Water Level Probe Circuit

Whenever tank gets filled we get alerts on particular levels.

Water level probe circuit. The ground probe shown in the figure remains in the water but it can also be mounted at the same level as the sense probe the function of the water sensor circuit is to determine if both probes are in the water. The ends of probes of the water tank level indicator are connected to corresponding points in the circuit as shown in circuit diagram. So this setup will last really long. From this moment the water level to b before reaching the pump and filling the engine work.

The more copper probes are in the water the lower the resistance of the ladder network is. Insulated aluminium wires can be used as the probes. This in turn makes the transistors conduct to glow led and indicate the level of water. If you fill the water tank filling process gerşekleşmess ie the water level when the engine first tries to probe b in 1 minute ulaşmass water refilling engine automatically stops and the error led will start flashing.

The 5 v power supply can be a lab power supply a wall wart or three 1 5 v batteries in series the circuit will work fine using 4 5 v. The principle of operation of the water level sensor is based on the conductive properties of the water. Corrosion in water level sensor probes take place due to dc supply which is normally used for triggering the probes through water. Here we have created 4 levels low medium high and full we can create alarms for more levels.

The level sensing part of the circuit is built around transistors q1 q2 and q3. Water level controller circuit diagram probe arrangement diagram the probes can be arranged as shown in the diagram above. The probes can be binded on a plastic rod and should be erected vertically inside the tank. The higher the salinity the higher the conductivity equivalent to lower resistance.

This simple transistor based water level indicator circuit is very useful to indicate the water levels in a tank. When water level is below the quarter level probes a b and c are open and the transistor q1 q2 and q3 remains off. With this set up. A number of level sensors which work with metal terminals use dc power that eventually corrode as a result of the effects of electrolysis triggered by the water and dc current between the sensing leads.

The other probe in underground tank which is slightly above the dry run level is marked s. Since dc is used in the level sensing section electrolysis will occur in the probes. This lower resistance value results in a higher input voltage to the 12 bit adc at the gpio pin of the esp32. Insulated aluminum wires with end insulation removed will do for the probe.

Arrange the probes in order on a pvc pipe according to the depth and immerse it in the tank. Here we learn how to create an anti corrosive probe circuit for water level sensors which will ensure that the water has minimum impact on the probes and does not cause corrosion in the long run. We have added 3 leds to indicate initial three levels a b c and one buzzer to indicate full level d. This is aggravated by the process of minor electrolysis across the probe terminals which in the long term usage results in formation of layers of chemicals an minerals gradually inhibiting efficient working of the probes and affecting the water sensing ability of the circuit.

When tanks gets filled completely we get beep sound from buzzer. The average conductivity value of the tap water supplied in my area is approx 35 ms m. The length of the probes wires and the supporting plastic rod must be chosen according to the depth of the tank. In this water level controller circuit the common probes connecting the underground tank and the overhead tank to 9v supply are marked c.