Home » Signal Conditioners & Network I/O » 4-20 mA Signal Isolators » 4-Wire AC/DC-powered Isolators
These isolators provide 3-way isolation to separate input, output, and power circuits. They are the safest choice when retrofitting or expanding systems where instrument isolation or the grounding schemes are unknown. These 3-way isolators source current out and do not utilize a separate output power supply. The outputs are designed to drive purely resistive loads. The isolator can be located several or hundreds of feet away from the PLC/DCS and obtain power from an external AC or DC source. This source may have a different ground potential than the PLC/DCS or field device. In this case, the power ground must be isolated from both the input and output. Across long distances, the ground potential at a sensor is likely different from the power source and PLC/DCS. Consequently, input to output isolation is also necessary. Additionally, these units can isolate 4-20mA control outputs from the PLC/DCS to field actuators. In the case of analog outputs, the PLC/DCS output is wired to the isolator input and the isolator output is wired to the field device/actuator.

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    631T, 632T: Single / Dual Channel Isolator

    • 4 to 20mA DC input
    • 4 to 20mA DC output
    • 12-36V DC SELV, 90-250V AC power
    • Single or dual I/O with a dual output model and full isolation
    These units receive 4-20mA process current inputs and provide isolated 4-20mA output signals. Each channel operates independently and is isolated from the others to prevent interaction between channels. Galvanic isolation eliminates ground loops, reduces noise, and blocks transient signals.
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