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On/Off Temperature Controllers Comparison Table

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on-off controllers are the simplest form of temperature control devices. Our on/off devices is either on or off, with no middle state. On-off controllers 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 near the setpoint. “hysteresis,” value is added to the controller operations to prevent any damage to contactors and valves in cases where this cycling occurs rapidly. Our on/off controllers may use in many applications where absolute control is not necessary. However in more accurate and sensitive applications our pid controllers should be selected.


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