Aoniuba flow meter
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The Aniuoba flow meter keeps showing -999. What’s going on?
Are the positive and negative pressure pipes connected in reverse or is the flow direction reversed?
What is the diameter, and what is the maximum pressure difference? It would be best to send over the piping diagram for pressure measurement
You’ve provided too little information: it’s not clear whether the display is on the instrument itself or on a host computer, what is being measured, and neither the installation method nor anything else is specified. I guess it’s likely that the host computer shows -999; if that’s the case, check what the situation is on-site first before proceeding
If the instructions were correct in the past, this is a new phenomenon; check whether there are leaks in the piping and whether the differential pressure transmitter is functioning properly
With just this information, figure it out by yourself.