4-20 switch

R

Thread Starter

RHB

Does anyone make a switch that auto transfers a 4-20 ma signal from a second signal 4-20 ma if the main source fails ?
 
Perahaps a simple relay with a couple of change-over contacts should suffice. If you can give more details, it will be helpful.
Kamath RL
 
G

Gerald Moore

I would just monitor both and make sure the readings never drift outside a calculated tolerance. If they do then one of them must have failed. But, how do you know which one? Which brings the question:

How are you determining what qualifies as a failure? Please, give more info!

Gerry
 
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