Honeywell Temperature sensor T7335D1123B

This item is a Honeywell NTC temperature sensor, SKU T7335D1123B. It operates on the negative temperature coefficient principle with an NTC sensing element. The device measures temperature and provides a resistance signal for use in control systems. It has fast response, high measurement accuracy, and high sensitivity. The sensor is built for an extended operational life.

Replacement NTC sensors of this kind are selected by their resistance characteristic at a reference temperature, commonly 10 kΩ or 12 kΩ at 25 °C, and by the probe form. Common probe types are immersion (screwed into the water path), clamp-on (strapped to a pipe), and sleeve-mounted. Cable length and connector type must also match the original installation, because incorrect fitment can cause reading errors.

Typical failures of this type of sensor include a drifting resistance that causes incorrect burner modulation. A broken cable and poor thermal contact between a clamp-on probe and the pipe surface are other common faults.