Radiator water level indicator. Free Technical Library article

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Radiator water level indicator

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

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Drivers do not always check the water level in the radiator. It is even more difficult to control it while the car is moving.

A simple transistorized device (Fig. 4.11) allows you to make a light signaling that warns the driver about the approach of an emergency.

The sensor F1 of the signaling device is two metal plates separated by an insulator made of non-wettable materials, such as polyethylene or fluoroplastic.

Ris.4.11

The device is triggered when the water level changes, when it is below the position of the sensor F1. In this case, the base current of the transistor VT1 decreases, and due to the current through R2, the transistor VT2 opens - the HL1 LED lights up.

The following details are used in the circuit: resistors of type C2-23, capacitor C1 of type K73-9 for 250 V, LED HL1 is suitable for any type, in a plastic case. Transistors VT1 and VT2 may have the last letters D, F, K, L in the designation.

To protect the circuit from ripple and interference in the vehicle's on-board network during engine operation, a diode and inductor T1 are used. The inductor is made on a ring core of size K10x6x3 from ferrite grade 2000NM1 (4000NM1). The windings contain 30...40 turns of PELSHO-0,12 wire. When connecting it, it is necessary to observe the phase polarity indicated in the diagram. In this case, T1 will not be magnetized.

The device remains operational when the supply voltage changes from 5 to 16 V and does not need to be adjusted.

This scheme can be used in a variety of cases where it is required to control the water level.

Publication: cxem.net

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