Calibrating an Absolute Pressure Sensor with a Gauge Pressure Reference: Correctly Applying Barometric Correction

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An absolute pressure sensor is to be tested at 6 bar absolute. However, only a high-accuracy gauge pressure reference is available. Can it still be used for calibration?

In principle, yes – provided that the current atmospheric pressure is also measured reliably and taken into account correctly. This is because absolute pressure and gauge pressure differ exactly by the ambient atmospheric pressure:

pabs = prel + patm

If the gauge pressure reference indicates, for example:

5.0000 bar

and the simultaneously measured atmospheric pressure is:

0.9872 bar absolute

then the absolute pressure applied to the device under test is:

5.9872 bar absolute

.

The calculation itself is simple. However, a reliable calibration requires several additional factors to be considered. Particularly important are the accuracy and traceability of the barometer, simultaneous acquisition of both measurements, height differences between the barometer and the device under test, pressure stability, temperature, and whether the absolute pressure is measured directly or calculated from two separate measured quantities.

When calibrating an absolute pressure sensor using a gauge pressure reference, the reference is not a single instrument but a measurement chain consisting of gauge pressure measurement and barometric pressure measurement. The uncertainties of both quantities influence the resulting absolute pressure.

For such applications, ICS Schneider offers various solutions from the Calibration Technology portfolio. The Druck DPI610E features an integrated barometer in its pneumatic versions and can convert gauge pressure measurements into so-called pseudo-absolute pressure measurements. For laboratory and test bench applications, the PACE5000E High-Precision Pressure Controller with barometric option is another suitable solution.

Correctly distinguishing between absolute pressure and gauge pressure

The most important aspect of this calibration task is the pressure reference.

Absolute pressure

is referenced to an ideal vacuum:

0 bar absolute = complete vacuum

Normal atmospheric pressure is therefore approximately:

1 bar absolute

Gauge pressure

is referenced to the current atmospheric pressure.

A gauge pressure instrument with its pressure connection open to the atmosphere indicates:

0 bar gauge

.

At the same time, however, the actual absolute pressure is approximately:

1 bar absolute

This means that the following can apply simultaneously

0 bar gauge ≈ 1 bar absolute

The exact difference is the current local atmospheric pressure.

Why p_abs = p_rel + p_atm applies

Gauge pressure describes the difference between process pressure and atmospheric pressure:

prel = pabs − patm

Rearranging for absolute pressure gives:

pabs = prel + patm

Where:

• pabs = absolute pressure at the device under test,
• prel = pressure measured by the gauge pressure reference,
• patm = current atmospheric absolute pressure.

The decisive point is

that the atmospheric pressure must actually be measured.

It must not simply be assumed to be a fixed standard value.

Test setup for calibration

A typical setup consists of:

• pressure generation system or pressure controller,
• gauge pressure reference,
• absolute pressure sensor as the device under test,
• barometer or barometric absolute pressure reference,
• common pressure volume or manifold,
• electrical supply and signal measurement for the device under test, if required.

Gauge pressure reference and device under test

are connected to the same test pressure.

The barometer is not exposed to this pressure.

It independently measures the current atmospheric absolute pressure.

The absolute pressure is then calculated from the two reference values

Absolute pressure at DUT = gauge pressure reference + atmospheric pressure

This value is compared with the indication or output signal of the absolute pressure sensor.

Calculation example for an absolute pressure sensor

An absolute pressure transmitter with a measuring range of:

0 … 10 bar absolute

is to be tested.

The gauge pressure reference indicates:

4.5000 bar gauge

The barometer simultaneously indicates:

986.4 mbar absolute

or:

0.9864 bar absolute

Calculation

pabs = 4.5000 bar + 0.9864 bar

pabs = 5.4864 bar absolute

The reference value for the absolute pressure sensor is therefore

5.4864 bar absolute

and not:

4.5000 bar

and also not:

5.51325 bar

when using a fixed standard atmospheric pressure.

Converting the desired absolute pressure into gauge pressure

In practice, the calculation is often performed in the opposite direction.

For example, a test point of:

6.0000 bar absolute

is to be generated.

The barometer currently measures:

0.9825 bar absolute

The gauge pressure reference must therefore reach:

prel = pabs − patm

thus:

prel = 6.0000 − 0.9825 bar

prel = 5.0175 bar

The gauge pressure reference must therefore indicate

5.0175 bar gauge

for the absolute pressure at the device under test to be:

6.0000 bar absolute

.

