Siemens Building Technology 535-431B Transmitter

The Siemens 535-431B is a precision-engineered analog temperature transmitter designed for high-accuracy sensing within building automation and HVAC systems. Built for durability in commercial environments, this 4-20mA temperature transmitter converts signals from an integrated or remote sensing element into a standard linear output, ensuring seamless integration with Siemens Building Technologies controllers and third-party BAS platforms. It features a calibrated range of 20 to 120 degrees Fahrenheit, making it ideal for discharge air monitoring and return air sensing applications. The unit utilizes a two-wire, loop-powered configuration, simplifying field installation by reducing wiring overhead. By maintaining a 100 ohm platinum RTD or similar high-grade sensing input, the 535-431B provides the thermal stability and long-term signal integrity required for precise environmental control. For technicians servicing legacy systems or modernizing mechanical rooms, this Siemens HVAC transmitter offers a reliable, industrial-grade solution for critical temperature feedback loops.

• Scalable 4-20mA Output: Ensures compatibility with standard PLC and DDC inputs, minimizing signal degradation over long wire runs.
• Wide Operating Range: The 20°F to 120°F span covers the majority of indoor climate and air handling unit requirements.
• Simplified Two-Wire Loop: Reduces labor costs during installation and simplifies troubleshooting within existing control cabinets.
• Industrial Build Quality: Designed to withstand the electrical noise and vibration common in mechanical equipment rooms.

Common Technical Questions

What is the output signal if the sensor fails?
The 535-431B typically defaults to an upscale or downscale signal depending on the specific loop configuration, allowing your controller to trigger a safety alarm or shutdown sequence.

Can this transmitter be used with non-Siemens controllers?
Yes, as a standard linear 4-20mA device, it is compatible with any controller capable of scaling a milliamps signal within the 20-120F range.

Does this unit require a separate power supply?
This is a loop-powered device, meaning it draws its operating power directly from the 24VDC signal loop provided by the controller.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.