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Method for measuring a characteristic in a sample fluid

  • US 5,114,859 A
  • Filed: 04/22/1991
  • Issued: 05/19/1992
  • Est. Priority Date: 07/21/1988
  • Status: Expired due to Fees
First Claim
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1. A method for measuring a characteristic which is a function of the concentration of one or more chemical species in a sample fluid, by using a measuring device comprisinga sensor having a sensing surface part, anda chamber adapted to contain a conditioning fluid, the chamber being partly defined by a first wall part adapted to allow the sensor to pass through it and establish a seal around the sensor when the sensor traverses the first wall part, the sensor and the chamber being movable relative to each other so as to transfer the sensing surface part of the sensor through the first wall part from a position where the sensing surface part of the sensor is inside the chamber to a position where it is outside the chamber,the method comprisingexposing the sensing surface part of the sensor to a conditioning fluid in the chamber,moving the sensor and the chamber relative to each other so as to transfer the sensing surface part of the sensor through the first wall part and position it outside the chamber,exposing the sensing surface part of the sensor to a sample fluid,deriving the characteristic on the basis of a response generated by the sensor when the sensing surface part of the sensor is exposed to the sample fluid, and, optionally, a response generated by the sensor when the sensing surface part of the sensor is exposed to the conditioning fluid, anddiscarding the measuring device after one measurement of the characteristic.

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