Siemens S55720-S175 SITRANS P Series Pressure Sensor
The Siemens SITRANS P Series pressure sensor, specifically the S55720-S175 model, stands as a robust solution for demanding industrial applications requiring precise and reliable pressure measurement. Engineered for accuracy and durability, this sensor offers a remarkable measuring range of up to 40 bar, a standard output signal of 4-20 mA with HART communication, and operates within a wide temperature range of -40°C to +85°C. Its stainless steel process connection and diaphragm ensure excellent media compatibility and longevity in corrosive environments, while its high accuracy of 0.1% of span and 3-year warranty underscore its commitment to quality and performance. The S55720-S175 is designed for straightforward integration, featuring a G1/2" male process connection for widespread compatibility and an IP67 protection rating for resilience against dust and water ingress, making it a compelling choice for various process industries.
Product Specifications
| Parameter | Specification |
| :--------------------- | :----------------------------------------------- |
| Model | Siemens SITRANS P Series S55720-S175 |
| Measuring Range | Up to 40 bar |
| Output Signal | 4-20 mA with HART |
| Process Connection | G1/2" Male |
| Diaphragm Material | Stainless Steel |
| Accuracy | 0.1% of span |
| Operating Temperature | -40°C to +85°C |
| Ingress Protection | IP67 |
| Warranty | 3 years |
| Communication Protocol | HART |
Core Features & Market Positioning
The Siemens S55720-S175 SITRANS P pressure sensor distinguishes itself through its advanced HART communication capabilities, enabling remote diagnostics and parameterization, which significantly reduces operational overhead and downtime. Its robust stainless steel construction, including the diaphragm, provides superior resistance to harsh chemicals and high pressures, positioning it as a premium choice for critical process control where reliability is paramount. Compared to competitors, the combination of high accuracy (0.1% of span) and an extended operating temperature range (-40°C to +85°C) offers a distinct advantage in challenging environments, from petrochemical plants to water treatment facilities. The inherent durability, evidenced by its IP67 rating, ensures consistent performance even in dusty or wet conditions, a testament to Siemens' engineering prowess in the industrial instrumentation market.
Key Application Scenarios
This Siemens SITRANS P pressure sensor finds extensive use across numerous industrial sectors due to its versatile capabilities. In the oil and gas industry, it is crucial for monitoring wellhead pressure, pipeline integrity, and process fluid levels in refineries. For chemical processing, the S55720-S175 is deployed to accurately measure pressures in reactors, storage tanks, and transfer lines, especially where corrosive media are present, thanks to its stainless steel wetted parts. The water and wastewater treatment sector relies on this sensor for monitoring pump discharge pressures, filter status, and tank levels. Furthermore, its robust design makes it suitable for demanding applications in the food and beverage industry, where hygienic processing and reliable pressure readings are essential for quality control.
Practical System Integration Guidance
Integrating the Siemens S55720-S175 SITRANS P pressure sensor into existing systems is streamlined due to its standard G1/2" male process connection, allowing for direct mounting in many common manifold or flange arrangements. For electrical connections, the sensor typically utilizes a standard M12 connector or terminal block, requiring a 2-wire connection for the 4-20 mA signal. The HART protocol, superimposed on the analog signal, necessitates a compatible HART modem or a HART-enabled control system (like a DCS or PLC) for digital communication. Configuration of parameters such as range, units, and HART address is conveniently performed using Siemens' SIMATIC PDM software or other HART-compatible handheld configurators, enabling precise calibration and diagnostics without interrupting the process signal.
Operation and Risk Mitigation
Operating the Siemens S55720-S175 SITRANS P pressure sensor involves ensuring it is correctly installed within its specified pressure and temperature limits to prevent over-ranging or material degradation. Regular checks of the HART communication status via diagnostic software can preemptively identify potential issues, such as drift or sensor faults, before they impact the process. While the sensor boasts an IP67 rating, ensuring that cable connections are properly sealed and that the housing is not subjected to excessive mechanical stress is crucial for maintaining ingress protection. In case of a fault, the HART protocol often provides specific diagnostic codes, such as "digital output error" or "device malfunction," which, when correlated with physical inspections of the process connection and wiring, aid in rapid troubleshooting and minimize operational risks.
Scalability & Long-Term Value
The Siemens S55720-S175 SITRANS P pressure sensor offers significant long-term value through its compatibility with Siemens' broader automation portfolio and its adherence to open communication standards like HART. This ensures seamless integration with modern Distributed Control Systems (DCS) and Programmable Logic Controllers (PLCs), facilitating straightforward upgrades and expansions of process control infrastructure. The HART protocol not only enables advanced diagnostics for predictive maintenance, reducing unplanned downtime, but also paves the way for future integration into Industrial Internet of Things (IIoT) platforms. By providing a reliable foundation for accurate pressure measurement, the S55720-S175 supports operational efficiency and data-driven decision-making, enhancing the overall scalability and profitability of industrial operations over its extended lifecycle.
Frequently Asked Questions
What is the accuracy of the Siemens S55720-S175 SITRANS P pressure sensor?
The Siemens S55720-S175 offers a high accuracy of 0.1% of span. This precision ensures reliable process control. This level of accuracy is critical for demanding industrial applications.
This specification means very small pressure variations can be detected. It is ideal for sensitive process adjustments. Users can trust the sensor for critical measurements.
Achieving this accuracy across its operating range highlights its robust design. It is built for consistent, dependable performance. This reduces the need for frequent recalibration.
What is the maximum pressure range for the S55720-S175?
The Siemens S55720-S175 can measure pressures up to 40 bar. This range is suitable for many industrial applications. It covers moderate to high-pressure environments.
This maximum rating allows for flexible deployment. It can be used in pipelines, reactors, and storage vessels. Users do not need to switch sensors for varying pressures.
Exceeding this limit can damage the sensor. Always ensure the process pressure stays within the specified range. Consult the manual for detailed overpressure protection.
How does the HART communication feature benefit users?
HART communication allows remote configuration and diagnostics. Users can adjust settings without physical access. This saves significant time and effort.
It enables advanced troubleshooting capabilities. Diagnostic messages can be sent and received. This helps identify issues before they cause downtime.
HART also allows for digital data transmission. This enhances the accuracy and reliability of measurements. It integrates well with modern control systems.
