PID Controllers-Single and Two Loops (Microcontroller Based)

PID Controllers-Single and Two Loops (Microcontroller Based)

PID-967

PID-480

PID-485

PID-912

PID-913

PID-903

PID-966

Product Specification :
Model wise descriptions :

Description :

Libratherm offers Four new models of PID controllers ,Model PID-723,PID-966,PID-948 and PID-489. These are designed and developed using the latest microcontroller chip and programmed with the time tested and field proven PID algorithm. PID controllers are mainly used for the precise process control. Unlike On/Off type of oscillatory control, PID control action gives smooth and steady state control. These model offers, all the useful features which are required to control the complex system.

These models accept factory set single or dual fixed input or the user selectable universal input. The control action is user selectable as PID or On/Off for both direct and reverse or Heat and Cool action . Control outputs are given in the form of optically isolated DC pulse to drive external SSR, Triac or AC SSR to operate AC operated load, electro mechanical relay and/or linear analog output. The analog output levels can also be configured for (0-20)mA or (4-20)mA or (0-5) / (0-10) volt using the front panel key board,

In brief, PID-723, PID-948 and PID-489 provides 4 switching outputs and 2 analog outputs whereas PID-966 provides 6 switching and two analog outputs. Both Auto and manual tuning of PID values makes the controller versatile and user friendly. The model PID-723,PID-948 and PID-489 being small in size, can easily be accommodated in small size equipments. One Ramp/Soak function allows user to gradually increase the set value and hold the process value for desired soak time.

These models are only designed to accept two independent input sensor, which avoids the need for two controllers, where the space and cost is the constraint. This feature is useful for system where two sensors are used for controlling two independent loads, as in case of strip / blister packaging machines where two heaters are to be controlled and each heater has individual sensor

Libratherm also offers customized algorithm for special purpose applications, where user or OEM wants to have control and logic action to suit their application.

PID Controller with Universal / Fixed Input and Selectable Outputs:

Such controllers are used for single input with onsite facility to select the desired input type, but output can be selected as desired.

PID Controller with Two Inputs And Two Outputs

Such controllers are mainly used for single system having two same type of sensors and two independent control outputs. Or to use One input as indication only and other input for controlling.

Features :

• Microcontroller based design.
• Single loop PID function.
• One Ramp/Soak feature (user programmable).
• Available Control - Two logic (DC pulse) and Two analog (12 bit resolution).
• Auto/Manual tuning of PID parameters.
• Field proven Algorithm tested successfully for various process control applications.
• Auto/Manual bump less transfer.
• Two programmable alarms and / or event relay outputs.

Application :
• Furnace / Oven Temperature control
• Pressure control
• Constant Temperature Bath
• Cold storage and Chilling plants
• Laboratory equipment.
• Plastic Injection, Extruder machines
• Material Testing equipments
• Auto Clave, BOD incubator

Technical specifications :

The following specifications will suit almost all PID control applications – however, for special PID algorithm for controlling modulating motorized valve refer to the model PID-966-M.