Water level indicator in the car radiator. Free Technical Library article

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Car radiator water level indicator

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Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices

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The car radiator must contain enough water. If the driver does not notice a significant decrease in water in the radiator in a timely manner, the engine will overheat.

The device for monitoring the water level in the radiator (see diagram) has the advantage over similar devices that when it is used, electrolysis does not occur, leading to the gradual destruction of the radiator walls. The use of silicon transistors makes the device less sensitive to significant temperature changes.

The basis of the device is a multivibrator with one stable state on transistors T2 and T3. Its load is signal lamp L7. Transistor T4 contributes to a clearer fixation of the operating state (open - closed) of transistor T2.

When the probe in the radiator is immersed in water, a bias voltage is applied to the base of the transistor T1 and it is open. In this case, the base and emitter of the transistor T2 have the same potential and this transistor will be closed. As a result, the multivibrator does not work, and the signal lamp L1 is de-energized. Diode D1 protects the base of transistor T2 from overvoltages.

When the water level in the radiator drops, the dipstick is in the air. As a result, the transistor T1 closes, and T2 opens. Now the multivibrator will operate at a frequency determined by the time constant of the R4 C1 chain (about 2 Hz). Signal lamp L1 will flash at the same frequency, attracting the attention of the driver.

Capacitor C1 must be made of paper, since during operation the polarity of the charge on it reverses. The probe is made of stainless steel, and the probe plug is made of plastic with a high melting point. For these purposes, you can use nylon, fluoroplastic or lavsan.

Only silicon transistors and diodes should be used in the device. For example, transistors T1, T2 can be taken as MP116, T3 - KT602 and T4 - KT315 with any letter index. Diode type D103 or D106 with any letter index.

Publication: cxem.net

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