Electrochemical measuring cell for detecting hydride gases
First Claim
1. An electrochemical measuring cell for detecting hydride gases including arsine and phosphine, the electrochemical measuring cell comprising:
- a housing having an opening directed toward the hydride gas to be detected and defining an electrolyte chamber;
an electrolyte disposed in said electrolyte chamber;
said electrolyte containing sulphuric acid and silver sulphate as an electrolyte additive;
a carbon working electrode;
a reference electrode mounted in said electrolyte chamber so as to be in spaced relationship to said carbon working electrode; and
, a diffusion membrane permeable to said hydride gas mounted in said housing to define an interface between said hydride gas and said electrolyte chamber.
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Accused Products
Abstract
The invention is directed to an electrochemical measuring cell for detecting hydride gases, preferably arsine and phosphine. The measuring cell includes at least one working electrode (3) made of a catalytically inactive material and a reference electrode (4) in an electrolyte chamber (6) filled with an electrolyte containing sulphuric acid. The measuring cell is improved as to the cross sensitivity with respect to other toxic gases. The working electrode is configured as a carbon electrode (3) and an electrolyte additive of silver sulphate is provided in saturated solution in the electrode (9).
8 Citations
19 Claims
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1. An electrochemical measuring cell for detecting hydride gases including arsine and phosphine, the electrochemical measuring cell comprising:
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a housing having an opening directed toward the hydride gas to be detected and defining an electrolyte chamber;
an electrolyte disposed in said electrolyte chamber;
said electrolyte containing sulphuric acid and silver sulphate as an electrolyte additive;
a carbon working electrode;
a reference electrode mounted in said electrolyte chamber so as to be in spaced relationship to said carbon working electrode; and
,a diffusion membrane permeable to said hydride gas mounted in said housing to define an interface between said hydride gas and said electrolyte chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An electrochemical measuring cell for detecting hydride gases including arsine and phosphine, the electrochemical measuring cell comprising:
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a housing having an opening directed toward the hydride gas to be detected and defining an electrolyte chamber;
an electrolyte disposed in said electrolyte chamber;
said electrolyte containing phosphoric acid and a silver phosphate as an electrolyte additive;
a carbon working electrode;
a reference electrode mounted in said electrolyte chamber so as to be in spaced relationship to said carbon working electrode; and
,a gas-permeable membrane mounted in said housing to define an interface between said hydride gas and said electrolyte chamber. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification