The Siemens SITRANS P320 is a digital pressure transmitter designed for industrial process pressure measurement. Depending on the configuration, it can be used for gauge pressure, absolute pressure and differential pressure measurement in gases, vapors and liquids.
Depending on the selected configuration, the SITRANS P320 can also be applied to level, volumetric flow and mass flow measurement. Siemens specifies a measuring range of 10 mbar to 700 bar, depending on the version and measuring cell. The maximum stated accuracy for the P320 is up to 0.065%.
One of the key advantages of the P320 is not limited to measurement performance. The product family combines digital communication, NAMUR NE107 diagnostics, Remote Safety Handling and functional safety capabilities for demanding process automation applications.
| Technical Specification | SITRANS P320 |
|---|---|
| Product type | Digital pressure transmitter |
| Measurement types | Gauge, Absolute, Differential Pressure |
| Additional applications | Level, volumetric flow, mass flow |
| Measuring range | 10 mbar–700 bar, depending on version and measuring cell |
| Accuracy | Up to 0.065%, depending on configuration |
| Response time | Down to 105 ms |
| Long-term stability | ≤ 0.125% / 5 years |
| Communication | 4–20 mA + HART, PROFIBUS PA, FOUNDATION Fieldbus |
| Digital communication | PROFINET over Ethernet-APL, depending on version |
| Diagnostics | NAMUR NE107 |
| Functional Safety | IEC 61508, SIL 2/3 applications |
| Remote Safety Handling | Supported |
| Proof-test interval | Up to 15 years for suitable safety configurations |
| Measured medium temperature | -40 to +100 °C, depending on configuration |
| Approvals | ATEX, IECEx, FM, CSA, NEPSI and others, depending on configuration |
| Diaphragm options | Various materials depending on application |
| Housing | Industrial process transmitter design |
Siemens specifies the main P320/P420 performance figures according to product version and configuration. Therefore, the exact MLFB and technical configuration should always be verified before ordering.
Gauge pressure measurement determines process pressure relative to atmospheric pressure.
SITRANS P320 gauge pressure configurations can be used in applications such as:
Process pipelines
Pumps
Compressors
Gas systems
Steam lines
Pressure vessels
Process equipment
Gauge pressure is generally selected when atmospheric pressure is the required reference for the measurement.
Absolute pressure measurement uses absolute vacuum as the reference rather than atmospheric pressure.
This makes absolute pressure suitable for applications where atmospheric pressure variations should not influence the measurement, including:
Vacuum processes
Low-pressure applications
Distillation systems
Vacuum pumps
Process control systems
Differential pressure measurement determines the pressure difference between two process points.
Depending on the configuration, the SITRANS P320/P420 family can be used for:
Filter monitoring
Flow measurement
Tank level measurement
Process pressure differential monitoring
Pump and equipment performance monitoring
Differential pressure measurement is particularly important in process applications where the pressure difference between two points represents a process variable.
For Siemens products, the MLFB (Machine-Readable Product Designation) is critical for identifying the exact ordering configuration.
"SITRANS P320" represents the product family. It does not, by itself, define the complete orderable configuration.
The following parameters may need to be evaluated:
Measurement type
Measuring cell
Measuring range
Process connection
Diaphragm material
Fill fluid
Electrical connection
Communication protocol
Hazardous-area certification
Display
Special options
A Siemens P320 HART operating document shows an example nameplate with an MLFB in the format 7MF0350-1G*01-5BF0-Z. The * character represents a placeholder within the documentation example and should not be treated as a complete orderable MLFB by itself.
For PROFIBUS PA and FOUNDATION Fieldbus versions, Siemens documentation identifies the following P320 product families:
7MF03.1 – SITRANS P320 PROFIBUS PA
7MF03.2 – SITRANS P320 FOUNDATION Fieldbus
Different SITRANS P320 configurations can include different:
Measuring ranges
Pressure types
Process connections
Diaphragm materials
Communication protocols
Hazardous-area approvals
Electrical connections
Therefore, an RFQ based only on "Siemens P320" or a shortened product-family designation can create a risk of selecting the wrong configuration.
The complete MLFB should be verified against the Siemens documentation and the project specification before ordering.
Siemens specifies the SITRANS P320 with up to 0.065% accuracy under suitable conditions and configurations.
This should not be interpreted as a fixed accuracy value for every P320 configuration.
Actual performance can depend on:
Measuring cell
Nominal measuring range
Configured span
Turndown ratio
Measurement type
Process conditions
Ambient conditions
For engineering specifications, it is therefore preferable to verify the exact accuracy for the selected configuration rather than simply stating that every P320 provides 0.065% accuracy.
