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INSTRUMENT FAILURE OR NOT?


CONTRIBUTING RE.ENGINEER

Kerry Mathews


CHALLENGE

During a maintenance call out on a steam drum, a set of three level transmitters were deviating with one deviating over 3 inh2o (shown in the picture below). Has the calibrated span widened 3 in or is the measurement off 3 in?


SOLUTION

This was the ultimate process of troubleshooting the transmitter; as you can see, this is a manifold setup with tubing at the transmitter and also tubing at the high and low side of the steam drum. Initially, I block and bled the transmitter at the manifold and this caused the measurement to go to zero (in this case full scale) because the URV val