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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    TT336: Current / milliVolt Input, DC Power Transmitter

    • Multi-range ±20mA or ±500mV input
    • Universal current/voltage output
    • 12-32V DC power
    DC current and voltage output are both supported on a single model. An optional DIN rail bus can deliver primary or redundant power to multiple units without wiring. Click here to watch a short video highlighting the TT330 Series.
    $265
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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.
    $250$385
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    330i: DC-Powered Isolator

    • 4 to 20mA DC input
    • 4 to 20mA DC output
    • 10-36V DC power
    • Three-way isolation
    $460
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    430i: AC-Powered Isolator

    • 4 to 20mA DC input
    • 4 to 20mA DC output
    • 115V AC or 230V AC power
    • Three-way isolation
    • Zero and span adjustment enable precise calibration
    $460
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