Temperature Sensor DANFOSS QT 35–50°C, model 003Z0397

DANFOSS QT temperature sensor model 003Z0397 measures and monitors temperatures in the 35–50°C range. Designed for HVAC and industrial control applications, this sensor provides stable analog temperature feedback suitable for integration with controllers, thermostats, safety cut-offs and monitoring equipment. The compact sensor fits into heating circuits, boilers and pump systems to help maintain process temperatures and trigger control actions where precise mid-range temperature detection is required.

Advantages

The sensor offers reliable and repeatable temperature detection within the specified range, with a design that supports straightforward installation in heating and pump systems. It provides compatible feedback for common control devices and safety interlocks, enabling accurate regulation and protection of equipment. The construction is intended for typical HVAC and industrial environments where a focused 35–50°C sensing window is required.

Suitable for

• Temperature monitoring in heating circuits and boilers
• Feedback input for controllers and thermostats
• Pump system temperature supervision
• Safety cut-off or alarm activation at defined mid-range temperatures

When it may not be suitable

This sensor is calibrated for the 35–50°C range and is not appropriate for applications requiring measurement below 35°C or above 50°C, where accuracy and response may degrade. It is also not intended as a precision laboratory instrument for high-accuracy scientific measurements outside its specified range.

Key specifications

• Measuring range: 35–50°C
• Application scope: HVAC and industrial control environments
• Output: temperature feedback suitable for controllers and thermostats (analog type dependent on system)
• Typical mounting: integration into heating circuits, boilers and pump systems
• Operating environment: designed for standard heating system conditions

How to use

Install the sensor at the point where representative medium temperature is required, for example in a sensor pocket or a designated mounting point in a heating circuit or boiler. Connect the sensor wiring to the controller or thermostat according to the receiving device’s input requirements and wiring diagram. After mechanical and electrical installation, verify correct operation by comparing readings against a reference or by observing controller behaviour across the operating range. Follow local electrical and mechanical safety rules during installation and commissioning.

What to consider before purchase

• Ensure the required measurement range (35–50°C) matches your application needs
• Confirm compatibility of the sensor’s output type with your controller or thermostat input
• Verify suitable mounting provisions (sensor pocket, insertion length or mounting point) in the system
• Check environmental conditions to ensure the sensor design matches expected temperatures and medium

Usage recommendations

For reliable performance, install the sensor where it senses the process medium directly and minimize thermal bridges to surrounding structures. Periodically verify sensor readings as part of routine maintenance and replace if readings drift outside acceptable limits.