Reed sensors used in Fuel cap position sensing
A dashboard or an instrument panel located in front of the automobile driver and displays instrumentation and controls for the vehicle’s operation. This is Driver information. Automobiles these days provide a wide range of information ranging from door and window position, wind screen viper fluid level, whether a tail lamp has failed, the positions of the engine hood and trunk and also whether the fuel cap has been closed fully. Reed sensors are the only devices that are hermetically sealed and completely safe to use even inside fuel tanks and they are molded, which means they can withstand higher shock and vibration limits, as well. Reed Sensors also have the added advantage of withstanding temperatures of up to 150°C without much change in actuating distance when the right magnets are used. The basic application of position sensing holds good for many of the requirements and displays that a dashboard needs to display and for a fuel cap sensing application, a magnet on the cap and a sensor on the mouth of the fuel entry point is a simply way to achieve this. Both normally open or normally closed reed sensors can be used, based on the circuit logic and safety requirements.
Applications are classified as Position Sensing, Pulse Counting, Electromagnetic or Relay, Temperature Sensing or Magnet Biasing types. This application is classified as follows and the link gives more information on best practices to help select the most suitable AT band and matching magnet.
The Reed Switches and Sensors used in such applications need to be robust, durable and efficient in meeting a high life expectancy. Our engineers work hard in life testing our products under various conditions, and our intention is to ensure end product durability and life. Although we wouldn’t want to restrict any of our products for use in only certain applications, the recommended products for use in this application are listed below.
R4 Ultra-miniature SMD Reed Sensor
|Omni polar, normally open (NO), 12.5 mm SMD pitch. 10W switching capability at 0.5...Continue reading|
R2B, Normally Closed, SMD Reed Sensor
|Polarity Sensitive, Normally Closed (NC), 19.5 mm SMD and low-profile SMD pitch. 10W switching...Continue reading|