S.A Electronic Private Limited

• HEAT TREATMENT FURNACES

• 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 SET POINT. FOR HEATING CONTROL, THE OUTPUT IS ON WHEN THE TEMPERATURE IS BELOW THE SET POINT, AND OFF ABOVE SET POINT. SINCE THE TEMPERATURE CROSSES THE SET POINT TO CHANGE THE OUTPUT STAGE, THE PROCESS TEMPERATURE WILL BE CYCLING CONTINUALLY, GOING FROM BELOW SET POINT TO ABOVE, AND BACK BELOW. IN CASES WHERE THIS CYCLING OCCURS RAPIDLY, AND TO PREVENT CONTACTORS AND VALVES FROM GETTING DAMAGED, AN ON-OFF DIFFERENTIAL, OR “HYSTERESIS,” IS ADDED TO THE CONTROLLER OPERATIONS. ON-OFF HYSTERESIS PREVENTS THE OUTPUT FROM “CHATTERING” OR MAKING FAST, CONTINUAL SWITCHES IF THE CYCLING ABOVE AND BELOW THE SET POINT OCCURS VERY RAPIDLY.

Different models of digital process / temperature controllers and indicators. I’ll organize and clarify the descriptions so they are cleaner and easier to understand.

• PID – Proportional, Integral, Derivative control method.

• Auto-Tune – Controller automatically calculates PID parameters.

• PV (Process Value) – Actual measured value (temperature, pressure, etc.).

• SP (Setpoint) – Desired target value.

• Dual Channel – Can display/control two sensors/process values.

• Explosion-proof (XP) – Designed for hazardous industrial environments.

• Relay Output – Used to control external devices like heaters, motors, or valves.

✅ These devices are typically used in industrial automation, temperature control systems, furnaces, boilers, chemical processes, and manufacturing lines.

If you want, I can also help you:

• Group these models by function (controller vs indicator)

• Create a professional product comparison table

• Explain the difference between PID, ON/OFF, and Proportional controllers.

• Measures pressure in units like bar, PSI, kPa
• Displays readings on an LCD/LED screen
• Provides high accuracy compared to analog gauges
• Often includes features like min/max recording, alarms, and data logging

• Industrial systems (hydraulics, compressors)
• HVAC systems
• Oil & gas pipelines
• Water treatment plants
• Calibration and testing labs