How is coil outlet temperature controlled?

• A. By the Temperature Transmitter
• B. By the Pressure Switch
• C. By the Flow Meter
• D. By the Control Valve

Answer: (A)

In this control loop, keeping the coil outlet temperature at the desired value relies on feedback from a sensing and signaling device. The temperature transmitter measures the actual outlet temperature and converts that reading into a standard electrical signal that the control system can use. This signal tells the controller exactly how far the temperature is from the setpoint, so the controller can adjust the process to correct it. The control valve typically acts on that instruction to change flow or heat input and bring the temperature to the target. The transmitter is essential because it provides the accurate, interpretable temperature signal that makes automatic regulation possible. The other options either measure something else (pressure, flow) or are the actuator, not the source of the temperature signal used for feedback.