Why 1.01325 bar must not simply be used

The value:

1013.25 hPa

or:

1.01325 bar

describes the defined standard atmospheric pressure.

However, it is not automatically the actual atmospheric pressure at the calibration location.

The actual atmospheric pressure depends, among other things, on

• weather conditions,
• altitude,
• local atmospheric conditions.

At a calibration location, for example:

0.970 bar absolute

or:

1.020 bar absolute

may be present.

If instead a fixed value of:

1.01325 bar

were used, the resulting error would be transferred completely into the calculated absolute pressure.

Weather data is not automatically suitable either

Many publicly reported atmospheric pressure values are reduced to sea level.

For calibration purposes, however, the actual local atmospheric absolute pressure at the measurement location is required.

For barometric correction, a suitable calibrated barometer at the calibration location should therefore be used instead of the pressure value from a weather app.

Requirements for the barometer

In this type of calibration, the barometer becomes part of the reference measurement chain.

Its quality must therefore be suitable for the required measurement uncertainty.

Relevant factors include

• measuring range,
• measurement uncertainty or accuracy,
• long-term stability,
• temperature dependence,
• calibration status,
• resolution,
• measurement rate.

A typical mistake

is to combine a very high-quality gauge pressure reference with a significantly less accurate barometer.

For example:

Gauge pressure reference: uncertainty 0.05 mbar

Barometer: uncertainty 1.0 mbar

In the low-pressure range, the achievable quality of the absolute pressure reference would then effectively be determined by the barometer.

Why barometric pressure and gauge pressure should be recorded simultaneously

Atmospheric pressure is not constant.

It can change during a calibration.

The barometer reading should therefore not simply be:

measured once in the morning

and then used unchanged for a calibration lasting several hours.

A better approach is

to record the atmospheric pressure:

• for every calibration point,
• at short defined intervals, or
• continuously.

In automated calibration systems, the barometric correction can be linked directly to each measurement value.

The time correlation must be clear

Ideally, the following values belong together:

Gauge pressure value

Barometer value

DUT value

Timestamp

This makes it possible to determine later which atmospheric pressure was taken into account at each calibration point.

Height difference between barometer and device under test

Even within a calibration laboratory, atmospheric pressure is not exactly the same at every height.

For small height differences, the pressure change can be approximated by:

Δp ≈ ρair × g × Δh

where:

• ρair = air density,
• g = gravitational acceleration,
• Δh = height difference.

With an air density of approximately 1.2 kg/m³

the approximate result is:

Δp ≈ 12 Pa per meter

or:

≈ 0.12 mbar per meter

This may initially appear insignificant

but it can already be relevant for high-accuracy low-pressure or absolute pressure calibrations.

If the barometer is, for example:

2 m

above the device under test, the local atmospheric pressure difference can be approximately:

0.24 mbar

.

Whether this contribution must be corrected or included as an uncertainty component depends on the required total measurement uncertainty.

Correcting pressure connections to a common reference height

The barometer is not the only component with a specific height position.

Height differences may also exist between:

• reference pressure sensor,
• pressure manifold,
• device under test.

The hydrostatic pressure difference can generally be described by:

Δp = ρ × g × Δh

With gases

this effect is comparatively small because of their low density.

With liquids

it can be significant.

In hydraulic calibrations, even a height difference of only a few centimeters can become relevant when high accuracy is required.

A reference level should therefore be defined for precise calibrations

for example:

height of the pressure connection of the device under test

All reference values can then be corrected to this level.

Pressure stability and stabilization time

A mathematically correct barometric correction is of little use if the actual test pressure has not yet stabilized.

After a pressure change:

• gas volume,
• lines,
• sensors,
• seals,
• temperatures

may first need to stabilize.

In pneumatic systems

rapid compression can heat the gas.

After the pressure has been set, the gas subsequently cools down again and the pressure changes.

A calibration point should therefore only be evaluated

when:

reference pressure is stable

DUT indication is stable

temperature is sufficiently stable

.

A fixed waiting time can be useful, but a defined stability criterion is even better.

Taking temperature effects into account

The gauge pressure reference, barometer and device under test may all exhibit temperature-dependent measurement deviations.

The following should therefore be considered at a minimum

• ambient temperature,
• temperature range of the reference specification,
• temperature compensation of the DUT,
• warm-up time of the instruments.

If an instrument is taken directly from a cold vehicle into a warm laboratory, for example, the electrical display may already be operational even though the complete measurement system has not yet reached thermal equilibrium.

A high display resolution does not automatically mean that the measured value is already stable or sufficiently accurate.

