Determine the pressure at each port of the DP transmitter during an instrument technician’s step-by-step valve isolation procedure.
Assume the process fluid sensed by the transmitter is a gas and not a liquid.
Based on the process pressures shown, identify the direction of process gas through this heat exchanger.
Also, identify what the technician needs to tell the process operator(s) prior to isolating the transmitter from this process.
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