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Automotive Sensors by John Turner

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CHAPTER 10

LIQUID LEVEL SENSORS

Yingjie Lin

Francisco J. Sanchez

1. INTRODUCTION

Liquid level sensors are widely used on road vehicles to monitor the amount of fluid contained within a reservoir. There are many applications, including fuel, lubricant, hydraulic system, coolant, and electrolyte level monitoring. New applications are also emerging. Revised emissions regulations for diesel engines are making it likely that there will be a need to measure the amount of urea carried on board a vehicle to ensure that the selective catalytic reduction (SCR) systems now being introduced function correctly.

There are many technologies that can be applied to fluid level sensing, each of which has advantages and disadvantages. As for any transducer, fluid ...

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