Liquid Sensing Technology

Fuel-Level Sensing and Liquid Sensing

Vehicle manufacturers are continually developing new vehicle body designs that challenge the functionality of traditional fuel tank apparatus. The current “toilet float technology” depends on a mechanical float and arm, prone to damage and inaccuracies. To provide better accuracy, Schrader’s new all-electric fuel-level sensing technology measures fuel volume by sending a radio frequency (RF) signal into the fuel tank, thus creating a more precise and accurate reading. This new technology has no moving parts to fail or cause errors.

“In modern vehicles, one of the components that has changed very little from its first design is the fuel level sensor. Even before the fuel level sensor was ‘electrified’ it was a simple mechanical float that moved a needle on a gauge, indicating the level of fuel in the tank. Schrader’s new all-electric fuel-level sensor completely changes the game,” says Carl Wacker, vice president of sales and marketing, Schrader Electronics.

Unlike fuel, other liquid applications such as water tanks, urea tanks, and wiper bottles are at risk freezing in colder climates, which would immobilize mechanical float arms and prevent accurate readings. In contrast, Schrader’s liquid sensors are not affected by frozen fluids, and so provide motorists with accurate and active fluid levels in any weather.

Flex-Fuel Sensors

Over the last few decades, flex-fuel vehicles have become increasingly popular because of their positive environmental impact and high gas mileage. Schrader’s flex-fuel sensor uses a patented technique to detect critical electrical properties in fuel, including ethanol concentrations of flex-fuel mixtures. The sensor can then accurately provide that information directly to engine control systems in real-time. Additionally, because high-ethanol fuel burns at a different temperature and rate than typical automotive gasoline, the sensor allows engine control systems to adjust dynamically as ethanol concentrations change.

Making use of the fact that the fuel in the tank acts as an electrical load to the series resonant circuit, an RF signal is radiated into the fuel tank. Our innovative directional antenna with intelligent compensation software allows the system to then give a linear output directly proportional to the fuel volume in the tank.

Features Set
  • Auto diagnosis for easy service
  • Non-fuel sensing for water, urea, and waste applications
  • Can be mounted internally or externally, enabling use with all plastic and metal tanks
Value Proposition
  • Eliminates problematic tank dead bands
  • Reverse-compatible with current float arm technology
  • Market extends from automotive to motor home
Technical Specifications
  • For more information, contact Schrader’s engineers through ”Connect with Schrader”