The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 03, 1989
Filed:
Sep. 17, 1987
William M Duncan, Asheville, NC (US);
George E Glass, Asheville, NC (US);
Jeffrey L Johnson, Fletcher, NC (US);
Edward A McMillan, Fletcher, NC (US);
Frank S Maney, Waynesville, NC (US);
James R McConnell, Jr, Arden, NC (US);
Kenneth P Roberts, Asheville, NC (US);
Timothy R Sanders, Asheville, NC (US);
Square D Company, Palatine, IL (US);
Abstract
A modular switch device includes a housing enclosing an interconnected control module, a display module and a power module. A sensor module supplying analog data signals from one of a temperature or pressure sensing element connects to the control module through a passage in the housing. A user connects his electrical wires and electrical power to the electrical assembly within the housing through an opening. The user can select between AC and DC switched output modules and the presence or absence of a 4-20 milliampere output module by plugging and unplugging same from wells provided in the housing. The manufacturer and user thus can modify the standard housing, which includes an internal electrical assembly to be a pressure or temperature switch and to provide selected output switch characteristics by applying and removing selected sensor and output modules thereto. The interconnection between the sensor module and the control module includes particular leads carrying analog data signals and serial digital information signals. The control module includes one analog to digital converter and control means in the form of a microprocessor.