Why atmospheric pressure is not the zero point of an absolute pressure sensor

This point frequently causes confusion in practice.

A gauge pressure sensor with its connection open to the atmosphere indicates

0 bar

.

An absolute pressure sensor with its connection open to the atmosphere, however, indicates approximately

1 bar absolute

.

This is not a zero-point error.

The actual zero point of an absolute pressure sensor is:

0 bar absolute

which corresponds to an ideal vacuum.

If the DUT is opened to the atmosphere

only a calibration point close to the current atmospheric pressure can therefore be checked.

For example:

Barometer = 984.8 mbar absolute

An ideal absolute pressure sensor should then also indicate:

984.8 mbar absolute

.

Calibration points below atmospheric pressure

An absolute pressure sensor with, for example:

0 … 2 bar absolute

often also needs to be tested below:

1 bar absolute

.

This requires vacuum generation.

Example

Desired absolute pressure:

0.500 bar absolute

Atmospheric pressure:

0.985 bar absolute

Required gauge pressure:

prel = 0.500 − 0.985 bar

prel = −0.485 bar

The gauge pressure reference must therefore be capable of measuring negative gauge pressure or vacuum.

For example, for 100 mbar absolute

with:

985 mbar atmospheric pressure

the required value would be:

prel = 100 − 985 mbar

prel = −885 mbar

The closer the desired absolute pressure approaches zero

the greater the requirements for:

• vacuum generation,
• leak tightness,
• negative gauge pressure measurement,
• barometric reference.

For very low absolute pressures, a direct absolute pressure or vacuum reference is often the technically preferable solution.

What does pseudo-absolute pressure mean?

Modern pressure calibrators can automatically combine a gauge pressure measurement with a barometric measurement.

Druck, for example, refers to this derived pressure type as:

Pseudo-Absolute Pressure

or:

Pseudo-Abs

The underlying principle remains

Gauge pressure sensor + barometer = calculated absolute pressure

The user sees the absolute pressure value directly and does not need to perform the addition manually.

The reverse conversion is also possible

With an absolute pressure sensor, a pseudo-gauge pressure can be generated by subtracting atmospheric pressure:

prel = pabs − patm

The terminology must be clearly distinguished

Pseudo-absolute pressure is calculated from:

gauge pressure + barometric pressure

.

A true absolute pressure sensor, by contrast, measures directly relative to an internal vacuum reference.

Both approaches can be suitable for calibration – but their measurement uncertainty models are different.

Measurement uncertainty of barometric correction

For precise calibration, calculating the reference value alone is not sufficient.

Its measurement uncertainty must also be evaluated.

For the derived absolute pressure:

pabs = prel + patm

a simplified combined standard uncertainty can, for example, be expressed as:

u(pabs) = √[u²(prel) + u²(patm) + u²(pstab) + u²(pheight) + ...]

Typical uncertainty contributions include

• calibration uncertainty of the gauge pressure reference,
• long-term stability of the gauge pressure reference,
• resolution of the reference,
• temperature dependence of the reference,
• calibration uncertainty of the barometer,
• stability of the barometer,
• height correction,
• pressure stability during measurement,
• resolution and repeatability of the device under test.

Which contributions are actually required depends on the calibration method used and the target measurement uncertainty.

Why barometer uncertainty contributes directly

The sensitivity of absolute pressure to the barometer value is:

∂pabs / ∂patm = 1

This means:

A barometer error of:

+0.5 mbar

also causes an error of:

+0.5 mbar

in the calculated absolute pressure.

This effect becomes relatively smaller at high pressures

At a test point of:

100 bar absolute

a few tenths of a mbar are relatively small.

At low absolute pressure ranges

the same contribution can represent a significant part of the total measurement uncertainty.

The method:

gauge pressure reference + barometer

should therefore always be evaluated against the required uncertainty of the specific device under test.

Influence of weather and atmospheric pressure changes

Atmospheric pressure can change significantly during the course of a day.

For a gauge pressure measurement, this is normally not a problem because the measurement is directly referenced to the local atmosphere.

When converting to absolute pressure

however, atmospheric pressure becomes an explicit measured quantity.

Assume that a calibration begins at:

patm = 1002.0 mbar

and several hours later the atmospheric pressure is:

999.5 mbar

If the original barometer value were still used, the calculated absolute pressure would contain a difference of:

2.5 mbar

.

Therefore

The higher the accuracy requirement and the longer the calibration takes, the more important it becomes to measure atmospheric pressure at the relevant time or continuously.

