Electronic Design

Reliable Liquid Sensors Require No External Power

The new LS-Series liquid-level sensors serve as an alternative to costly Hall-effect sensors. The manufacturer also says that they're more reliable than mechanical switches. Made from corrosion-resistant materials, these devices feature magnetic floats that activate reed switches when liquid levels rise or fall. Then, they provide an output signal. These magnetically operated, hermetically sealed proximity sensors require no external power, either.

Designers can remotely place them to isolate the reed switch electrically, with greater than 1000 VDC isolation, and mechanically away from fluids. They can be made from polypropylene for use in water, and dilute acids or polyamide for use in oil, petrol, and brake fluid. Produced in a variety of configurations, the reed sensors are offered in Form A and Form B types with various connector options. They're available now, priced from $0.97 each depending upon type and quantity.

MEDER Electronic Inc., 766 Falmouth Rd., P.O. Box 2207, Mashpee, MA 02649; (508) 539-0002; fax (508) 539-4088; e-mail: [email protected]; Internet: www.meder.com.

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