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12v/24v universal 2 function car truck fuel level gauge meter
12v/24v universal 2 function car truck fuel level gauge meter
Bi-Metal Disc Fuel Gauge
1- stabilized power supply
2- heating coil
3-a pair of gold metal sheet
4-pointer
5-variable resistor
6-Slide
7-Float
The sensor of the bimetallic fuel gauge is the same as that of the electromagnetic type, and the bimetallic sheet is used for the indicator.
The picture shows a bimetallic fuel gauge with a regulator. It can be changed by changing the fuel level.
The size of the variable resistance value, thereby changing the heating coil current in series with it, makes the bimetal,the deformation pushes the pointer to indicate the corresponding fuel level.
Since the current flowing through the heating coil 2 is not only related to the variable resistance value, but also related to the supply voltage related. The power supply of the car is the battery and the generator in parallel, and the potential difference between the two is generally 2V left and right, the terminal voltage of the sun generator, although adjusted by the regulator, is affected by the load current,Also, larger. Therefore, the change of the power supply voltage will inevitably affect the measurement accuracy of the bimetal instrument. Therefore, if a bimetallic sheet is used as an indicator, a voltage stabilizer should be installed. When the supply voltage increases the stable the current of the heating coil in the voltage transformer increases, the temperature of the bimetal increases, and the contact pressure between the contacts increases, decreases, the closing time is shortened, and the opening time is increased, so that the current in the heating coil decreases.
The terminal white pressure drops. When the white source voltage drops, the white current of the heating coil in the voltage stabilizer decreases, and the double the temperature of the sheet metal decreases, the contact closing time increases, the opening time decreases, and the average white as the current increases, the terminal voltage increases. In this way, the indicating instrument is always in a relatively stable power . Depressing work reduces the influence of the power supply voltage on the meter.
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