Typical calibration errors

Observation	Possible cause	Recommended check
Absolute pressure sensor indicates about 1 bar with its connection open	normal behavior of an absolute pressure sensor	compare with current barometer value
Calibration value differs by approximately 1 bar	gauge pressure and absolute pressure confused	check pressure reference type of all instruments
Constant offset across all test points	incorrect barometer value possible	check barometer and applied correction
Result is correct only on a particular day	fixed atmospheric pressure used	measure current local atmospheric pressure
Weather app and laboratory barometer differ significantly	weather value may be reduced to sea level	use local station pressure
Measured values drift after increasing pressure	thermal stabilization of the gas	allow sufficient stabilization time
Deviation depends on the height of the test setup	hydrostatic height correction missing	check reference levels and height difference
Uncertainty is significantly higher than expected	barometer dominates the uncertainty budget	check barometer specification and calibration uncertainty
0 bar absolute cannot be reached	insufficient vacuum	determine achievable minimum absolute pressure
Test point below atmospheric pressure cannot be generated	reference or pressure source suitable only for positive gauge pressure	check negative gauge pressure capability and vacuum generation
Repeated measurements differ	pressure not yet stable or leakage present	perform leak test and check stability criterion
DUT and reference differ when high accuracy is required	different reference heights	apply hydrostatic pressure correction

Systematically performing the calibration

1. Check the pressure reference type of the DUT: Ensure that it is actually an absolute pressure sensor.
2. Define the measuring range: Determine minimum and maximum pressure as well as the required calibration points.
3. Select the gauge pressure reference: Measuring range and measurement uncertainty must be suitable for the task.
4. Select the barometer: Use a calibrated barometer with sufficient accuracy.
5. Check the vacuum range: For test points below atmospheric pressure, the reference must be able to measure negative gauge pressure.
6. Connect DUT and reference: Connect both to the same stable pressure volume.
7. Check for leaks: Verify the leak tightness of the system before calibration.
8. Define the reference height: Document height differences between reference and DUT.
9. Define the barometer position: Correct the height difference to the relevant measurement point if required.
10. Stabilize the instruments: Allow sufficient thermal warm-up and stabilization time.
11. Measure atmospheric pressure: Document the current local barometer reading.
12. Set the test pressure: Generate the required gauge pressure.
13. Allow pressure to stabilize: Measure only after the defined stability criterion has been met.
14. Record values simultaneously: Time-correlate gauge pressure, barometric pressure and DUT value.
15. Calculate absolute pressure: pabs = prel + patm.
16. Determine the deviation: Compare the DUT value with the calculated reference value.
17. Apply additional calibration points: Perform an increasing and, where applicable, decreasing measurement sequence.
18. Evaluate measurement uncertainty: Consider reference, barometer, stability and other relevant contributions.
19. Document the results: Record pressure reference type, barometer value, reference height, temperature and measurement method.

Practical example of a multipoint calibration

A pressure transmitter with:

0 … 10 bar absolute

is to be tested at several points.

During the measurement sequence, the atmospheric pressure is approximately:

0.9900 bar absolute

Target absolute pressure	Required gauge pressure
1.000 bar abs	0.010 bar gauge
2.500 bar abs	1.510 bar gauge
5.000 bar abs	4.010 bar gauge
7.500 bar abs	6.510 bar gauge
10.000 bar abs	9.010 bar gauge

Important

The table applies only for:

patm = 0.9900 bar

If atmospheric pressure changes to, for example:

0.9980 bar

the required gauge pressure values must also be adjusted.

Alternatively, the actual absolute pressure achieved can be calculated

If, for example:

prel = 4.0000 bar

is applied and:

patm = 0.9980 bar

is measured, the actual test point is:

pabs = 4.9980 bar

This value can then be used as the reference value.

When a direct absolute pressure reference is preferable

The combination of a gauge pressure reference and barometer can provide very good performance.

However, it is not automatically the best solution for every application.

A direct absolute pressure reference is particularly useful

when:

• very low absolute pressures are being tested,
• barometer uncertainty represents too large a share of the uncertainty budget,
• very high accuracy is required,
• calibration should be independent of current atmospheric pressure,
• the simplest possible traceability chain is desired.

At high absolute pressures

the barometric component is often small relative to the total pressure.

At an absolute pressure of:

100 bar

atmospheric pressure represents only approximately:

1 %

of the total value.

With a measuring range of, for example, 0 … 1.2 bar absolute

the atmospheric component, by contrast, represents a significant proportion of the entire measured quantity.

