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- Third Assistant Engineer (Steam-Motor-Gas Turbine Plants (Unlimited)) »
- Q535 - General Subjects
592. For a pneumatic transmission system for instrumentation purposes, if a pneumatic pressure indicator has a calibrated scale of 0 to 1000 psig, what would be the actual measured pressure if the transmitted pneumatic signal pressure to the indicator is 9 psig, assuming the industry standard of 3 to 15 psig is used for instrument air?
The signal of 9 psig is midway between the 3-15 psig range, representing 50% of the span. Therefore, the indicator displays 50% of its calibrated 0-1000 psig scale, resulting in a measured pressure of 500 psig.
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