Introduction to PID & Temperature Controller
OMEGA Engineering Singapore
A temperature controller is an instrument, which is used to control the temperature of a process. A temperature controller is part of a system, which is connected to two components: an input, such as a temperature sensor (thermocouple or RTD) and an output, such as a control element (heater or fan). The temperature controller receives an input signal from the temperature sensor and based on the signal received, it will send an output signal to the control element.
In order to control the process temperature accurately without operator intervention, the temperature controller comparers the actual temperature, which it receives from the temperature sensor to the desired control temperature or setpoint of the process. The temperature controller will then send an output to the control element to either increase or decrease the temperature to meet the setpoint of the process.
There are three types of controllers: On-Off, Proportional and Proportional Integral Derivative (PID Controller) and depending upon the system to be controlled, the operator is able to use one type or another to control the process and these three different types are described below.
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