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142. For a pneumatic transmission system for instrumentation purposes, if a pneumatic temperature indicator has a calibrated scale of -40 to +40°F, what would be the actual measured temperature 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?
A pneumatic indicator with a -40 to +40F range and a transmitted signal pressure of 9 psig indicates a temperature of 0F. This is because 9 psig represents the midpoint of the standard 3-15 psig signal range, which corresponds to the midpoint of the temperature range.
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