NTC 4-20mA signal conditioning allows industry standard NTC Thermistors to be directly connected to PLC 4-20mA inputs and industrial IO modules. The NTC 4-20mA Thermistor connection is a standard format in industrial measurement and control systems. The 4-20mA signal allows the NTC measurement to be run much further than the resistive connection of the thermistor 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
Example 4-20mA thermistor transmitter wiring diagram A Simple 4-20mA Transmitter Operation Description The 4-20mA transmitter can be looked at as a temperature controlled variable load. It is in series with the power supply and current measurement shunt resistance. The effect is similar to the transmitter acting like a potentiometer. One that will vary total load …
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4-20mA SENSOR TRANSMITTERS READ SENSORS WITH YOUR PLC Use spare PLC 4-20mA inputs for sensor measurement, with ROI-XMA transmitters. ROI-XMA sensor transmitters allow the simple measurement of industry standard sensors. Existing sensors can be connected to modern control systems. Read Thermistors, RTDs, or Potentiometers with a PLC. ROI-XMA 4-20mA sensor transmitters are a simple way to …