You can’t always plan for every loop condition when starting your facility up. Sometimes input cards are active and sometimes passive. Transmitters are sometimes line powered (four-wire) which usually have active outputs, and sometimes they are passive (two-wire). Did the contactor install the right input cards on the PLC? Does the building automation system read HART input?
When those unplanned situations exist, you can turn to the HIT HART Pass-through Signal Isolator. The HIT isolator provides superior noise rejection and full three-way isolation with HART pass-through capability. Another very important feature of the HIT that is that the output will track the input all the way to 0mA when it fails; as opposed to most other isolators that simply go to 4mA – which is always difficult to ascertain between a failure of the input or just 0% scale. Lastly, the HIT can be used on non-HART or HART based loops when asset managers need that valuable diagnostic and calibration data.
- Class I Div 2/Zone 2 approval
- HART pass-through capability
- Output tracks to 0mA on failed input