Siemens specifies a response time of down to 105 ms and long-term stability of ≤ 0.125% over 5 years for the P320/P420 family, depending on the applicable configuration.
These characteristics can be particularly relevant for:
Fast process control
Pressure fluctuation monitoring
Critical control loops
Chemical processes
Energy applications
Process automation systems
Actual performance should always be evaluated against the selected configuration and operating conditions.
The SITRANS P320 family supports several communication technologies for integration into process automation systems.
4–20 mA + HART is widely used in conventional process automation architectures.
HART communication enables digital access to device information in addition to the analog process signal.
Depending on the configuration, this can provide access to:
Device parameters
Diagnostic information
Configuration data
Measurement values
Device status
PROFIBUS PA is a digital fieldbus technology widely used in process automation.
Siemens documentation identifies 7MF03.1 as the SITRANS P320 PROFIBUS PA product family.
This makes the P320 suitable for process automation architectures using PROFIBUS PA field-level communication, subject to the selected configuration.
For FOUNDATION Fieldbus versions, Siemens documentation identifies 7MF03.2 as the SITRANS P320 FOUNDATION Fieldbus product family.
Therefore, an RFQ should specify the required communication protocol instead of simply requesting a "SITRANS P320."
Siemens' current P320/P420 product information also lists PROFINET over Ethernet-APL among the available communication technologies.
Ethernet-APL is particularly relevant to modern process automation architectures that require Ethernet-based communication at the field level.
The availability of this communication option should be verified against the exact P320 configuration before ordering.
The SITRANS P320 is designed to support SIL 2/3 applications in accordance with IEC 61508, depending on the applicable configuration and safety architecture.
An important distinction should be made between saying:
"The P320 is SIL 2/3 certified."
and:
"The P320 supports SIL 2/3 applications when used in an appropriate configuration and safety system architecture."
The second statement is technically more appropriate because the achieved SIL capability depends not only on the transmitter but also on:
Device configuration
Safety function
Safety architecture
Proof-test procedures
PFD/PFH calculations
IEC 61508 requirements
IEC 61511 application requirements
For safety-related projects, the applicable Siemens safety documentation should therefore be reviewed together with the complete project safety requirements.
One of the key features of the SITRANS P320/P420 family is Remote Safety Handling.
Depending on the system architecture, this functionality can support:
Device configuration
Maintenance activities
Safety-related functions
SIL validation processes
from the control room.
Siemens positions Remote Safety Handling as a solution that can help reduce field visits, minimize personnel exposure in hazardous areas and simplify commissioning and maintenance activities.
This can be particularly valuable in large process plants where hundreds of field transmitters may need to be configured, verified or maintained.
For suitable safety applications, the P320/P420 family can support proof-test intervals of up to 15 years.
A longer proof-test interval can have a positive impact on:
Maintenance planning
Shutdown organization
Field access requirements
Maintenance workload
Total cost of ownership
However, a 15-year interval should not be interpreted as an automatic maintenance interval for every application.
The applicable proof-test interval must be established according to the plant's safety lifecycle, safety calculations and applicable standards.
The SITRANS P320/P420 family supports NAMUR NE107 diagnostics.
NAMUR NE107 provides a standardized approach for classifying device status information, helping maintenance personnel identify equipment conditions more efficiently.
Depending on the diagnostic condition, maintenance teams can more easily distinguish between:
Device failures
Maintenance requirements
Process-related conditions
Device status conditions
This can improve troubleshooting and predictive maintenance strategies in process automation systems.
The SITRANS P320 can be used across a wide range of industrial sectors.
Potential applications include:
Reactor pressure
Process pipelines
Tank pressure
Differential pressure
Level measurement
Pressure transmitters are commonly required for:
Process columns
Pumps
Compressors
Pipelines
Storage tanks
Filters
Potential applications include:
Steam systems
Feedwater systems
Auxiliary processes
Pressurized gas systems
Differential pressure measurement
In gas applications, reliability, correct pressure range selection and appropriate hazardous-area certification can be critical.
The P320's diagnostics and functional safety capabilities can be relevant where these requirements apply.
Depending on the configuration, the P320 can be used for:
Pump pressure
Pipeline pressure
Filter differential pressure
Tank level
Differential pressure measurement can be used to determine liquid level based on the hydrostatic pressure generated by a liquid column.
A suitable P320 configuration can therefore be considered for:
Closed tanks
Pressurized vessels
Process vessels
Chemical storage tanks
The application should take into account:
Tank geometry
Liquid density
Temperature
Static pressure
Process connections
For high-temperature, corrosive or crystallizing media, options such as remote seals may need to be considered.
Differential pressure can also be used for flow measurement when the transmitter is combined with an appropriate primary flow element.
