Johnson Service Company

Johnson Controls Technology Company

Bruce R Schultz

Kirk P Henderson

Robert D Giese

Paul E Thoma

Thomas O Kautz

David N AbuJudom, Ii

Steven A Linstead

Roger V Hajny

Bruce E Kierstead

Robin D Shaffer

Frank J Stier

George Rudich

Paul H Froehling

Arthur Barootian

Ronald J Wenner

Gary F Oman

Fernando F Garcia

Kurt A Hoefert

Henkerikus C Van Eldick

George Lewis

A humidity detector has a sensor with an electrical characteristic that varies as a function of humidity and a transmitter circuit which produces an output signal in response to the capacitance of the sensor. The humidity detector is calibrated by alternately connecting devices in place of the sensor which simulate performance of the sensor at two reference humidity levels. While each device is present, the transmitter circuit is adjusted so that the output signal indicates the respective reference humidity level. Next, the sensor is connected to the transmitter circuit and exposed to a known humidity level. Then the transmitter circuit is adjusted so that the output signal indicates the known humidity level.

Humidity detector calibration method

The present method defines a plurality of individual temperature sensor cells on a single printed circuit board with a separate temperature detector mounted in each cell. The temperature response of each detector is characterized substantially simultaneously and the values for series and parallel trimmer resistors for each cell are determined from the temperature response of the detector for the cell. Then an automated machine attaches properly valued resistors in parallel and in series with each detector on the printed circuit board.

Temperature sensor manufacturing process

An enclosure for a film-type humidity sensing element includes identical enclosure members which snap together to form an enclosure with the humidity sensing element sandwiched between the members, each of the members including a lead mounting area on its inner surface for mounting the mounting ends of electrical leads, the leads being connected to contact portions of the humidity sensing element interiorly of the enclosure by a metal-filled conductive adhesive which is introduced into the enclosure through access openings after the enclosure members have been assembled together. The enclosure is adapted for mounting on a circuit board in both horizontal and vertical orientations and independently of the lead structure of the sensor assembly.

Enclosure for humidity sensing element

Environmental control module

Surface mounted environmental control module

A pivotal electrical connector for connecting a shape memory alloy element in the form of a coil spring to a fixed member, the connector including a strip of electrically conductive material having a clip or a pair of legs for securing the connector to one of the coils of the element. A pair of holes may be provided in the strip through which the coil is threaded. A rotational connector is provided in the strip for engaging the fixed member.

Shape memory actuator smart connector

Growing community of inventors

West Allis, WI, United States of America

Bruce R Schultz