Water Sensor


 Water in Fuel Sensor or WiF sensor indicates the presence of water in the fuel. It is installed in the fuel filter and when the water level in the water separator reaches the warning level, the Wif sends an electrical signal to the ECU or to dashboard (lamp). The WiF is used especially in the Common Rail engines to avoid the Fuel injector damage.The WiF sensor uses the difference of electric conductivity through water and diesel fuel by 2 electrodes.

First generation WiF sensors use a potting resin to isolate the electronic circuit, while the latest generation of Wif sensors (the WS3 sensor in Surface-mount technology) are made totally without leakage using an innovative co-moulding process.

The latest generation of WiF sensors have a high resistance to vibrations and to thermal excursion cycles.

The main automotive WiF designer and producer is SMP Poland.
A level sensing device is designed to measure the level of flow substances including liquids, slurries and granular materials. Ther are also continuous level sensors; however, these sensing modules can only detect the level of flow of a substance with a specific range.

A water sensor is a device used in the detection of the water level for various applications. Water sensors are of several types that include ultrasonic sensors, pressure transducers, bubblers, and float sensors.

Working Method

Ultrasonic sensors operate by transmitting sound waves that reflect from the liquid surface and are obtained by the sensor. The sensor measures the time interval between the transmitted and received signals, which is then converted into distance measurement with the help of electronic circuits within the sensor thereby measuring the level of the liquid.

Float sensors work based on the change in resistance of a potentiometer within the sensor by the turning of a pulley or a spring-loaded shaft.

Bubbler sensors, on the other hand, measure water level by detecting the pressure of air-filled tubes with an open, submerged bottom end. The static pressure at the end of the tubes is more when the water level is high, and therefore more air pressure is required to fill the tube.


Water sensors find applications in nuclear power plants, automobiles for measuring the amount of gasoline left in the fuel tank, engine oil, cooling water, and brake/power steering fluid.
Industrial applications of water level sensors include water level sensing in transport and storage tanks and water treatment tanks. Wess Global Inc. manufacture different types of level instruments for their use in municipal areas and also in the food and beverage industry.


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