English 
fuel level and temperature gauge for sale
Function: indicates the stock of fuel in the fuel tank.
Structure: it is composed of sensor (float) and indicator. The sensor is composed of variable resistance and float. When the float floats in the fuel, it can directly feel the change of fuel quantity. With the change of oil quantity, the position of the float in the oil tank changes, which changes the resistance value of the variable resistance and realizes the conversion of non electric quantity into electrical signal. There are two coils with different turns, one is connected in series with the sensor (less turns), the other is connected in parallel with the variable resistor, and there is a pointer between the two coils. When the value of the variable resistance changes, the current through the two coils changes, so as to change the count of the pointer. Working condition: when the fuel level is low, the resistance of the variable resistance decreases, and the current flowing through the series coil is large, while the current of the parallel coil is small, so the pointer points to a small value. When the fuel level is high, the resistance of the variable resistance increases, the current flowing through the parallel coil increases, and the number of turns is large, so the suction pointer points to the full position.
Generally, there is only one of the two on the instrument of a car. The engine temperature is first transmitted to the oil and then to the coolant, so these two indicators mean the same thing.Working condition: when the circuit is connected and the water temperature is not high, the bimetallic mainly depends on the heating coil to produce deformation, so the bimetallic needs to be heated for a long time to separate the contacts. After the contact is opened, due to the low surrounding temperature and fast heat dissipation, the bimetallic cools rapidly and closes the contact. Therefore, when the water temperature is low, the contact works in the state of long closing time and short opening time, which increases the average value of the current flowing through the heating coil of the water temperature gauge, and the bimetallic is deformed greatly, which drives the pointer to deflect to the right to indicate the low water temperature. When the water temperature is high, the temperature around the bimetallic is high, the closing time of the contact is short and the opening time is long, and the average value of the current flowing through the heating coil of the water temperature gauge is small. The normal working water temperature should be between 75-95 ℃.Nanjing Hemu's fuel level and temperature gauge for sale all the time.
Get a Quote / Info