Examples include:
Orifice plates
Venturi tubes
Flow nozzles
The resulting differential pressure can be measured using an appropriate differential-pressure configuration.
This creates additional commercial search opportunities around terms such as:
Siemens P320 differential pressure transmitter
Siemens P320 DP transmitter
Siemens P320 flow measurement
Siemens P320 level measurement
SITRANS P320 HART
SITRANS P320 PROFIBUS PA
SITRANS P320 FOUNDATION Fieldbus
Selecting the correct P320 requires more than simply specifying a pressure range.
The following parameters should be evaluated together.
Gauge Pressure
Absolute Pressure
Differential Pressure
Define:
Minimum process pressure
Normal operating pressure
Maximum operating pressure
Maximum allowable working pressure and test pressure should be checked in addition to the normal operating pressure.
Depending on the application, options may include:
Threaded connections
Flanges
Remote seals
Other process-specific configurations
Material selection should consider:
Corrosive media
Process temperature
Chemical compatibility
Solids or particulate content
Specify the required communication technology:
HART
PROFIBUS PA
FOUNDATION Fieldbus
Ethernet-APL, where applicable
For hazardous-area applications, the required approvals should be checked, such as:
ATEX
IECEx
FM
CSA
If the transmitter is used in a safety instrumented function, the complete safety architecture must be evaluated rather than relying solely on the product's SIL designation.
Determine whether local display and local operating functionality are required.
Finally, all selected options should be validated against the complete MLFB before an order is placed.
The following checks can be used during commissioning:
Complete MLFB verified
Measurement type verified
Measuring range verified
Process connection checked
Diaphragm material compatible with the process
Communication protocol verified
Supply voltage checked
4–20 mA loop wiring checked
HART / fieldbus addressing configured
Zero point checked
Required calibration completed
Hazardous-area certification verified
SIL application requirements verified where applicable
NAMUR NE107 diagnostics checked
DCS / PLC / SIS integration tested
Process connections checked for leakage
Commissioning documentation completed
Check:
Supply voltage
Loop wiring
Polarity
Ex barrier / galvanic isolator
Cable continuity
Device diagnostic information
Electrical configuration
Check:
Is the actual process pressure changing?
Is the impulse line blocked?
Is the valve manifold correctly positioned?
Is the sensor connection correct?
Is damping configured appropriately?
Is the transmitter reporting a diagnostic condition?
For differential-pressure applications, particular attention should be given to the impulse lines and manifold.
Possible causes include:
Incorrect measuring range
Incorrect zero adjustment
Incorrect process connection
Process temperature effects
Incorrect diaphragm selection
Pressure pulsations
Impulse line problems
Incorrect transmitter configuration
Check:
Loop resistance
HART modem
Device power supply
Polling/address configuration
HART-compatible infrastructure
Wiring
Device communication version
DCS/PLC integration
| Feature | SITRANS P320 | SITRANS P420 |
|---|---|---|
| Product class | Digital pressure transmitter | Premium digital pressure transmitter |
| Maximum accuracy | Up to 0.065% | Up to 0.04% |
| Measuring range | 10 mbar–700 bar, depending on version | 10 mbar–700 bar, depending on version |
| Communication | HART / PROFIBUS PA / FOUNDATION Fieldbus | HART / PROFIBUS PA / FOUNDATION Fieldbus |
| Functional Safety | SIL 2/3 applications | SIL 2/3 applications |
| NAMUR NE107 | Yes | Yes |
| Remote Safety Handling | Yes | Yes |
| Proof-test | Up to 15 years | Up to 15 years |
| Advanced digital functionality | Advanced | More advanced |
| Trend recording | — | Up to 1,500 measured values |
| Typical positioning | General and critical process applications | Higher accuracy and advanced digitalization requirements |
According to Siemens product information, the P320 can provide accuracy of up to 0.065%, while the P420 can provide up to 0.04%. The P420 also provides onboard trend recording for up to 1,500 measured values.
Therefore, the P420 should not automatically be considered a direct replacement for every P320 application. The selection should be based on accuracy, process requirements, digital functionality, communication and safety requirements.
The SITRANS P320 is particularly relevant in modernization projects involving older Siemens pressure transmitters.
Siemens Industry Mall identifies various SITRANS P DS III / P410 products as canceled products and indicates P320/P420 as successor products for applicable configurations.
However, this transition should not be treated as a simple one-to-one MLFB substitution.
For a P DS III or P410 replacement project, the existing transmitter should first be evaluated for:
Complete MLFB
Measurement type
Measuring range
Process connection
Diaphragm material
Communication protocol
Hazardous-area certification
Remote seal configuration
SIL requirements
The appropriate P320 or P420 configuration can then be determined.
