How many pins connect the sensor assembly to the transmitter assembly?

• A. 2 pins
• B. 4 pins
• C. 3 pins
• D. 5 pins

Answer: (C)

The connection between the sensor and the transmitter uses three pins because you need a power supply for the sensor, a common return path, and a dedicated signal line to carry the measurement to the transmitter. One pin provides the supply, one is ground, and the third carries the sensor’s output signal so the transmitter can accurately process and transmit the reading. A two-pin setup wouldn’t give a separate reference for the signal and would struggle to power the sensor reliably, while four or five pins would indicate extra features (like shielding, multiple outputs, or additional sensors) not required for the basic sensor-to-transmitter link.