Electrician Red Seal · Question
An electrician is tasked with re-calibrating a pressure transducer in a clean room environment. The transducer has a range of 0 to 100 psi and outputs a 4-20 mA signal. After simulating 50 psi at the transducer, the control room HMI shows a value of 40 psi. What adjustment is required?
If the transducer reads 50 psi but the HMI shows 40 psi, there is a discrepancy in the scaling (gain) of the signal, assuming the 4 mA (0 psi) point is correct.
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Question: An electrician is tasked with re-calibrating a pressure transducer in a clean room environment. The transducer has a range of 0 to 100 psi and outputs a 4-20 mA signal. After simulating 50 psi at the transducer, the control room HMI shows a value of 40 psi. What adjustment is required?
Answer options: ✅ Adjust the span (gain) of the transducer output.
- Adjust the zero (offset) of the transducer output.
- Recalibrate the HMI scaling only.
- Increase the excitation voltage to the transducer.
Correct answer: Adjust the span (gain) of the transducer output.
Explanation: If the transducer reads 50 psi but the HMI shows 40 psi, there is a discrepancy in the scaling (gain) of the signal, assuming the 4 mA (0 psi) point is correct. Adjusting the span of the transducer or the scaling in the HMI/PLC would be necessary to correct this difference. Adjusting the zero would be for an offset error, not a proportional one.
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