How to Choose Temperature Controller

May 21 , 2021

Temperature Controller kinds and how to choose?

There are three basic types of temperature controllers: switch temperature controllers, proportional controllers, and PID controllers. Depending on the system to be controlled, the operator will be able to use one type or other type of controller to control the process.

Switch temperature controller

The switch controller is the simplest kind of temperature control equipment. The output of this device has only two states of "on" and "off", without any intermediate states. Only when the temperature exceeds the set value, the switch controller will switch the output. For heating control, the output is "on" when the temperature is lower than the set value, and the output is "off" when the temperature is higher than the set value.

A special type of switch control used for alarms is the limit controller. This controller uses a latching relay that must be reset manually, and is used to end a process after reaching a certain temperature.

Proportional controller

Proportional control is dedicated to eliminate loops associated with switch control. The proportional controller can reduce the average power supply to the heater when the temperature is close to the set value. This can slow down the heating of the heater so that the temperature does not exceed the set value, but will approach the set value and maintain a stable temperature. This proportional control operation can be achieved by turning the output on and off in a short time interval. This "time proportional control" controls the temperature by changing the ratio of the "open" time to the "close" time. To

One of the major advantages of proportional control is that it is easy to operate. It may require small adjustments by the operator (manual reset) to set the setpoint temperature at initial startup, or to make adjustments when process conditions change significantly.


PID controller

Three kinds of controllers (PID controller) can provide integral and differential control for the proportional controller. The controller combines proportional control with the other two adjustments to help the equipment automatically compensate for changes in the system. These adjustments (integral and differential) are expressed in time-based units; they can also be expressed by their reciprocal (RESET and RATE, respectively).

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