For a pneumatic transmission system for...

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Question 1 of 205eccefa5bacbc34ba4d48768

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?

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🔍 Key Concepts

• 3–15 psig instrument air range and what physical range (0–1000 psig) it represents • How to use a linear relationship between signal pressure and indicated pressure • Difference between signal range (span) and zero offset

💭 Think About

• What pressure on the process scale (0–1000 psig) should correspond to 3 psig and to 15 psig in the signal? • How far is 9 psig between 3 and 15 psig, as a fraction of the total 3–15 psig span? • Once you know that fraction, how do you apply it to the 0–1000 psig indicator scale to find the corresponding indicated pressure?

✅ Before You Answer

• Be sure you subtract the lower range value (3 psig) before finding the fraction of span • Confirm that 3 psig corresponds to 0 psig on the 0–1000 psig scale and 15 psig to 1000 psig • After calculating the process pressure, check if it matches one of the listed choices without rounding errors

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