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Honeywell TR21-A Temperature Sensor-Average 10KOhm

Special Price $43.11 Regular Price $56.04
In stock
The Honeywell TR21-A is a temperature sensor designed for use in HVAC equipment. It measures temperature by detecting changes in the electrical resistance of a thermistor component within the sensor. As the temperature rises, the resistance decreases. With an average resistance of 10,000 ohms at 25°C and a high beta value, the sensor offers accurate temperature readings (within ±0.2°C) over a wide range. It can also trigger an alert if the temperature exceeds a user-defined setpoint (120°C in this example). This allows HVAC systems to maintain consistent temperatures, improving comfort and energy efficiency for buildings. The sensor's wide voltage range (5-24V) ensures compatibility with various HVAC control systems.


  • Weight:0.23lbs
  • Temperature:120°C
  • Accuracy: ±0.2°C
  • Resistance: 10KOhm
  • Beta Value: 3977K
  • Voltage: 5-24V
Manufacturer Name: Honeywell
Product Number: TR21-A
OEM Part Number: TR21-A
Product Description: 10K Ohm Temp Sensor-Averg Only

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