Cleaning method for optical surfaces of urine analyzers
First Claim
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1. A method for cleaning and preventing the buildup of residue on the optical surface of an analyzer for urine which analyzer has such an optical surface through which light passes and which analyzer also is equiipped with a conductive liquid level sensor which method comprises contacting such optical surface with a aqueous formulation comprisinga quaternary ammonium or phosphonium salt of the formula:
- ##STR3## wherein R1 is straight or branched chain alkyl of 7 to 24 carbon atoms;
R2, R3 and R4 are lower alkyl of 1 to 4 carbon atoms, X+ is N or P and Y- is an anion;
2) a non-ionic siirfactant, and3) a divalent ion at a concentration of from 0.05 to 0.7 mM.
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Abstract
Disclosed is a method for cleaning optical surfaces, such as those in a urine analyzer, which surfaces come into repeated contact with urine test samples. The method involves contacting the optical surfaces with an aqueous solution of a quaternary ammonium or phosphonium salt, a non-ionic surfactant and a divalent ion.
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6 Claims
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1. A method for cleaning and preventing the buildup of residue on the optical surface of an analyzer for urine which analyzer has such an optical surface through which light passes and which analyzer also is equiipped with a conductive liquid level sensor which method comprises contacting such optical surface with a aqueous formulation comprisinga quaternary ammonium or phosphonium salt of the formula:
- ##STR3## wherein R1 is straight or branched chain alkyl of 7 to 24 carbon atoms;
R2, R3 and R4 are lower alkyl of 1 to 4 carbon atoms, X+ is N or P and Y- is an anion;2) a non-ionic siirfactant, and 3) a divalent ion at a concentration of from 0.05 to 0.7 mM. - View Dependent Claims (2, 3, 4, 5)
- ##STR3## wherein R1 is straight or branched chain alkyl of 7 to 24 carbon atoms;
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6. A method for cleaning optical surfaces of a urine analyzer through which light passes and which come into repeated contact with urine test samples which method involves contacting the optical surface with a solution comprising in aqueous solution cetyltrimethylammonium hydrogen sulfate, magnesium chloride hexahydrate and an iso-octyl phenoxy polyethoxy ethanol surfactant.
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