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Industrial, 4-20 mA current loop, measuring circuits

Basics of The 4 - 20mA Current Loop ~ Learning
The current flowing through R produces a voltage that is easily measured by the analog input of a controller. For a 250 ohm resistor, the voltage will be 1VDC at 4mA and 5VDC at 20mA. As the diagram above shows, there are four basic components in the 4-20mA current loop namely: (a) The power supply (b) The 2-Wire Transmitter[PDF]
Walchem Webmaster 4-20ma Input Wiring Guide Walchem
Walchem Webmaster 4-20ma Input Wiring Guide Walchem Corporation, Holliston, MA CJ 6/14/07 1. The (-) Minus terminal is the signal input. The 4-20ma signal goes here. 2. The (+) Plus terminal is a +24vdc power supply for the transmitters. 3. The GND terminal is the return for completing the circuits, both signal and power. 4.[PDF]
3 Troubleshooting a 4-20mA loop - Devar Inc.
Troubleshooting a 4/20mA loop Page 3 of 4 power supply, malfunctioning electronics, etc aren’t part of troubleshooting a 4/20mA loop, unless the loop is being powered by a supply that is part of the indicator and one can continue by repairing the indicator to resolve these issues. Problems with transmitters usually occur because of wiring
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