i wish to know more about deferential pressure transmitter

[nyame]

Hello everyone.

Please what are the common faults differential pressure indicating transmitter can develop why in service and what are their troubleshooting technics or remedy ?

Please same question goes for magnetic level transmitter, radar level transmitter, temperature transmitter, and ultrasonic flow meter

will appreciate any contribution
Thanks

[SeanB]

Normal things are overpressure, either the differential side, or common mode, causing either non linearity, or simply bursting the diaphragms or the silicon sensors. Also blocked with dirt on the ports, or they have been exposed to corrosive gases or liquids, and are destroyed.

Otherwise if they use mechanical readout, wiper on a resistive track, very old units or very cheap ones, the mechanical parts wear out. Normally the electronics is reliable, mostly either potted or conformal coated, and most also have reasonable protection against reverse connection, but you can still blow the electrical side up connecting to wrong supply voltages or incorrect voltage due to cable faults.

[SmallCog]

All of the above

In my experience they tend to under read in the upper part of their measuring range as they age. We expect no more than 5 years life out of a pressure sensor.

Problems with radar include false reading from thing like floating material. A log floating under a sensor in a flooded river can look like a tsunami to someone looking at very raw data.

Even ducks can show up in raw data.

I’ve heard hydrographers refer to radars as producing “noisy” data however they’re actually seeing all the ripples in the surface of the water.

Which style of ultrasonic flow meter were you interested in?

Fault finding is the same for all for our field staff, if the reading is incorrect swap it for a spare and let our instrument techs check it over unless there’s an obvious issue (eg fouling) that can be dealt with and the reading return to the expected number.

99% of our sensors are “smart” sensors which we interrogate using Modbus or SDI-12 to get away from all the downsides of analogue sensors.