SITRANS P320/P420 – Digital Pressure Transmitters

The SITRANS P320/P420 are robust, reliable digital pressure transmitters with Remote Safety Handling, designed for faster proof testing, high accuracy, and easy compliance.

The SITRANS P320/P420 are robust, reliable digital transmitters with Remote Safety Handling, designed for faster proof testing, high accuracy, and easier compliance.

This robust, highly adaptable process control system ensures optimal availability and maximum efficiency throughout your plant's entire lifecycle.

Head-mounted temperature transmitters for reliable measurement, easy integration, and advanced diagnostics, from standard to high-availability applications.

Submersible hydrostatic level transmitter for reliable liquid level measurement in open tanks, channels, dams, wells, and other demanding applications.

The SITRANS P320/P420 combines high accuracy, fast response, and advanced diagnostics with remote access to safety-related functions. Users can read values, configure devices, perform maintenance, and support SIL workflows from the control room, reducing field visits, downtime, and exposure in hazardous areas.

With proof-test intervals of up to 15 years, guided commissioning, and clear diagnostics, these transmitters reduce maintenance effort, downtime, and total cost of ownership.

High accuracy, fast response time, and a rugged design ensure stable measurements in the chemical, petrochemical, and other demanding industries where safety is critical.

Covers gauge, absolute, and differential pressure, and supports level, volume flow, and mass flow measurement. This flexibility allows you to use a single transmitter family for a wide range of process tasks.

Up to 0.065 % for SITRANS P320 and up to 0.04% for SITRANS P420

From 10 mbar to 700 bar, depending on the version and measuring cell

Response Time & Long-Term Stability

Down to 105 ms and ≤ 0.125 % per 5 years

ATEX, IEC EX, FM, CSA, NEPSI, and others

Safety, Diagnostics, and Operating Conditions

IEC 61508 for SIL 2/3 applications, diagnostics in accordance with NAMUR NE107, and measured medium temperatures ranging from –40° to +100°C

4 to 20 mA with HART, PROFIBUS PA, FOUNDATION Fieldbus

Remote Safety Handling enables remote configuration, maintenance, and SIL validation from the control room, reducing exposure in hazardous areas and shortening the commissioning process. Proof-test intervals of up to 15 years help optimize maintenance efforts, while easy access to measurement data simplifies the operation of pressure and temperature devices without time-consuming field visits.

SITRANS P420 offers onboard storage of process values and trend recording for up to 1,500 measured values. This provides users with deeper insight into process behavior and supports optimization and maintenance decisions. It enables better monitoring of trends over time, helps detect deviations early, improves transparency, and supports more informed service planning and process optimization throughout the plant.

A large display and four buttons enable simple local setup and operation. Diagnostics in accordance with NAMUR NE107 provide clear device status information, helping users identify issues faster and plan maintenance more efficiently. SITRANS IQ Guard provides 24/7 transparency across process integration, verification, diagnostics, and continuous monitoring of field devices and process values.

The transmitter uses an innovative three-barrier design. If two barriers fail and the sensor is damaged, an alarm is triggered, while the third barrier helps prevent gas from escaping. This high level of protection is designed for hazardous gas applications and helps enhance operational safety for personnel and equipment, even under extreme conditions such as overpressure or corrosion.

Accurate pressure measurements are critical to the entire separation process—two vessels, called columns, create a pressure difference that causes the nitrogen to separate from the oxygen.

The SITRANS P320 and P420 are digital pressure transmitters designed for a wide range of industrial measurement tasks. They measure gauge pressure, absolute pressure, differential pressure, level, volume flow, and mass flow in gases, vapors, and liquids. Designed for demanding applications, they feature robust materials, a wide operating temperature range, and options for different diaphragm materials and remote seals. This makes them a flexible choice for industries such as chemical, petrochemical, and environmental applications.

Both transmitters provide reliable pressure measurement, easy commissioning, and robust performance. The key difference is that the SITRANS P420 offers higher accuracy and additional digital features, including trend recording with storage of up to 1,500 measured values directly in the device. This makes the P420 a particularly attractive choice for customers seeking enhanced diagnostics and digitalization capabilities.

The SITRANS P320 and P420 are designed to simplify setup, operation, and maintenance. Features such as guided commissioning, automatic zero-point calibration, and Remote Safety Handling help reduce on-site effort and speed up commissioning. In addition, proof test intervals of up to 15 years can help lower maintenance costs and increase plant availability.

Yes. The SITRANS P320 and P420 are designed for safety-related applications and support SIL 2/3 requirements, depending on the specific system architecture and application design. A key benefit is Remote Safety Handling via SIMATIC PDM, which enables safety-related functions to be commissioned and validated remotely from the control room. This helps reduce on-site effort, shorten validation time, and improve efficiency during commissioning and maintenance.

Yes. With the new high-end 10 mbar measuring cell, the SITRANS P420 offers a turn-down ratio of 40:1. The smallest available measuring span is 0.25 mbar / 25 Pa / 0.1 inH₂O. This makes it particularly well-suited for applications in the power, glass, and chemical industries.

Yes, the SITRANS P320 and P420 pressure transmitters are designed to operate in harsh conditions thanks to their robust materials, covering a wide temperature range from –40°C to +100°C. The diaphragm is made of stainless steel, Hastelloy, tantalum, Monel, and gold, making it suitable for your most challenging applications.

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