A temperature transmitter allows industry standard temperature sensors to be directly connected to PLC 4.20mA inputs and industrial IO modules. The 4.20mA temperature transmitter connection is a standard format in industrial measurement and control systems. The 4.20mA signal allows the temperature sensor measurement to be run much further than the direct connection of the temperature sensor itself. 4.20mA signals can be run directly for thousands of feet, when using the correct cable and power supply. Many PLC inputs either standardly or optionally can be configured for 4.20mA, and it is not unusual to find spare inputs in an installation.