Electrician Red Seal · Question
A Red Seal Electrician is commissioning a new level control system for a water tank. The system uses a differential pressure (DP) transmitter to measure the water level, which outputs a 4-20 mA signal. The tank is 5 metres high, and the DP transmitter is mounted at the bottom. What mA signal should the electrician see when the tank is half full?
A 4-20 mA signal range represents the full measurement span. 4 mA corresponds to 0% (empty) and 20 mA corresponds to 100% (full). Therefore, half full (50%) of
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Question: A Red Seal Electrician is commissioning a new level control system for a water tank. The system uses a differential pressure (DP) transmitter to measure the water level, which outputs a 4-20 mA signal. The tank is 5 metres high, and the DP transmitter is mounted at the bottom. What mA signal should the electrician see when the tank is half full?
Answer options:
- 4 mA ✅ 12 mA
- 16 mA
- 20 mA
Correct answer: 12 mA
Explanation: A 4-20 mA signal range represents the full measurement span. 4 mA corresponds to 0% (empty) and 20 mA corresponds to 100% (full). Therefore, half full (50%) of a 16 mA span (20 mA - 4 mA) is 8 mA, which added to the 4 mA offset equals 12 mA.
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