The micro motion mass flow meter cannot communicate with HART475 after being in operation on-site for half a year
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For a four-wire mass flow meter, the flow signal from the field is fed into a penless recorder; both wires of the signal line are disconnected, a 250-ohm resistor is connected to the signal terminals, and then HART communication is disabled for these two terminals. Device not found. The transmitter of this mass flow meter is model 1700. When this mass flow meter was first purchased, we were able to use HART communication. To determine whether there was a wiring error, I tried using the same wiring method with a new mass flow meter of the same model, and found that communication was possible. I also tried other HART protocol instruments to see if they could communicate as well. It’s this one that doesn’t work; I’m quite confused. Please, experts, help me figure it out
This post was last edited by fengyun168 on 2011-7-4 at 11:00. It’s possible that the HART communication port has been damaged due to lightning strikes; it is recommended that the 1700 transmitter use 485 for communication. A laptop with a serial port, along with the PROLINKII software, can be used to handle and diagnose issues conveniently, especially for viewing historical fault records and graphs.
I don’t think what was said upstairs is correct. If it is the output terminal that has been damaged by lightning, then there should also be problems with the analog signal. It’s just a HART communication issue at the moment; it’s possible that there’s a problem with the HART communication module inside the instrument. Try restoring the device to its factory settings; it might help.
Reply to 4# qugd: I agree with your view. How can I restore the factory settings?
My HART device did cause them to have issues; they changed the entry conditions to input tag numbers, which meant that no instruments could be connected at first. After I changed it to an address, the other instruments worked fine, but this one still didn’t function.
Reply to 5# slayerstar: I’m just making an educated guess; you may need to check certain contents in the instrument operation manual, and you might even need an access password.
Reply to 5# slayerstar: I am only making judgments about this type of fault based on experience; I don’t have any specific knowledge regarding the procedures to take. Please refer to the relevant manuals or consult the technical staff at MM.
It’s a shame if the micro motion mass flow meter uses analog signals for measurement; it would be better to use pulse signals. Additionally, laptops are used nowadays for handling such tasks as they are simple and straightforward. It is recommended that the manufacturer develop software for this purpose and provide some basic training.