What is an automotive expansion tank sensor
Automobile expansion tank sensor is a kind of equipment used to monitor the change of liquid level in the expansion tank. It is usually installed in the cooling system of the automobile. Its main function is to ensure the stable operation of the cooling system and prevent the automobile from overheating.
Definition and function
Automotive expansion tank sensors, also known as expansion tank level sensors, are specifically designed to monitor changes in the level of the cooling system tank. It senses the change of water level, converts the information into electrical signals, and transmits them to the instrument panel, helping the driver grasp the working status of the cooling system in real time . When the liquid level is below the preset safety threshold, the sensor will trigger an alarm signal to remind the driver to take timely measures .
Structure and working principle
The sensor of expansion tank usually adopts float reed switch type magnetic sensor, the core components of which include float, reed tube and wire. The float floats up and down with the liquid level, driving the internal permanent magnet to move, changing the magnetic field distribution around the reed tube, thus changing the circuit state. When the liquid level is lower than the safety threshold, the circuit closes and triggers the alarm signal .
Maintenance and troubleshooting
In order to ensure the continuous and stable operation of the expansion tank sensor, regular maintenance and maintenance are required. Specific measures include:
Clean sensor electrodes to prevent contamination and corrosion.
Check the sensor circuit : ensure that the connection is normal and trouble-free.
Replace the sensor : replace the sensor according to the use condition to avoid the fault caused by aging or damage .
When a sensor fails, common maintenance methods include:
Clean or replace sensor electrodes : prevent contamination and corrosion.
Repair circuit faults : repair short circuit or open circuit problems.
Replace the internal components : such as capacitors, etc., to ensure that the sensor works properly .
The main function of the automobile expansion tank sensor is to monitor the liquid level change in the expansion tank, and pass the liquid level information to the instrument panel through electrical signals, and help the driver grasp the working status of the cooling system in real time . When the liquid level is below or above the preset safety threshold, the sensor will trigger an alarm signal to remind the driver to take timely measures to avoid engine overheating or coolant leakage .
Working principle
The liquid level sensor of the expansion tank realizes its function by physical sensing and electrical signal conversion. The common sensor type is float-reed switch magnetic sensor, which adopts reed tube switch structure. When the liquid level in the expansion tank changes, the float floats up and down with the liquid level, driving the internal permanent magnet to move, changing the magnetic field distribution around the reed tube, thereby changing the state of the circuit. When the liquid level is below the preset safety threshold, the circuit closes and triggers the alarm signal .
Structural characteristics
The sensor is compact in structure and compact in design, mainly including float, reed tube, wire and fixed device. As an induction element, the float must have good buoyancy and corrosion resistance; As the core switch element, reed tube needs to have high sealing and stability; The wire is responsible for transmitting the detected signal to the instrument panel or control unit for remote monitoring and alarm .
Maintenance and troubleshooting
In order to ensure the continuous and stable operation of the sensor, regular maintenance and maintenance are required. Specific methods include: regular cleaning of sensor electrodes to prevent contamination and corrosion; Check the sensor circuit to ensure that the connection is normal and trouble-free; Timely replacement of the sensor or its internal components to avoid failure due to aging or damage .
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