This approach reduces the risk of selecting an unsuitable replacement based solely on the product family name.
A practical replacement workflow is:
Existing transmitter → Complete MLFB → Technical parameter extraction → Process requirement verification → P320/P420 configuration → New MLFB → Certification and documentation check → RFQ
If an older Siemens transmitter is being replaced with a P320, simply stating:
"Replace the existing device with a P320."
is not sufficient.
A technical cross-reference should be performed first.
This makes search terms such as Siemens P320 replacement, SITRANS P320 MLFB, SITRANS P DS III replacement and Siemens pressure transmitter replacement commercially valuable for modernization and procurement projects.
The SITRANS P320 is a digital Siemens pressure transmitter for measuring pressure in gases, vapors and liquids. Depending on the configuration, it can also be used for differential pressure, level and flow applications.
Siemens specifies up to 0.065% accuracy for suitable P320 configurations. The actual accuracy depends on the measuring cell, span and operating conditions.
The P320/P420 family supports measuring ranges from 10 mbar to 700 bar, depending on the version and measuring cell.
Yes. Appropriate P320 configurations support 4–20 mA + HART communication.
Yes. Siemens documentation identifies 7MF03.1 as the SITRANS P320 PROFIBUS PA product family.
Yes. Siemens documentation identifies 7MF03.2 as the SITRANS P320 FOUNDATION Fieldbus product family.
Yes. Siemens specifies IEC 61508-based support for SIL 2/3 applications. Actual SIL suitability depends on the device configuration, safety function and complete safety system architecture.
The P420 is positioned as the higher-performance model, with higher available accuracy and additional digital functionality. Siemens specifies up to 0.065% accuracy for the P320 and up to 0.04% for the P420.
For applicable discontinued P DS III/P410 configurations, Siemens identifies P320/P420 as successor products. However, replacement should be performed based on the complete existing MLFB and application requirements rather than by product-family name alone.
Because "P320" identifies the product family, while the complete MLFB determines the specific configuration, including measuring cell, range, process connection, materials, communication, certification and other options.
Yeşil Grup Enerji is not an official Siemens distributor or authorized Siemens representative.
Yeşil Grup Enerji operates as an independent, brand-independent industrial sourcing supplier, supporting project-based procurement and global sourcing requirements for industrial instrumentation and automation products.
For Siemens SITRANS P320 procurement, the objective is not simply to provide a product name or generic model reference. The correct technical configuration should first be identified according to the customer's project requirements.
SITRANS P320 MLFB verification
Technical cross-reference of existing Siemens transmitters
P320 / P420 replacement evaluation
Gauge / Absolute / Differential Pressure selection review
Measuring range and measuring cell verification
HART / PROFIBUS PA / FOUNDATION Fieldbus configuration review
Process connection and material verification
Ex / ATEX / IECEx and other certification requirement checks
Technical review for SIL-related applications
Technical documentation and configuration checks
Project-based RFQ
International global sourcing
International procurement and supply coordination for projects outside Türkiye
The independent sourcing model means that Yeşil Grup Enerji does not represent Siemens as an official distributor or manufacturer-appointed representative.
Instead, procurement activities are carried out independently according to the customer's technical specification, project requirements and sourcing needs.
For SITRANS P320 MLFB inquiries, Siemens P320 replacement projects, P DS III/P410 modernization or project-specific technical configuration verification, providing the existing transmitter's complete MLFB or technical specification can significantly improve the accuracy of the sourcing process.
The Siemens SITRANS P320 is a modern digital pressure transmitter combining high measurement performance, digital communication, advanced diagnostics and functional safety capabilities for demanding industrial applications.
With up to 0.065% accuracy, measuring ranges from 10 mbar to 700 bar depending on configuration, HART, PROFIBUS PA and FOUNDATION Fieldbus communication options, NAMUR NE107 diagnostics, Remote Safety Handling and support for SIL 2/3 applications, the P320 is a strong option for both critical process applications and modernization projects.
However, selecting the correct P320 requires more than specifying the product family. The complete MLFB, measuring cell, pressure range, process connection, materials, communication protocol, certifications and safety requirements should all be evaluated together.
For older SITRANS P DS III and P410 installations, P320/P420 can provide successor/replacement options for applicable configurations. The correct replacement should nevertheless be determined through a configuration-based technical cross-reference rather than a simple product-name substitution.
Yeşil Grup Enerji is not an official Siemens distributor or authorized representative. As an independent and brand-independent industrial sourcing supplier, Yeşil Grup Enerji can support Siemens SITRANS P320 projects through global sourcing, MLFB verification, replacement analysis, technical configuration review and project-based RFQ processes.