Electricity: measuring and testing – Electrolyte properties – Using a ph determining device
Reexamination Certificate
2005-05-17
2005-05-17
Le, N. (Department: 2858)
Electricity: measuring and testing
Electrolyte properties
Using a ph determining device
C324S444000, C324S446000
Reexamination Certificate
active
06894502
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.
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Baril Richard N.
Covey Beth Meinhard
Covey Joe N.
Feng Chang-Dong
Koluvek Roland H.
Le N.
Rosemount Analytical Inc.
Teresinski John
Westman Champlin & Kelly P.A.
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