The Siemens SITRANS P family is a broad portfolio of transmitters developed for pressure measurement in process industries. In the current product line, SITRANS P320/P420 stand out for process pressure, differential pressure, level and flow measurement tasks, while SITRANS P300 focuses on hygienic food, beverage and pharmaceutical applications. For hydrostatic level measurement, Siemens offers separate products such as SITRANS LH100.
SITRANS P320/P420 provide high accuracy, fast response, advanced device diagnostics and Remote Safety Handling functions with remote access to safety-related features, making them particularly suitable for chemical, petrochemical and safety-critical processes.
Key advantages:
Gauge, absolute and differential pressure measurement options
Accuracy up to 0.065% for P320, 0.04% for P420
Fast response and long-term stability
NAMUR NE107-based diagnostics
HART®, PROFIBUS PA and FOUNDATION™ Fieldbus options
SIL 2/3 applications under IEC 61508
Remote Safety Handling
Remote Seal options
ATEX, IECEx, FM, CSA and other approvals
Low maintenance and optimized TCO
|
Model |
Measurement / Application |
Key Features |
Positioning |
|
SITRANS P320 |
Gauge, absolute, differential, level and flow |
Accuracy up to 0.065%, advanced diagnostics, SIL applications |
Current general process solution |
|
SITRANS P420 |
Gauge, absolute, differential, level and flow |
Accuracy up to 0.04%, advanced digital features and trend logging |
High-performance process solution |
|
SITRANS P300 |
Gauge and absolute pressure |
Hygienic connections, stainless steel housing, EHEDG/3A design |
Food, beverage and pharma |
|
SITRANS P DS III / P410 |
Previous generation process transmitters |
HART®, PROFIBUS PA and FOUNDATION™ Fieldbus variants |
Legacy / existing installations |
|
SITRANS LH100 |
Hydrostatic level |
Ceramic cell, stainless steel housing, IP68 |
Submersible level applications |
Product selection is not based solely on model name. The MLFB / Article Number structure defines measurement type, communication, sensor cell and other order options.
Examples:
SITRANS P320 → 7MF03.0 (HART®), 7MF03.1 (PROFIBUS PA), 7MF03.2 (FOUNDATION™ Fieldbus)
SITRANS P420 → 7MF04.0 (HART®), 7MF04.1 (PROFIBUS PA), 7MF04.2 (FOUNDATION™ Fieldbus)
📑 Note: Even a single character in the MLFB code can change measurement type, communication protocol, sensor cell or certification. Always verify the full MLFB against Siemens documentation before RFQ or purchase.
SITRANS P transmitters detect process pressure in the sensor cell and convert it into a measurement value via electronic signal processing. Temperature effects are compensated and the process value is transmitted to the control system via the selected output and communication interface.
Supported protocols:
4–20 mA / HART®
PROFIBUS PA
FOUNDATION™ Fieldbus
|
Parameter |
SITRANS P320/P420 |
|
Measurement Types |
Gauge, Absolute, Differential |
|
Supported Tasks |
Pressure, level, volumetric and mass flow |
|
Accuracy |
Up to 0.065% (P320), up to 0.04% (P420) |
|
Range |
10 mbar–700 bar |
|
Response Time |
Down to 105 ms |
|
Long-Term Stability |
≤ 0.125% / 5 years |
|
Communication |
HART®, PROFIBUS PA, FOUNDATION™ Fieldbus |
|
Diagnostics |
NAMUR NE107 |
|
Functional Safety |
SIL 2/3 under IEC 61508 |
|
Certifications |
ATEX, IECEx, FM, CSA, NEPSI |
|
Operating Temperature |
–40°C to +100°C |
⚡ Power Plants → Steam systems, condensate lines, feedwater systems, vacuum and differential pressure applications
🛢️ Oil & Gas → Process lines, separators, storage tanks, hazardous area applications
🧪 Chemical & Petrochemical → Reactor pressure, corrosive fluids, differential pressure, Safety Instrumented Systems
💧 Water & Wastewater → Pump stations, filtration systems, hydrostatic level measurement
💊 Food & Pharma → Hygienic processes (P300)
🔧 OEM & Skid Systems → Packaged process equipment, compressors, compact automation units
