Chemistry: electrical and wave energy – Processes and products – Vacuum arc discharge coating
Patent
1975-11-07
1977-03-15
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
Vacuum arc discharge coating
128 2E, 204195G, G01N 2730, G01N 2736
Patent
active
040123081
ABSTRACT:
An electrochemical combination electrode assembly particularly adapted for measuring the pH of body portions of a living subject, such as skin, hair, and the like, and which can be operated in any vertical, inclined or horizontal orientation. The assembly comprises a pH-indicating glass electrode supported within a tubular plastic container and includes a generally flat, pH-sensitive structure at a sensing end of the assembly. Conventional indicating and reference half-cell electrodes are supported in separate reservoirs of the assembly containing internal and reference electrolytes, respectively. The upper ends of the reservoirs are sealed by elastomeric plugs which compensate for differing coefficients of expansion within the assembly and coact with the electrolytes to prevent formation and migration of air bubbles to the sensing end of the assembly. In addition, a capillary passage is situated between the top of the internal electrolyte and the seal therefor to accommodate expansion of the internal electrolyte. A liquid junction structure, comprising a plurality of capillary paths, is spaced around the pH-sensitive structure and connects the reference electrolyte with the sample to be measured. A conductive cap, disposed over an end opposite the sensing end of the assembly and electrically connected to the reference half cell, shields the assembly from outside electrical interference and additionally provides a handle for hand manipulation of the assembly.
REFERENCES:
patent: 3188285 (1965-06-01), Watanabe
patent: 3551315 (1970-12-01), Friconneau et al.
patent: 3677925 (1972-07-01), Tamate et al.
Jerrold-Jones Paul
Krull Irwin H.
Beckman Instruments Inc.
Kaplan G. L.
Meads R. R.
Shewmaker J. R.
Steinmeyer R. J.
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