Water Pump Relay Controller Circuit Schematic

Water reservoir automated stage keep watch over, Simple circuitry - 12V supply

By manner of a Relay, employed to power a water pump, this circuit gives automated degree keep a watch on of a water reservoir or well. The shorter metal rod is the "water high" sensor, whereas the longer is the "water low" sensor. When the water degree is beneath each sensors, IC1C output (pin #10) is low; if the water grow to bes in touch with the longer sensor the output is still low until the shorter sensor is reached. At this point IC1C output goes excessive, Q1 habitss, the Relay is energized and the pump starts running.

Now, the water stage commences to lower and the shorter sensor will be not in touch with the water, but IC1C output will most definitely be cling high through the signal return to pin #5 of IC1B, so the pump will continue its operation. But when the water stage falls beneath the longer sensor, IC1C output goes low and the pump will cease. SW1 is not obligatory and used to be delivered to offer reverse operation. Switching SW1 to be ready to join R3 to pin #11 of IC1D, the pump will operate when the reservoir is kind of empty and will stop when the reservoir is full. In this case, the pump will likely be used to fill the reservoir and to not empty it as within the default running mode.

Circuit diagram:

 Water Pump Relay Control Circuit Diagram

Parts:
R1 = 15K - 1/4W Resistors
R2 = 15K - 1/4W Resistors
R3 = 10K - 1/4W Resistor
R4 = 1K - 1/4W Resistor
D1 = LED - any kind and colour
D2 = 1N4148 - 75V 150mA Diode
Q1 = BC337 - 45V 800mA NPN Transistor
IC1 = 4001 Quad 2 Input NOR Gate CMos IC
SW = SPDT Toggle or Slide Switch (Optional)
RL1 = Relay with SPDT 2A @ 230V change
Coil Voltage 12V - Coil resistance 200-300 Ohm
Two steel rods of acceptable length

Notes:

• The two metal rods should be supported by a small insulated (wooden or plastic) board.
• The circuit can be used also with non-metal tanks, provided a 3rd metal rod having about the identical height of the tank will doubtless be introduced and linked to the circuits poor floor.
  

 

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