HVAC SENSOR, HVAC/R SENSORS, HVAC SENSOR HK INSTRUMENTS, TEMPERATURE SENSOR HK INSTRUMENTS, HUMIDITY SENSOR HK INSTRUMENTS.

Temperature Sensors
To maintain a preset air temperature, an HVAC system will typically have one or more interior air temperature sensors, an ambient (outside) air temperature sensor.

Most air temperature sensors have a “negative temperature coefficient,” which means they lose resistance as the temperature goes up. A simple way to check this type of sensor is to use a blow dryer to heat the sensor. The resistance should drop as the sensor warms up.

Ambient air temperature sensors typically have a slow sample rate to even out variations in readings that may be sensed at different vehicle speeds. 

Humidity Sensors
Humidity sensors are capacitance sensors that measure the amount of moisture in the air. From the data delivered by the humidity and temperature sensor, the HVAC system calculates the dew point temperature of the air. The performance of the sensor can degrade over time and cause the sensor to malfunction and give false readings.

Air Quality Sensor
Air quality sensors can prevent harmful gases and unpleasant odors.