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:
May. 17, 2005
Filed:
Dec. 13, 2002
Chang-dong Feng, Long Beach, CA (US);
Joe N. Covey, Tustin, CA (US);
Beth Meinhard Covey, Tustin, CA (US);
Richard N. Baril, Huntington Beach, CA (US);
Roland H. Koluvek, Orange, CA (US);
Chang-Dong Feng, Long Beach, CA (US);
Joe N. Covey, Tustin, CA (US);
Beth Meinhard Covey, Tustin, CA (US);
Richard N. Baril, Huntington Beach, CA (US);
Roland H. Koluvek, Orange, CA (US);
Rosemount Analytical Inc., Anaheim, CA (US);
Abstract
The invention relates to an internal solution ground for primary use with a pH sensor, and preferably with a multi-sensing instrument monitoring a pH sensor and one or more additional secondary sensors having non-isolated circuits. In one aspect, a pH sensor assembly includes a pH electrode, a reference electrode, and an internal solution ground wire. The internal solution ground wire shares a liquid junction with the reference electrode but is protected by the reference fill solution. In one embodiment, the internal solution ground can be electrically isolated through a capacitor or, alternately, a capacitor and resistor in parallel.