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17-09-2017, 10:38 PM

What kind of questions we can expect when we give seminar on water level indicator

jaseela123d · 18-09-2017, 03:29 PM

Description

This is the circuit diagram of a simple corrosion-free water level gauge for the home and industries. In fact, the level of any non-corrosive conductive liquid can be measured using this circuit. The circuit is based on 5 transistor switches. Each transistor is connected to actuate the corresponding LED, when its base is supplied with current through the water through the electrode probes.

An electrode probe is (F) with 6V AC is placed on the bottom of the tank. The following probes are placed step by step above the bo1ttom probe. When the water is rising the base of each transistor gets the electrical connection to 6V AC through the water and the corresponding probe. Which in turn causes the transistors to lead to brightness LEDs and indicate the water level. The ends of the probes are connected to the corresponding points in the circuit, as shown in the circuit diagram. Insulated aluminum wires with removed end insulation will fit the probe. Arrange the probes in order on a PVC pipe according to the depth and immerse it in the tank. The AC voltage is used to avoid electrolysis in the probes. So this setup will last a long time. I guarantee at least 2 years of maintenance free operation. That's what I got and it still leaves.

Components

• Transistors T1 - T5 BC 548 or 2N2222

• Resistors R1-R5 2.2K 1/4 W

• Resistors R6-R10 22K 1/4 W

• D1 - D5 LED (color of your choice)

Notes:

Use a transformer with 6V 500mA output for the power supply. Do not use a rectifier! we need pure AC. Use good quality insulated aluminum wire for the probes. If aluminum wires are not available try steel or dye. Copper is the worst. Test the circuit first on a breadboard and if it does not work properly, make adjustments to the resistance values. This is often necessary because the conductivity of the water changes slightly from place to place. The type number of the transistors used here are not critical and any small NPN signal transistor will do the job. Few other suitable type numbers are BC546, BC107, PN2222, BC337, BF494, ZTX300, BEL187 etc. The circuit can be enclosed in a plastic box with holes to reveal the LEDs.

Circuit Diagram of the Water Level Indicator and Sensor Arrangement.

[Image: simple-water-level-indicator.jpg]

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