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:
Nov. 23, 2004
Filed:
Jul. 16, 2003
Takashi Masuda, Tokyo, JP;
Yasuhide Yoshikawa, Tokyo, JP;
Yamatake Corporation, Tokyo, JP;
Abstract
Disclosed is an intrinsically safe sensor signal processing circuit, permitting lower cost installation and eliminating potential hazard. In the combination of a sensor which measures physical value as process variables in hazardous environment and a safety barrier which is mounted in non-hazardous environment, an intrinsically safe sensor signal processing circuit features the safety barrier for case of mounting, wherein current limiting resistances are connected in series with the sensor and these resistances are also connected to either an output or an inverting input of OP Amps that are considered as a driver or a feeder of the sensor signal. The safety barrier can adopt blocking capacitors instead of said current limiting resistors.