Chemistry: electrical and wave energy – Processes and products – Vacuum arc discharge coating
Patent
1978-07-06
1979-04-17
Williams, Howard S.
Chemistry: electrical and wave energy
Processes and products
Vacuum arc discharge coating
G01N 2726
Patent
active
041499492
ABSTRACT:
Apparatus for measuring CO.sub.2 in serum with a single pH sensor of the electrolyte flow-through type, the sensor including a gas-permeable membrane selectively passing CO.sub.2 into an electrolyte filled space adjacent a pH sensing electrode for reacting with the electrolyte to produce a pH change therein. The electrolyte space is connected by a conduit to an electrolyte reservoir for flowing fresh electrolyte to and through the electrolyte space prior to a sample measurement. A stainless steel metal electrode directly contacts the electrolyte of constant composition in the conduit upstream of the pH sensor to derive a reference potential thereat. The potential across the pH sensor and the stainless steel electrode is monitored, differentiated, and the maximum value of the differentiated signal measured to determine the CO.sub.2 concentration.
REFERENCES:
patent: 3857771 (1974-12-01), Sternberg
patent: 3869354 (1975-03-01), Montalvo
Buzza Edmund E.
Lillig John E.
Beckman Instruments Inc.
Meads Robert R.
Shewmaker John R.
Steinmeyer R. J.
Williams Howard S.
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