Introduction to Temperature Controllers with PID Controllers
As the name implies, a temperature controller – often called a PID controller is an instrument used to control temperature. The temperature controller takes an input from a temperature sensor and has an output that is connected to a control element such as a heater or fan.
To accurately control process temperature without extensive operator involvement, a temperature control system relies upon a controller, which accepts a temperature sensor such as a thermocouple or RTD as input. It compares the actual temperature to the desired control temperature, or setpoint, and provides an output to a control element.
How does our controllers work being the top distributor for Shimaden Controller in South East Asia we offer functions like On/Off Control and etc.
An on-off controller is the simplest form of temperature control device. The output from the device is either on or off, with no middle state. An on-off controller will switch the output only when the temperature crosses the setpoint. For heating control, the output is on when the temperature is below the setpoint, and off above setpoint. Since the temperature crosses the setpoint to change the output state, the process temperature will be cycling continually, going from below setpoint to above, and back below. In cases where this cycling occurs rapidly, and to prevent damage to contactors and valves, an on-off differential, or “hysteresis,” is added to the controller operations. This differential requires that the temperature exceed setpoint by a certain amount before the output will turn off or on again. On-off differential prevents the output from “chattering” or making fast, continual switches if the cycling above and below the setpoint occurs very rapidly. On-off control is usually used where a precise control is not necessary, in systems which cannot handle having the energy turned on and off frequently, where the mass of the system is so great that temperatures change extremely slowly, or for a temperature alarm. One special type of on-off control used for alarm is a limit controller. This controller uses a latching relay, which must be manually reset, and is used to shut down a process when a certain temperature is reached.
Choice selection provided by dpstar is very easy and simple.There are several consideration when selecting a temperature controller such as :
1- Type of input sensor (thermocouple, RTD) and temperature range
2- Type of output required (electromechanical relay, SSR, analog output)
3- Control algorithm needed (on/off, proportional, PID)
4- Number and type of outputs (heat, cool, alarm, limit)
We are the best supplier in Malaysia also we are the only Shimaden main distributor for South East Asia. The quality and certification of our product is also well known. dpstar can assist with any needs you have with our friendly staffs that are experts towards your inquiry and your problems. . For more information visit us on our website.