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There are currently two combustible gas detectors; the on-site readings show 0, the current measurement is 4 mA, while the readings on the host computer are 4.8 and 9.02. The card channels have also been replaced, but the readings remain unchanged. I would like to ask what’s going on here?
Three-wire combustible gas alarm? If so, carefully check whether the signal lines and common terminals are connected correctly.
You must have measured 4MA on-site; this only indicates that there is nothing wrong with the combustible gas alarm itself. You also need to check on the side of the card whether the incoming current is 4mA. It’s possible that the wires are connected incorrectly What if the safety barrier is broken? Check carefully and avoid taking things out of context.
It works normally after replacing the third channel.