Digital display controller for solenoid valve
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Can interlock be achieved using the alarm output of the digital display? The solenoid valve A should be activated at 25 degrees, and it should be deactivated when the temperature reaches 35 degrees; since the temperature remains within the range of 25 to 35 degrees most of the time, the valve is essentially in the open state. Is it possible to use only one of the alarm outputs from the digital display to achieve this through an alarm hysteresis mechanism?
Sure. The temperature lag is relatively large, so the control range and the selection of instruments need to be taken into consideration. According to the control requirements, the alarm (control) point can be set at 30 degrees, so that the solenoid valve switches essentially between 28 and 32 degrees. If the process requirements are stringent in terms of safety, its control method needs to be considered.
The hysteresis is uncertain; it is best to use two alarm points for controlling high and low temperatures.
Use the high/low readings of the digital meter for connection; if the switch signal is insufficient, add an intermediate relay
Then what’s the use of leaving other channels? Are there two input sources?