Moog Gmbh

Zevex, Inc.

James Holden

David J McNally

Raymond Druce

Bruce M Davis

A power supply () for providing a desired current to an electric load () broadly comprises: a current limiter () for providing a desired current; a current sensor () for determining the actual current supplied by the current limiter and providing a feedback signal () to the current limiter for causing the current limiter to reduce the error between the desired and the actual currents; and a test circuit () for temporarily changing the actual current sensed by the current sensor to a level different from the desired current for causing the current limiter to adjust the magnitude of the current provided thereby; whereby the operation of the power supply may be tested. The invention also provides an improved method of operating such a power supply.

Power supplies with testable current limiters, and methods of operating same

A noninvasive ultrasonic liquid level indicator for indicating the level of a liquid in a reservoir is disclosed which comprises an ultrasonic transducer assembly, structures for holding the transducer assembly in a dry coupled attachment with the reservoir at selectable locations against an exterior surface of the reservoir, and a monitor for revealing a change in liquid height. The transducer assembly conveys signals regarding changes in liquid height to a monitor which warns the user in time to add more liquid or replace the reservoir before the liquid supply 'runs dry.' The manners for holding the assembly in place include, but are not limited to, a strap, a clamp, or adhesive material, such as tape. These allow the user to selectively place the transducer assembly along the reservoir at the desired triggering point.

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Sandy, UT, United States of America

James Holden