Therm-o-disc, Incorporated

Donald G Cunitz

Bernd D Zimmermann

Tung-Sheng Yang

David Reynolds

Jared Starling

Larry L Russell

James M Krillenberger

Bradley D Funk

Bruce E Ankenman

Philip S Young

Jeffrey Mueck

A fluid flow rate sensor includes a detection circuit which generates a first signal corresponding to an output voltage of a bridge circuit, and a second signal corresponding to a fluid temperature. A control module can more accurately and quickly determine the fluid flow rate based on the first signal, the second signal and a look-up table. The look-up table includes a plurality of curves plotted according to data, indicating relationship among the fluid temperature, the output voltage and the fluid flow rate. The fluid flow rate sensor is inherently temperature compensated and has a shorter response time.

Fluid flow rate sensor and method of operation

A PTC circuit protection device to protect electronic devices against excessive temperatures and electrical currents. The device comprises a polymeric resistor element, a first electrode, and a second electrode. The polymeric resistor element changes resistance in response to temperature changes. The resistor element has an upper surface and a lower surface. The first electrode is in electrical contact with both the upper surface and the lower surface. The second electrode is in electrical contact with both the upper surface and the lower surface. The circuit protection device has a first effective area of resistance and a second effective area of resistance that is electrically in parallel with the first effective area.

PTC circuit protector having parallel areas of effective resistance

A thermal sensor incorporating an improved retention clip is disclosed herein. The improved retention clip is both easily fabricated from either sheet stock or wire stock and is designed to be easily and securely assembled to the sensor housing and provides a convenient easy to use retention system for attaching the sensor to a tubular or generally cylindrical conduit member. The retention clip includes a gently angled lead-in portion which aids in guiding the clip into the conduit with little force coupled with a more sharply angled retention portion that substantially increases the force required to dislodge the sensor once assembled. Additionally, the clips are designed to minimize contact surface engagement with the conduit so as to minimize crevice corrosion. Portions of the clips may be covered with a suitable material to further limit the possibility of localized corrosion as well as to insulate the clip from the conduit member while also resisting relative movement therebetween. An optional protector disc is also disclosed which serves to provide increased protection against damage to the sensor body.

Temperature monitoring assembly having a thermostatic control with mounting clip

The resistance of a thermal protector is varied by forming different sizes of holes therethrough to vary the area. The external size and shape of the thermal protector remains the same for ease of fixturing and mating with other parts.

Variable resistance thermal protector and method of making same

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Mansfield, OH, United States of America

Donald G Cunitz