The calibration method should therefore always be selected based on the pressure range and required measurement uncertainty.

Suitable pressure calibration equipment from ICS Schneider

Druck DPI610E

The DPI610E Portable Pressure Calibrator is particularly suitable for on-site calibration work.

The pneumatic versions combine:

• pressure and vacuum generation,
• high-accuracy pressure measurement,
• electrical measurement functions,
• integrated barometer,
• automated test and documentation functions.

The integrated barometer enables conversion between gauge and absolute pressure and the use of so-called pseudo pressure ranges.

This makes the instrument particularly suitable for applications in which an absolute pressure DUT is to be tested using a reference that originally measures gauge pressure.

PM700E external pressure sensors

The PM700E external pressure sensors allow the DPI610E to be expanded with additional pressure ranges.

The series includes versions for:

• gauge pressure,
• absolute pressure,
• differential pressure,
• barometric pressure.

This allows a calibration solution to be adapted specifically to different pressure reference types and measuring ranges.

PACE5000E

For laboratory and test bench applications, the PACE5000E High-Precision Pressure Controller is a suitable solution for automated pressure calibration.

With the barometric option, the system can provide a derived absolute pressure in addition to gauge pressure.

The basic principle is:

Gauge pressure + barometric pressure = absolute pressure

The conversion is performed directly by the calibration system.

PACE6000E

The PACE6000E extends this concept to a flexible dual-channel system for demanding laboratory, calibration and test bench applications.

Depending on the control module and pressure range used, different gauge and absolute pressure configurations are available.

Which solution is suitable?

In simplified form:

mobile calibration → DPI610E

additional pressure ranges or reference types → PM700E

automated laboratory calibration bench → PACE5000E

complex dual-channel test bench → PACE6000E

The final selection should be based on pressure range, required measurement uncertainty, pressure medium, mobility requirements and calibration method.

Conclusion

An absolute pressure sensor can generally be calibrated using a gauge pressure reference provided that the current atmospheric pressure is additionally measured with sufficient accuracy.

The fundamental relationship is

pabs = prel + patm

The current barometer value is decisive

The standard atmospheric pressure of 1.01325 bar must not simply be used as the actual ambient pressure.

The barometer becomes part of the reference

Its calibration uncertainty, stability and resolution must therefore be included in the evaluation of the total measurement uncertainty.

Gauge pressure and barometric pressure should correspond in time

Because atmospheric pressure can change, the barometer value should be recorded at the relevant calibration points.

Height can also be relevant

At high accuracy levels, height differences of only a few meters between the barometer, reference and device under test can produce measurable pressure differences.

Atmospheric pressure is not the zero point of an absolute pressure sensor

An absolute pressure sensor with its connection open to the atmosphere indicates approximately the atmospheric pressure. Its physical zero point is an ideal vacuum.

For very low absolute pressures, a direct absolute pressure reference may be more suitable

As the pressure approaches vacuum, the requirements for vacuum generation, leakage rate, barometer performance and negative gauge pressure measurement increase.

For practical applications

Determine the pressure reference type of the DUT → select a suitable gauge pressure reference → provide a calibrated barometer → define reference heights → check the measurement system for leaks → allow temperature to stabilize → measure the current local atmospheric pressure → set the test pressure → allow stabilization → record gauge pressure, barometer and DUT values as simultaneously as possible → calculate absolute pressure using pabs = prel + patm → take height and stability effects into account → determine measurement deviation → evaluate the complete uncertainty budget → document measurement conditions and barometer values.

FAQ: Calibrating an Absolute Pressure Sensor with a Gauge Pressure Reference

Can I test an absolute pressure sensor using a gauge pressure calibrator?

Yes. The current atmospheric absolute pressure must additionally be measured and added to the gauge pressure.

What is the formula for converting gauge pressure into absolute pressure?

pabs = prel + patm.

What does patm mean?

patm is the current local atmospheric absolute pressure.

Can I simply use 1.01325 bar for patm?

No. 1.01325 bar is the defined standard atmospheric pressure and does not automatically correspond to the current pressure at the calibration location.

Can I use atmospheric pressure from a weather app?

For traceable calibration, a suitable calibrated barometer should be used. Weather services also frequently report atmospheric pressure reduced to sea level.

What does an absolute pressure sensor indicate when its pressure connection is open?

It indicates approximately the current atmospheric absolute pressure, typically a value in the region of 1 bar absolute.

