A ph sensor with internal solution ground

G - Physics – 01 – N

Patent

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Details

G01N 27/416 (2006.01) G01N 27/401 (2006.01) G01N 27/403 (2006.01)

Patent

CA 2470474

The invention relates to an internal solution ground (502) for primary use with a pH sensor (500, 482), especially with a multi-sensing instrument (700, 900, 280, 480) monitoring a pH sensor (500, 482) and one or more additional secondary sensors (702, 484, 486, 488) having non-isolated circuits (710, 712, 481, 483, 485, 487). In one aspect, a pH sensor assembly (500) includes a pH electrode (108), a reference electrode, and an internal solution (ground wire (502). The internal solution ground wire (502) shares a liquid junction (122) with the reference electrode (108) but is protected by the reference fill solution (118). The internal solution ground (502) can be electrically isolated through a capacitor (902, 471, 473, 475) or, alternately, a capacitor (902, 471, 473, 475) and resistor (903) in parallel.

La présente invention concerne une mise à la masse d'une solution interne (502) destinée principalement à un capteur de pH (500, 482), en particulier avec un instrument multi-détection (700, 900, 280, 480) surveillant un capteur de ph (500, 482) et un ou plusieurs capteurs auxiliaires additionnels (702, 484, 486, 488) possédant des circuits non isolés (710, 712, 481, 483, 485, 487). Dans un aspect de cette invention un ensemble capteur de pH (500) comprend une électrode à pH (108), une électrode de référence et un fil de masse (502) de solution interne. Ce fil de masse (502) de solution interne partage un raccordement de liquide (122) avec l'électrode de référence (108) mais il est protégé par la solution (118) de remplissage de référence. La mise à la masse (502) de la solution interne peut être électriquement isolée par un condensateur (902, 471, 473, 475) ou, dans une alternative, par un condensateur (902, 471, 473, 475) et une résistance (903) montés en parallèle.

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