The resistance of NTC Thermistor will increase as environment temperature decreases; otherwise, the resistance will decrease while temperature increases. With high sensitivity of thermal, NTC Thermistor is applied to variety of fields such as temperature measurement and temperature compensation.

TEMPERATURE COMPENSATION

LCD, GPS, Cellular phone, Inkjet printer

TEMPERATION MEASUREMENT

Household appliances, Cellular phone battery, NB battery, Electric vehicle battery, Medical instrument, Solar-powered water heater, Air conditioner, Freezer, motor vehicle, Copier, Fax, Electronic thermometer, Electronic oven, Electronic pot, Microwave oven, Electric Boiler & Warmer, Dryer, Electric iron, Electric blanket, Gas heater, Oil heating furnace

The fundamental principle is to utilize that NTC Thermistor has different thermal dissipation factors between different mediums. When the power generated internal to NTC Thermistor from current flow is enough to raise the body temperature of the thermistor above that of its surroundings. The thermal will conduct to surroundings, and then the balanced temperature will depend on the medium type.

LIQUID LEVEL MEASUREMENT

Automotive electronics
(measuring the level of oil or water)

AIR FLOW VELOCITY VACUUM AND HUMIDITY MEASUREMENT

Air flow velocity meter, Vacuum gauges, Humidity meter, Gas analyzer

NTC Thermistor placed on the side of Wheatstone bridge (as shown below) can be applied to temperature sensing. When the bridge is balanced, the resistance value of NTC thermistor will change with temperature variations. Therefore, the current obviously flows through an ammeter. The application circuit of NTC thermistor and microcontroller is shown as below.