A common method of measuring motor temperature is with RTD's (resistance temperature detectors). In this application, a Transpak T797-0000, a Visipak V560 Loop-Powered Indicator, and a PLC are used to measure and control temperature over a long distance.

An RTD is connected to the motor in accordance with the manufactures documentation. This RTD is connected to the input of the T797. The T797 is an extremely versatile, PC or display configurable, 2-Wire Transmitter and will accept 2, 3, or 4 wire RTD's. Two-wire Transmitters are selected when a minimum of wiring is desired and the 4-20mA signal is transmitter over a long distance. A V560 indicator is connected in series with the 4-20mA loop providing a local temperature readout. A PLC is located off site and may be used to control the load to the motor or to shut down the motor as needed to prevent burnout.