Which device controls coil outlet temperature?

• A. Temperature Transmitter
• B. Pressure Gauge
• C. Flow Meter
• D. Ignition Switch

Answer: (A)

In a temperature-control loop, accurate feedback is essential for keeping the coil outlet at the desired temperature. The temperature transmitter serves as the sensor-and-signal element that measures the outlet temperature (via a thermocouple or RTD) and converts that measurement into a standardized electrical signal that the control system can read. This signal is fed to the controller, which then adjusts the heat input or flow to bring the outlet temperature to the setpoint. The other devices have different roles: a pressure gauge monitors pressure, a flow meter monitors flow rate, and an ignition switch starts or stops the burner. None of them provide the temperature feedback needed to regulate the coil outlet temperature.