DatasheetSiemens SITRANS P320/P420 Pressure Transmitters
The Siemens SITRANS P320/P420 pressure transmitters are digital measuring instruments for demanding industrial applications. They are suitable for precise measurement of relative pressure, absolute pressure, differential pressure, level, volume flow and mass flow. Thanks to their robust construction, high measuring accuracy and comprehensive diagnostic functions, they are particularly suitable for processes with increased requirements for safety, availability and long-term stability.
The devices provide high accuracy and comprehensive diagnostics according to NAMUR NE107. This allows device conditions, process deviations and possible faults to be detected at an early stage. For safety-related applications, SIL versions developed according to IEC 61508 are available. Validation can be carried out directly on the device or remotely via SIMATIC PDM.
Key benefits
- Digital pressure transmitters for demanding process applications
- Diagnostic functions according to NAMUR recommendation NE107
- SIL devices developed according to IEC 61508
- SIL validation directly on the device or remotely via SIMATIC PDM
- Reduction of inductivity for Ex applications to LI = 0
- Very low temperature influence and excellent long-term stability
- High quality and long service life
- High reliability even under extreme chemical and mechanical loads
- Suitable for aggressive and non-aggressive gases, vapours and liquids
- Comprehensive diagnostic and simulation functions
- Separate replacement of measuring cell and electronics without recalibration
- Convenient parameterization via 4 push buttons or HART interface
Typical applications
The SITRANS P320/P420 pressure transmitters are used in industrial processes where high requirements exist for accuracy, diagnostics, material resistance and operational safety. They are especially suitable for plants with extreme chemical or mechanical loads.
- Chemical and petrochemical industry
- Power generation and power plant engineering
- Oil and gas industry
- Water and wastewater technology
- Process plants with aggressive media
- Applications with high safety requirements
- Level measurement in open and closed vessels
- Differential pressure and flow measurement
Measuring tasks and device versions
The SITRANS P320/P420 series is available in different versions. This allows the pressure transmitter to be adapted to different measuring tasks and process conditions.
| Measuring task | Description | Typical measuring ranges |
|---|---|---|
| Relative pressure | Measurement of relative pressure of aggressive and non-aggressive gases, vapours and liquids. | For SITRANS P320/P420 with HART: 0.01 bar to 700 bar / 0.15 psi to 10,153 psi |
| Absolute pressure | Measurement of absolute pressure of aggressive and non-aggressive gases, vapours and liquids. | For SITRANS P320/P420 with HART: 8.3 mbar a to 160 bar a / 0.12 psi a to 2,321 psi a |
| Differential pressure | Measurement of differential pressure, effective pressure and small positive or negative gauge pressure. | For SITRANS P320/P420 with HART: 1 mbar to 160 bar / 0.0145 psi to 2,321 psi |
| Level | Measurement of levels of aggressive and non-aggressive liquids in open and closed vessels. | For SITRANS P320/P420 with HART: 25 mbar to 5 bar / 0.363 psi to 72.5 psi |
| Volume flow | Flow measurement via differential pressure in combination with a primary differential pressure device. | Depending on primary element and process design |
| Mass flow | Mass flow measurement based on differential pressure measurement and process compensation. | Depending on application and configuration |
Diagnostics and digitalization
The SITRANS P320/P420 devices offer extended diagnostic functions according to NAMUR NE107. These functions help users assess the condition of the transmitter and measuring point. Status messages can be used for maintenance planning, fault analysis and improving plant availability.
Via the HART interface, the transmitters can be conveniently parameterized, monitored and integrated into asset management systems. Local operation is performed using four push buttons and an easy-to-read display. Parameterization can therefore be carried out either directly on the device or via suitable software tools.
Safety and SIL function
The SITRANS P320/P420 pressure transmitters are available for safety-related applications. The devices have been developed according to IEC 61508 and support SIL applications. The SIL function can be validated locally or remotely via SIMATIC PDM. This reduces effort during commissioning, testing and recurring validation.
Versions with suitable explosion protection approvals are available for hazardous areas. With the appropriate approval, the devices can be used in Zone 1 or Zone 0. The applicable installation and approval requirements must be observed for Ex applications.
Materials and process adaptation
The wetted parts can be made of high-quality materials such as stainless steel, Alloy, gold, Monel or tantalum. This allows the transmitters to be adapted to different media and corrosion requirements. Remote seal versions are available for special applications, for example highly viscous media.
Flange and connection versions for level measurement
Different mounting flanges are available for level applications. These include flanges according to EN 1092-1, ASME B16.5 and J.I.S.. Various sealing face designs allow adaptation to different vessel and process connections.
Technical overview
| Product | Siemens SITRANS P320/P420 |
|---|---|
| Device type | Digital pressure transmitter for demanding applications |
| Measured variables | Relative pressure, absolute pressure, differential pressure, level, volume flow, mass flow |
| Communication | HART communication |
| Operation | Local parameterization via 4 push buttons or external parameterization via HART interface |
| Diagnostics | Diagnostic functions according to NAMUR NE107 |
| Safety function | SIL devices developed according to IEC 61508 |
| SIL validation | On the device or remotely via SIMATIC PDM |
| Step response time | Pressure version T63 = 105 ms; differential pressure version 135 ms |
| Measuring spans | Continuously adjustable measuring spans from 0.01 bar to 700 bar / 0.15 psi to 10,153 psi |
| Wetted part materials | High-quality materials such as stainless steel, Alloy, gold, Monel or tantalum |
| Media | Aggressive and non-aggressive gases, vapours and liquids |
| Hazardous area | Can be operated in Zone 1 or Zone 0 with suitable Ex approval |
| Remote seals | Available in different designs for special applications, e.g. highly viscous media |
| Level flanges | EN 1092-1, ASME B16.5, J.I.S. and various sealing face designs |
| Special features | High measuring accuracy, low characteristic deviation, excellent long-term stability, comprehensive diagnostic and simulation functions |
Practical benefit
The SITRANS P320/P420 is a suitable solution for measuring points where standard pressure transmitters are not sufficient. The combination of high accuracy, robust construction, HART communication, diagnostic functions and SIL option makes the series particularly interesting for critical process measurements and demanding industrial plants.
