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
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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
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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
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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