Why does a gauge pressure sensor indicate 0 bar when its connection is open?

Because its reference is the current atmospheric pressure. There is then no pressure difference between the measuring connection and the surroundings.

Where is the zero point of an absolute pressure sensor?

At 0 bar absolute, corresponding to an ideal vacuum.

Can I test the zero point of an absolute pressure sensor at atmospheric pressure?

No. At atmospheric pressure, a point close to 1 bar absolute is tested. A suitable vacuum source is required for a point close to 0 bar absolute.

How do I generate 5 bar absolute using a gauge pressure reference?

Subtract the current atmospheric pressure from the desired absolute pressure. With, for example, 0.985 bar atmospheric pressure, approximately 4.015 bar gauge would be required.

Can I also test absolute pressures below 1 bar?

Yes, provided the pressure system can generate vacuum and the gauge pressure reference can reliably measure the corresponding negative gauge pressure.

How do I calculate the required negative gauge pressure?

Using prel = pabs − patm. At 0.5 bar absolute and 1.0 bar atmospheric pressure, the result is approximately −0.5 bar gauge.

What is pseudo-absolute pressure?

Pseudo-absolute pressure is calculated from a gauge pressure measurement and an additional barometric measurement.

Is pseudo-absolute pressure the same as a direct absolute pressure measurement?

No. Pseudo-absolute pressure combines two measured quantities. An absolute pressure sensor, by contrast, has its own absolute reference.

Why does the barometer need to be calibrated?

Because its measured value directly contributes to the calculated absolute reference pressure and therefore forms part of the calibration chain.

What effect does a barometer error of 1 mbar have?

Under otherwise unchanged conditions, a 1 mbar error in the barometer reading also causes approximately a 1 mbar error in the calculated absolute pressure.

Does the barometer value have to be measured for every calibration point?

For high accuracy requirements, acquisition close in time or continuous measurement is advisable because atmospheric pressure can change during calibration.

Why does the height of the barometer matter?

Atmospheric pressure decreases with increasing height. At high accuracy levels, a height difference between barometer and device under test may therefore need to be taken into account.

How large is the atmospheric pressure difference per meter of height?

Under typical ambient conditions, it is approximately 12 Pa or 0.12 mbar per meter.

Does the height difference between the DUT and the pressure reference also matter?

Yes. The hydrostatic pressure difference depends on the density of the pressure medium, gravitational acceleration and height difference.

Is the height effect larger with liquids?

Yes. Liquids have a much higher density than air. Height differences can therefore produce significantly larger pressure differences in hydraulic calibrations.

Why do I need to wait after setting a pressure?

The pressure medium, lines and sensors must stabilize thermally and mechanically after a pressure change.

Why can pneumatic pressure change after compression?

The gas heats up during compression. As the temperature subsequently equalizes, the pressure changes.

What should be included in the uncertainty budget?

Among other factors, the uncertainty of the gauge pressure reference, the barometer, stability and temperature effects, height corrections and contributions from the device under test.

When is a direct absolute pressure reference preferable?

Particularly at very low absolute pressures, very low measurement uncertainties or when the contribution of the barometric reference becomes too large.

Can the DPI610E calculate absolute pressure from gauge pressure?

Yes. The pneumatic DPI610E versions include an integrated barometer and support derived pseudo-absolute pressure ranges.

Can the DPI610E also generate vacuum?

Yes. The pneumatic versions are designed for vacuum and positive pressure generation and are therefore also suitable for calibration points below atmospheric pressure.

What are PM700E pressure sensors?

PM700E units are external pressure modules for the DPI610E. They are available for different pressure ranges and, among other types, for gauge, absolute, differential and barometric pressure measurement.

Can the PACE5000E convert gauge pressure into absolute pressure?

With the appropriate barometric option, a gauge pressure range can be combined with the measured atmospheric pressure and used as absolute pressure.

Which instrument is suitable for mobile calibration?

The DPI610E is specifically designed as a portable pressure calibrator for laboratory and on-site applications.

Which instrument is suitable for automated calibration benches?

For laboratory and test bench applications, the modular PACE5000E and PACE6000E pressure controllers are suitable options.

Where can I find the DPI610E at ICS Schneider?

Further information is available under DPI610E at ICS Schneider.

Where can I find the PM700E pressure modules?

Further information is available under PM700E at ICS Schneider.

Where can I find the PACE5000E?

Further information is available under PACE5000E at ICS Schneider.

Where can I find further pressure calibration equipment?

An overview is available under Calibration Technology at ICS Schneider.