Dennis E Francoeur

US Patent:

47421959, May 3, 1988

Filed:

Dec 2, 1985

Appl. No.:

6/803810

Inventors:

Cal L. Bryant - Bartlett IL
David W. Vrona - Glen Ellyn IL
Dennis E. Francoeur - Glendale Heights IL
Paul G. Janitch - Lombard IL

Assignee:

Magnetrol International Incorporated - Downers Grove IL

International Classification:

H01H 904

US Classification:

200 84C

Abstract:

A process instrument enclosed in a hermetically sealed housing for indicating and controlling a measured variable, such as the level in a tank. The instrument includes magnetically operated electrical switches actuable between open and closed positions in response to the measured variable. The electrical switches used are capable of switching current levels on the order of 10 Amps.