Siemens S55720-S307 Multi-function Pressure Sensor

The Siemens S55720-S307, part of the QBE2103-P25 series, is a multi-function pressure sensor engineered for precise relative pressure measurements in neutral and slightly aggressive liquid and gaseous media. This active product offers a measurement range of 0 to 25 bar, outputting a 4-20 mA signal. Its robust and compact construction, coupled with high overload resistance and excellent long-term stability, ensures maintenance-free operation and reliable performance. The sensor is designed for high precision and temperature stability, making it unaffected by ambient temperature fluctuations. Its intended applications span HVAC systems, hydraulic, and pneumatic systems, including steam applications.

Product Specifications

| Specification          | Value                                           |

| :--------------------- | :---------------------------------------------- |

| Article Number         | S55720-S307                                     |

| Manufacturer Part No.  | QBE2103-P25                                     |

| Pressure Reading Type  | Relative                                        |

| Minimum Pressure       | 0 bar                                           |

| Maximum Pressure       | 25 bar                                          |

| Output Signal          | 4-20 mA (2-wire or 3-wire)                      |

| Media Compatibility    | Neutral and slightly aggressive liquids/gases   |

| Temperature Stability  | High                                            |

| Overload Resistance    | High                                            |

| Lifecycle Status       | Active Product                                  |

| Country of Origin      | Switzerland                                     |

| Net Weight             | 0.153 Kg                                        |

| Packaging Dimensions   | 15.40 x 8.90 x 4.00 cm                          |

Core Features & Market Positioning

The Siemens S55720-S307 distinguishes itself through its inherent maintenance-free design, attributed to its exceptional long-term stability. This feature directly translates to reduced operational costs and minimized downtime for industrial facilities. Its measurement accuracy remains unaffected by temperature variations, a critical advantage in environments with fluctuating thermal conditions. The sensor’s high overload resistance ensures durability and longevity, even when subjected to pressure spikes. Positioned as a high-precision, reliable solution, it caters to demanding applications where consistent and accurate pressure monitoring is paramount.

Key Application Scenarios

This multi-function pressure sensor is optimally suited for a variety of industrial and building automation applications. It finds extensive use in HVAC plant operations for monitoring relative pressure within hydraulic and pneumatic systems. Its compatibility with steam applications further broadens its utility. Sectors requiring precise pressure control, such as manufacturing, process industries, and facility management, benefit significantly from the S55720-S307’s robust performance and accuracy.

Practical System Integration Guidance

Integrating the Siemens S55720-S307 into existing systems is streamlined due to its standard 4-20 mA output, compatible with a wide range of PLCs and control systems. For optimal performance and longevity, installation should ensure that the pressure connection nipples are pointed downwards to prevent condensation buildup within the sensor, especially in applications where moisture may be present. Following national safety regulations and employing appropriate wiring diameters, as per local codes, is crucial for safe and reliable operation. While specific programming examples are dependent on the target control system, the 4-20 mA signal is a widely understood and implemented standard.

Operation and Risk Mitigation

The Siemens S55720-S307 is designed for straightforward operation, primarily focused on providing accurate pressure readings. Risk mitigation primarily involves correct installation and adherence to operational parameters. Condensation within the sensor can lead to damage, thus proper orientation (nipples down) is critical. Users should be aware of the environmental limitations, particularly concerning media compatibility; while it handles neutral and slightly aggressive liquids and gases, highly corrosive substances are outside its scope. Standard electrical safety precautions, including proper grounding and insulation, should always be observed during installation and maintenance.

Scalability & Long-Term Value

While the S55720-S307 is a specific model, Siemens' broader portfolio offers a range of pressure sensors that can accommodate evolving system requirements. Its robust design and high-quality construction contribute to a long service life, offering excellent long-term value. Integration into modern IIoT platforms is typically achieved through standard data acquisition interfaces connected to the control system that interprets the 4-20 mA signal. This allows for remote monitoring and data analysis, enhancing overall system efficiency and enabling predictive maintenance strategies.

Frequently Asked Questions

What is the primary function of the Siemens S55720-S307?

The Siemens S55720-S307 is designed to measure relative pressure. It is suitable for neutral and slightly aggressive liquids and gases.

It provides a standard 4-20 mA output signal for easy integration. This allows for accurate data transmission to control systems.

This sensor is commonly used in HVAC and pneumatic systems. Its robust build ensures reliable performance.

What are the key technical specifications of the S55720-S307?

This sensor measures pressure from 0 to 25 bar. It offers high temperature stability and overload resistance.

The output signal is a 4-20 mA current loop. This ensures robust signal transmission over distance.

It is an active product, manufactured in Switzerland, and is designed for maintenance-free operation.

What types of media can the Siemens S55720-S307 sensor handle?

The sensor is rated for neutral and slightly aggressive liquids and gases. This broad compatibility covers many industrial applications.

It is important to avoid highly corrosive or aggressive media. Such materials can damage the sensor's internal components.

For specific media compatibility queries, consulting Siemens' detailed documentation is recommended.

How is the Siemens S55720-S307 installed?

Install the sensor with pressure connection nipples pointing downwards. This orientation prevents internal condensation damage.

Ensure all electrical connections are made according to safety standards. Use appropriate wire gauges for the current.

Mount the sensor securely in its intended location within the system. Proper mounting ensures stability and accurate readings.

What is the output signal of the S55720-S307 sensor?

The sensor provides a 4-20 mA current output signal. This is a standard analog signal used in industrial automation.

This 4-20 mA signal is proportional to the measured pressure. It allows for precise control and monitoring.

The output can be configured for 2-wire or 3-wire configurations depending on system requirements.

What are the main advantages of using the Siemens S55720-S307?

Its key advantage is being maintenance-free due to excellent long-term stability. This reduces operational costs.

The sensor offers high precision and is unaffected by temperature changes. This ensures reliable readings in varying environments.

Its robust construction and high overload resistance contribute to a long service life and operational durability.

In which industries or applications is the S55720-S307 typically used?

It is widely used in HVAC systems for monitoring pressure. This includes hydraulic and pneumatic applications.

The sensor is also suitable for steam applications, adding to its versatility. General industrial process monitoring is another key area.

Its accuracy makes it valuable in control loops requiring precise pressure feedback.

Does the Siemens S55720-S307 require calibration?

The sensor is factory calibrated and temperature compensated. This ensures accuracy upon installation.

While factory calibrated, periodic checks may be advisable in critical applications. Zero-point adjustment is available for fine-tuning.

The device's long-term stability minimizes the need for frequent recalibration.

What is the pressure range of the S55720-S307?

The sensor measures relative pressure within a range of 0 to 25 bar. This covers a significant spectrum of industrial pressure needs.

This range is suitable for many HVAC and general industrial applications. It provides ample headroom for typical operating pressures.

Ensure your application's maximum pressure does not exceed this limit to prevent sensor damage.

Can this pressure sensor be used for differential pressure measurement?

No, the S55720-S307 is designed for relative pressure measurement. It measures pressure relative to atmospheric pressure.

Differential pressure sensors are a different product category. They measure the difference between two pressures.

For differential pressure applications, Siemens offers specific sensors like the QBE3000-D1 or QBM series.