A practical example of single-loop process control

Here, we will use a temperature sensor, a temperature controller, and a contactor (actuator) to keep the temperature of a heater at the desired level (or setpoint).

Materials/devices

The required materials include the following:

• A thermocouple temperature sensor (Type K)
• A temperature controller (JTC903)
• A contactor
• A heating element

Wiring

Make the connection as shown in the following diagram (Figure 12.17):

Figure 12.17 – Pictorial diagram of a temperature control system (Credit: Showlight Technologies Ltd.: www.showlight.com.ng)

Operation:

1. Set the dial on the front of the temperature controller to the setpoint of your choice, that is, the temperature you want to maintain – for example, 100 degrees Celsius.
2. Supply power to the circuit by switching on the breaker.
3. When the temperature of the heater is below the setpoint, the common terminal...