Electrician Red Seal · Question
A process involves mixing chemicals, and a sensor outputs an analog signal between 4 mA and 20 mA, proportional to the chemical concentration (0-100%). The PLC analog input module expects a 0 V to 10 V signal. Which of the following would be the most suitable interface component to correctly process this sensor signal for the PLC?
A current-to-voltage (I/V) signal conditioner is specifically designed to convert a 4-20 mA current loop signal into a proportional voltage signal, such as 0-10
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Question: A process involves mixing chemicals, and a sensor outputs an analog signal between 4 mA and 20 mA, proportional to the chemical concentration (0-100%). The PLC analog input module expects a 0 V to 10 V signal. Which of the following would be the most suitable interface component to correctly process this sensor signal for the PLC?
Answer options:
- A simple voltage divider circuit. ✅ A current-to-voltage signal conditioner.
- A digital-to-analog converter (DAC).
- A programmable logic controller (PLC) direct connection without modification.
Correct answer: A current-to-voltage signal conditioner.
Explanation: A current-to-voltage (I/V) signal conditioner is specifically designed to convert a 4-20 mA current loop signal into a proportional voltage signal, such as 0-10 V. This allows the PLC's analog input module to correctly interpret the sensor's output. A voltage divider is unsuitable for current signals, a DAC converts digital to analog, and direct connection would be incompatible with different signal types.
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