Negative Temperature Coefficient (NTC) Thermistor.ġ6.Positive Temperature Coefficient (PTC) Thermistor. ![]() They’re made of metallic oxide that’s been molded into a bead, disc, or cylindrical shape, then covered in epoxy or glass. It is a kind of resistor whose resistance is proportional to the temperature. The term thermistor is derived from “thermal” and “resistor”. Power and data signal is always directly proportional to the common ground in a 3-wire transmitter but in a 4-wire transmitter, there is a dedicated 2- wire each for both the power supply and data signalsġ1. ![]() Difference between 2 wire, 3 wire, and 4 wire transmitters.Ī 2-wire transmitter transmits both power and signal over a single cable. The amount of change in the material’s resistance value caused by a per degree increase in temperature is measured, and the sensor is calibrated accordingly.ġ0. The relationship between the resistance and temperature of the metal is the working principle of RTD, which means that the resistance of a metal varies with temperature. RTDs are sensors used to measure temperature RTD stands for Resistance Temperature Detector.
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