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A PID temperature controller is only one element of a temperature control system. For accurate control, all of the elements need to correctly execute their part. First to ensure reliable temperature control, the temperature controller will need to know the actual temperature. So the sensor type will need to be known which can be a thermocouple which is common in most higher temperature applications, but can also be PT100 or RTD or maybe even 4-20mA or 0-10V signal generated from a temperature transmitter or converter, either way this is known as the Input. The type of heat source the temperature controller will control also needs to be taken into consideration, will it be a heater that can be switched on and off, and if so, how many amps will the heater use. If it is over 2A heater we may need to use a SSR or electro mechanical contactor. Otherwise the heat may be supplied via a proportional control valve as is common in steam systems. The heat source and control switching requirements determines the output type required by the temperature controller, various options are Relay output , solid state relay drive (SSR) output, 4-20mA and 0-10V. The precision of the temperature control required will determine the control type, with the on/off and PID temperature controller being the most prevalent. The ATR243-20 PID temperature controller covers any of the above possibilities including configuration for any common thermocouple, including thermocouple types R,S,T,K,J,N. Some applications require single loop temperature controllers as there is only 1 zone in the process, however other applications where there are several zones such as continuous brick kilns require multiple loop PID temperature controllers or a number of single loop PID temperature controllers that can share setpoint entry from a single temperature controller in the system. The ATR401-22ABC-T PID temperature controller has remote setpoint entry and can be used for multiple zone applications and also accepts multiple thermocouple inputs. Most of the above applications use what is referred to as front of panel or panel mount temperature controllers. These controllers provide a clear display on the front of the controller. The machine operator can use this display to entered the desired temperature into the controller and make subsequent system changes. With advancements in technology back of panel of DIN rail mount controllers are becoming more popular used in conjunction with a touchscreen colour machine interfaces. The DRR245 PID temperature controller and wide range of Pixsys PLC products offer attractive solutions to this approach. About The Author : The Author is an expert information on the innovative range of DIN Rail Controller, thermocouple and Signal Isolatorrelated products.
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