✔ High measurement accuracy
✔ Long-term stability
✔ NAMUR NE107 diagnostics
✔ Guided commissioning
✔ Remote Safety Handling
✔ SIL 2/3 support
✔ Proof-test intervals up to 15 years
✔ Trend logging (P420 stores up to 1,500 values)
✔ HART®, PROFIBUS PA, FOUNDATION™ Fieldbus
Recommended checks:
Mechanical installation
Process connections
Power supply
4–20 mA loop test
HART® communication verification
Measurement range check
Zero adjustment / sensor trim
Alarm and diagnostics verification
Ex and SIL requirements
|
Problem |
Possible Cause |
Recommended Action |
|
Measurement drift |
Incorrect zero or process conditions |
Zero adjustment, check connections |
|
Unstable signal |
Process fluctuations or installation issue |
Inspect connections and conditions |
|
Faulty 4–20 mA output |
Power, wiring or configuration issue |
Check loop supply and settings |
|
HART® communication failure |
Loop or configuration issue |
Verify wiring and parameters |
|
Diagnostics alarm |
Sensor or process condition |
Review NAMUR NE107 diagnostics |
Difference between P320 and P420: P420 offers higher accuracy (0.04%) and trend logging.
Pressure types: Gauge, absolute, differential; also level and flow tasks.
Communication protocols: 4–20 mA/HART®, PROFIBUS PA, FOUNDATION™ Fieldbus.
SIL applications: Supported under IEC 61508 SIL 2/3.
DS III vs P320/P420: DS III is legacy, P320/P420 are current successors.
P300 applications: Food, beverage and pharmaceutical hygienic measurement.
LH100 position: Hydrostatic level transmitter, separate from SITRANS P family.
Correct product code selection: Full MLFB verification required.
RFQ process: Fast quotation once model and configuration are validated.
Yeşil Grup Enerji, as an independent multi-brand supplier (not an official Siemens distributor), provides project-based supply and technical evaluation for SITRANS P products.
Services include:
Model and MLFB verification
Siemens datasheet and documentation checks
Product configuration analysis
Legacy replacement evaluation
Cross-reference analysis
Application suitability assessment
Spare parts and accessories research
Global sourcing
Fast RFQ management
International project supply
📞 +90 505 696 61 00
Siemens SITRANS P pressure transmitters provide a wide product family for process pressure, differential pressure and related measurement tasks. In the current portfolio, SITRANS P320 and P420 stand out with high accuracy, advanced diagnostics, digital communication and safety-related functions. P320 offers accuracy up to 0.065%, while P420 provides up to 0.04%, with support for HART®, PROFIBUS PA and FOUNDATION™ Fieldbus.
SITRANS P300 is distinct, focusing on hygienic food, beverage and pharmaceutical applications. Hydrostatic level measurement is covered by SITRANS LH100, which should be evaluated separately. Treating these products by application rather than as a single technical class ensures correct product selection.
Legacy SITRANS P DS III/P410 transmitters must be checked against Siemens records, as they are discontinued and replaced by P320/P420. For modernization or replacement projects, the full MLFB code must be reviewed to identify the correct current model.
Yeşil Grup Enerji is not an official Siemens distributor. As an independent multi-brand supplier, it offers model verification, documentation checks, MLFB evaluation, application suitability analysis, legacy replacement, global sourcing and fast RFQ management. With a project-based supply approach, Yeşil Grup Enerji supports identifying the most suitable product for technical requirements and delivery conditions.
Important Note: Final product selection and order verification for Siemens SITRANS P transmitters must always be based on the latest Siemens technical documentation and the complete MLFB/order code. A model family name alone does not define communication protocol, sensor cell, process connection or certification configuration.