Siemens S55720-S182 Industrial Pressure Switch
The Siemens S55720-S182, also known by its model number QBE3100-D4, is a robust industrial pressure switch engineered for precise differential pressure measurement in a wide array of applications. This device excels in monitoring liquids and gases, offering a reliable 4-20 mA analog output signal. Its core advantages lie in its durable construction, suitability for slightly aggressive media, and straightforward integration into existing control systems. Key technical parameters include an operating voltage of DC 11-33V, a measuring range of 0-4 bar (0-400000 Pa), a maximum permissible pressure of 25 bar, and an IP65 degree of protection, ensuring reliable performance even in demanding industrial environments.
Siemens S55720-S182 Industrial Pressure Switch: Product Specifications
| Feature | Specification |
| :---------------------- | :------------------------------------------ |
| Article Number | S55720-S182 |
| Model Name | QBE3100-D4 |
| Product Description | Differential pressure sensor for liquids and gases |
| Output Signal | 4-20 mA |
| Pressure Range | 0-4 bar (0-400000 Pa) |
| Operating Voltage | DC 11-33 V |
| Max. Permissible Pressure | 25 bar |
| Medium Temperature | -15 to 80 °C |
| Pressure Connection | Internal thread G 1/8" |
| Electrical Connection | Plug-in connection |
| Degree of Protection | IP65 |
| Dimensions (W x H x D) | 67 x 143 x 40 mm |
| Suitable Media | Slightly aggressive liquids and gases |
| Not Suitable For | Ammonia or freones |
| Warranty | 60 Months |
Core Features & Market Positioning
The Siemens S55720-S182 stands out in the competitive industrial sensor market due to its combination of precision, durability, and versatility. It is specifically designed for differential pressure measurement, making it a critical component in HVAC systems and building automation for monitoring flow rates and liquid levels. Its ability to handle slightly aggressive media further broadens its application scope beyond standard environmental controls. The 4-20 mA output signal is a universally recognized standard, facilitating seamless integration with PLCs and other control systems. This positions the QBE3100-D4 as a reliable, cost-effective solution for applications requiring continuous and accurate differential pressure monitoring.
Key Application Scenarios
This industrial pressure switch finds its primary utility in Heating, Ventilation, and Air Conditioning (HVAC) systems. It is employed for the continuous monitoring of liquid levels and flow rates, ensuring optimal system performance and energy efficiency. In building automation, the S55720-S182 acts as a crucial measured value transmitter, providing essential data for control strategies. Furthermore, its robust design and IP65 rating make it suitable for industrial process monitoring where differential pressure plays a role in controlling or verifying operational parameters. The sensor is also adept at monitoring filters and control fans, contributing to the overall health and efficiency of mechanical systems.
Practical System Integration Guidance
Integrating the Siemens S55720-S182 into an industrial control system is typically straightforward due to its standard G 1/8" internal thread connection and plug-in electrical connector. The sensor is supplied with a mounting bracket and screwed fittings for 6 mm copper pipes, simplifying the initial physical installation. For wiring, the 4-20 mA output requires a power supply within the DC 11-33V range and appropriate signal conditioning for the connected controller or PLC. When installing, ensure the pressure tapping points are clean and securely connected to avoid leaks. It is crucial to note that the sensor is not suitable for ammonia or freones, and care should be taken with media temperature, keeping it within the -15 to 80 °C range.
Operation and Risk Mitigation
Proper operation of the Siemens S55720-S182 relies on adherence to its specified operating parameters and media compatibility. The device is designed for differential pressure measurement within the 0-4 bar range. Overpressure is managed up to 25 bar, providing a significant safety margin. Risk mitigation involves ensuring the sensor is used with compatible liquids and gases and is not exposed to extreme temperatures outside its specified range. Damage due to improper use, unauthorized modifications, or failure to follow user instructions will void the warranty. Regular visual inspection for any signs of damage or leakage is recommended.
Scalability & Long-Term Value
While the S55720-S182 is a discrete component, its value extends through Siemens' broader ecosystem of industrial automation solutions. Its compatibility with standard 4-20 mA interfaces allows for integration with a wide range of PLCs and SCADA systems, supporting future upgrades or expansions of monitoring capabilities. Siemens offers a family of related pressure sensors (e.g., QBE3000-D series for 0-10V output) and accessories, providing a clear upgrade path or solution for different application requirements. The inherent durability and robust design of Siemens products contribute to a long service life, minimizing total cost of ownership.
Frequently Asked Questions
What is the primary function of the Siemens S55720-S182?
The Siemens S55720-S182, also known as the QBE3100-D4, is a differential pressure sensor. It measures the difference in pressure between two points in a system. This allows for monitoring of flow rates and liquid levels.
In which types of systems is the S55720-S182 commonly used?
This sensor is frequently deployed in HVAC systems for crucial monitoring tasks. It's also a key component in building automation for process control. Its versatility extends to various industrial applications requiring precise pressure differential measurements.
What are the key technical specifications of the Siemens S55720-S182?
It operates with a DC 11-33V supply and provides a 4-20 mA output. The pressure range is 0-4 bar, with a maximum permissible pressure of 25 bar. It features a G 1/8" connection and IP65 protection.
What media is the Siemens S55720-S182 suitable for?
This pressure switch is designed for neutral and slightly aggressive liquids and gases. It ensures reliable performance in many industrial fluid handling scenarios. However, it is not recommended for use with ammonia or freones.
What is the output signal type of the S55720-S182?
The Siemens S55720-S182 provides a standard 4-20 mA analog output signal. This is a widely adopted standard in industrial automation. It ensures compatibility with most PLCs and control systems.
What is the pressure measurement range of this device?
The Siemens S55720-S182 has a differential pressure measurement range of 0 to 4 bar. This is equivalent to 0 to 400000 Pascals. This range suits many common HVAC and industrial monitoring needs.
Does the Siemens S55720-S182 require special installation considerations?
Installation involves a G 1/8" threaded connection and usually includes a mounting bracket. Proper sealing of the connection is essential. It is designed for easy integration with standard pipe fittings.
What is the warranty period for the Siemens S55720-S182?
The Siemens S55720-S182 comes with a warranty of 60 months. This highlights Siemens' confidence in the product's durability and reliability. Extended warranty periods underscore its long-term value.
How does the S55720-S182 contribute to system efficiency?
By accurately monitoring differential pressure, it enables fine-tuning of HVAC and industrial processes. This leads to optimized energy consumption and improved system performance. It helps maintain desired flow rates and levels consistently.
What is the degree of protection for this pressure switch?
The Siemens S55720-S182 features an IP65 degree of protection. This rating ensures it is dust-tight and protected against water jets. It allows for reliable operation in harsh industrial environments.
