a defining feature of modern precision pressure controllers.
Systems such as the PACE6000E demonstrate how multiple pressure ranges can be integrated efficiently into a single reference system while maintaining exceptional measurement performance.
Practical Example: How Auto-Ranging Can Reduce Calibration Time by Several Hours per Week
The benefits of auto-ranging are not merely theoretical. They can be observed directly in day-to-day calibration operations. Organizations with high calibration volumes often benefit from shorter setup times, fewer operator interventions, and better utilization of calibration resources.
Many calibration laboratories process a wide variety of pressure instruments every day. These may range from low-pressure sensors to industrial pressure transmitters and high-pressure measurement devices.
Without auto-ranging, technicians must frequently switch between reference systems or replace pressure modules. Each of these actions consumes valuable time and interrupts the calibration workflow.
Initial Situation
A calibration laboratory processes approximately 40 pressure instruments per day covering a wide range of measuring ranges.
| Device Under Test Type | Typical Measuring Range |
|---|---|
| Differential pressure sensors | 100 mbar to 500 mbar |
| Process pressure sensors | 1 to 10 bar |
| Pressure transmitters | 10 to 40 bar |
| Industrial pressure sensors | 40 to 70 bar |
Before implementing an auto-ranging system, the laboratory relied on two separate reference pressure controllers. Depending on the device under test, technicians had to select the appropriate reference system or reconfigure the calibration station.
Typical Time Losses Without Auto-Ranging
| Activity | Time Required per Occurrence |
|---|---|
| Switching reference instruments | 2 to 5 minutes |
| Reconfiguring the calibration station | 1 to 3 minutes |
| Functional verification after reconfiguration | 1 to 2 minutes |
| Documentation adjustments | Approximately 1 minute |
Even a few pressure range changes per day can therefore result in a significant loss of productive working time.
With ten reconfigurations per day, for example, it is easy to accumulate 30 to 60 minutes of additional effort.
The Solution with Auto-Ranging
After upgrading to a PACE6000E Pressure Controller equipped with two installed CM3 control modules, all required pressure ranges became permanently available.
| Control Module | Pressure Range |
|---|---|
| CM3 Module A | 0 … 1 bar |
| CM3 Module B | 0 … 70 bar |
The auto-ranging system now automatically determines which module provides the highest accuracy for each calibration point.
The operator no longer needs to switch instruments or replace pressure modules.
Results After Implementation
| Criterion | Before | After |
|---|---|---|
| Reference systems | 2 instruments | 1 PACE6000E |
| Manual range changes | Frequent | None |
| Calibration interruptions | Several times per day | Virtually eliminated |
| Productivity | Good | Significantly higher |
| Operator errors | Possible | Reduced |
Depending on the number of calibration tasks performed, several hours of labor can be saved every week.
Additional Benefits
In addition to direct time savings, several other positive effects are achieved:
- Consistent operation across all pressure ranges
- Reduced training requirements
- Higher utilization of calibration stations
- Lower probability of operator errors
- Improved repeatability of calibration results
- Simplified automation of calibration procedures
Particularly in laboratories processing large numbers of pressure instruments, auto-ranging can make a meaningful contribution to reducing operating costs.
This practical example demonstrates that auto-ranging is far more than a convenience feature. By combining greater efficiency, reduced setup times, and optimal utilization of available pressure ranges, the technology contributes directly to the economic performance of modern calibration operations.
Conclusion: Why Auto-Ranging Has Become a Standard Feature of Modern Pressure Controllers
The demands placed on modern calibration and testing systems continue to increase. Today, users expect not only high accuracy but also fast testing procedures, simple operation, and maximum flexibility. This is precisely why auto-ranging has become one of the most important features of modern pressure controllers.
By automatically selecting the optimal pressure range, calibrations become more efficient, more accurate, and significantly easier to perform. Users no longer need to determine which pressure range should be used because the pressure controller handles this task automatically.
Particularly in calibration laboratories, testing service organizations, research facilities, and automated test systems, auto-ranging provides substantial benefits. Different pressure ranges can be used without reconfiguration, allowing testing procedures to be completed faster while reducing the likelihood of operator errors.
| Benefit of Auto-Ranging | Advantage for the User |
|---|---|
| Automatic pressure range selection | Simplified operation |
| Optimal pressure ranges | Higher accuracy |
| No module replacement required | Reduced setup times |
| Automatic range switching | Higher productivity |
| Reduced operator errors | Improved process reliability |
| Better utilization of testing resources | Lower operating costs |
Modern systems such as the PACE6000E Precision Pressure Controller demonstrate how effectively auto-ranging can be implemented in practice. By combining two control modules, automatic range selection, and optional CM3 modules with TERPS technology, the result is a highly flexible and exceptionally capable calibration system.
