Water Meter Flow Sensors

We’re talking about angle sensors and
water meter applications using NVE’s unique AAT-Series TMR sensors. With me is “Jaimie,”
in the NVE Application Center. AAT-Series sensors use high-output spintronic
Tunneling Magnetoresistors, or “TMR.” They come in ultraminiature, TDFN6 packages. The sensor measures angles around an axis
perpendicular to the package. The sensor has a wide mechanical air-gap tolerance,
and a low magnetic field requirement. The magnet creates flux lines
parallel to the package. As the magnet turns, the sensor provides two
sinusoidal outputs ninety degrees out of phase. This lets you determine position and direction. And smart water meters are a popular application? Absolutely. Here’s an example. A split-pole or bar magnet is attached to
the end of the water meter turbine shaft. The sensor is in a fixed position. As the turbine spins,
the sensor indicates its position. High sensor resistance
is ideal for battery operation. High sensitivity means more
precise output signals without amplification. So in summary, AAT advantages in water meters are: High output without amplification; Wide air-gap tolerance; Low magnetic field requirement; High resistance for low power—
40 kilohms or 1.25 megohms; and an ultraminiature package. Thanks, Jamie. Where can I get more information? Visit nve.com, or call us at 800-GMR-7141.

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