It does this by turning on and off a water pump depending on the status of the sensors.
Water level control circuit using relays.
They provide a low voltage signal typically 5vdc pulsed to prevent electroplating issues to a probe or probes and a common connection on the tank.
Joydeep kumar chakraborty.
The shorter steel rod is the water high sensor whereas the longer is the water low sensor.
Anyway the given concept includes automatic water level control and high low voltage cut off.
How the operation of relay based on off control system is.
Water level controller circuit.
Water reservoir automatic level control simple circuitry 12v supply.
This is a circuit for water level controller is based on transistors and relays.
Please find the attached circuit for a very simple and cheap water level controller.
My question was in case a level switch got a problem i could change the control building the circuit of your design.
The scr in my case is not needed so i can use n1 gate to turn on an extra led placed at the correct place for a more accurate water level indicator and include a buzzer for audio warning when water.
The circuit automatically switches on the pump when water is low in the tank and switches the pump off when water reaches a predetermined mark.
This simple water level controller circuit is useful to control the water level in a tank.
With your new circuit i can clearly see where to incorporate the two transistors to control the relay for switching power to pump and heater.
With a nc normally closed or a no normally open contacts of the relay rl we can handle any type of starter.
This is the circuit to determine the level of water in the process tank using relay based on off control.
This design is only a basic portion of my own marketed product having unsafe voltage cutoff dry run cut off and led alarm indications and overall protection.
Liquid level control relays detect control levels of conductive liquids such as fresh water seawater sewage coffee see table below for other liquids.