Mass flow meter
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Emerson mass flow meter, 375 – no communication, emergency!
If the handheld controller is in good condition, and the wiring was originally set with the negative pole in series, try changing it to use the positive pole in series. If it still doesn’t work, call the manufacturer for assistance
Is it because the Hart version is too low?
Check your model to see if it has the HART function; this function is not standard
For the Hart communication, I think those two terminals need to be powered separately, right?
It’s those two terminals you use for communication. What’s your model? I’ll check it in a moment
For 4-wire systems, a 250Ω resistor must be connected in parallel!
With HART protocol, is your mass flow meter four-wire or two-wire?