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Identify High and Low Ports on Pneumatic DP Transmitter

Identify the “high” and “low” ports on this pneumatic differential pressure transmitter, and explain your reasoning:

Pneumatic DP Transmitter

High and Low Ports on Pneumatic DP Transmitter

Also, explain how this transmitter will respond to an increasing pressure at each of its two ports, including the operation of the bellows feedback mechanism.

Answer:

Port “A” is the “high” pressure port on this transmitter, and port “B” is the “low” pressure port.

Remember: an increasing pressure applied to the “high” port causes an increasing signal out of the transmitter.

Conversely, an increasing pressure applied to the “low” port causes a decreasing signal out of the transmitter.

Note: These are very old models and obsolete now.

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Identify High and Low Ports on Pneumatic DP Transmitter

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