Especially in applications involving frequently changing pressure ranges, auto-ranging can significantly improve productivity while simultaneously reducing measurement uncertainty. For many calibration laboratories and testing facilities, this translates directly into improved operational efficiency.
The key conclusion is therefore clear: auto-ranging is no longer simply a convenience feature. It is a fundamental component of modern calibration technology and plays a crucial role in combining precision, efficiency, and automation at the highest level.
Organizations that regularly calibrate different pressure ranges or operate automated testing systems should therefore evaluate whether an auto-ranging-capable solution such as the PACE6000E is the right choice for their requirements.
Frequently Asked Questions About Auto-Ranging in Pressure Controllers
What does auto-ranging mean in a pressure controller?
Auto-ranging refers to the automatic selection of the optimal pressure range within a pressure controller. The system independently determines which installed control module provides the highest accuracy and lowest measurement uncertainty for the current calibration task.
What are the advantages of auto-ranging?
Auto-ranging reduces setup times, improves measurement accuracy across a wide pressure range, minimizes operator errors, and increases the productivity of calibration laboratories and testing systems.
Does auto-ranging improve accuracy?
Yes. Because the controller automatically selects the pressure range with the best available resolution, measurement uncertainty can often be reduced, particularly at lower pressure values. This enables more accurate calibrations.
Does auto-ranging require special pressure modules?
Yes. Auto-ranging requires multiple pressure ranges to be available within a single system. In the PACE6000E, this is achieved through the use of different CM or CM3 control modules.
How many pressure ranges can be used simultaneously?
The PACE6000E can be equipped with two independent control modules, making two different pressure ranges available at the same time.
Can auto-ranging eliminate manual module changes?
In many applications, yes. As long as the required pressure ranges are covered by the installed control modules, switching between ranges is performed automatically without operator intervention.
Is auto-ranging only useful for calibration laboratories?
No. Production test benches, in-house calibration facilities, research laboratories, testing service providers, and quality assurance departments can also benefit significantly from automatic pressure range selection.
What role do CM3 control modules play?
CM3 modules incorporate high-precision TERPS sensor technology and provide exceptionally low measurement uncertainty. This makes them particularly well suited for demanding auto-ranging applications.
What is the difference between CM and CM3 control modules?
CM modules already offer highly accurate pressure control for industrial applications. CM3 modules additionally incorporate TERPS technology, providing even higher accuracy, better long-term stability, and lower hysteresis.
What does TERPS stand for?
TERPS stands for Trench Etched Resonant Pressure Sensor. This sensor technology developed by Druck is considered one of the most precise pressure measurement methods available for industrial calibration and testing applications.
Can auto-ranging reduce measurement uncertainty?
Yes. By automatically selecting the optimal pressure range, the system ensures that the lowest achievable measurement uncertainty is maintained across a broad operating range.
Is auto-ranging beneficial for automated test benches?
Absolutely. Auto-ranging enables fully automated testing procedures because pressure ranges can be switched automatically without operator intervention.
Which pressure ranges can be combined?
The possible combinations depend on the available CM and CM3 control modules. A common configuration combines a low-pressure module such as 0 … 1 bar with a higher-pressure module such as 0 … 70 bar.
Can existing control modules continue to be used?
Many compatible existing PACE control modules can continue to be used, providing a high level of investment protection.
Which Druck pressure controller supports auto-ranging?
The PACE6000E has been specifically designed for applications involving multiple pressure ranges and offers a powerful auto-ranging capability through its dual-channel architecture.
Does the PACE5000E also support auto-ranging?
The PACE5000E is a single-channel precision pressure controller. While it is an excellent solution for many calibration applications, combining multiple pressure ranges automatically is a key advantage of the dual-channel PACE6000E.
When does auto-ranging provide the greatest economic benefit?
Auto-ranging offers the greatest return when pressure ranges change frequently, large numbers of instruments are calibrated, or testing procedures are highly automated.
Can auto-ranging reduce operator errors?
Yes. Because pressure range selection is fully automatic, the risk of selecting an incorrect range or forgetting a required module change is significantly reduced.
Why is auto-ranging becoming increasingly popular?
Because calibration and testing procedures are becoming more automated. Auto-ranging supports this trend by making calibrations faster, more efficient, and more repeatable.
Where can I find additional information about the PACE5000E, PACE6000E, and available control modules?
A comprehensive overview of the pressure controllers, available CM and CM3 control modules, and configuration options can be found here:
PACE5000E & PACE6000E – Modular Precision Pressure Controller Overview