(under subclass 1.02) Subject matter wherein either (a) the apparatus for proving or calibrating the device or (b) the device which is being proven or calibrated is an apparatus for detecting or measuring the composition of or some constituent of a gas or gaseous mixture.
SEE OR SEARCH THIS CLASS, SUBCLASS:
23.2+, for a gas analyzer or sensor, per se, in particular subclasses 23.21+ for a gas analyzer including means for making a correction for an undesirable variation in a condition within an apparatus or in a test result due to such condition.
SEE OR SEARCH CLASS
204, Chemistry: Electrical and Wave Energy,
400+, for an electrochemical gas sensor, per se.
324, Electricity: Measuring and Testing, particularly 464+, for analyzing gas using ionization effects and appropriate subclasses for testing gas by measuring impedance, admittance, and related quantities.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,
50+, for an apparatus utilizing a chemical reaction to analyze a gas, particularly subclass 89 for gas chromatography.
436, Chemistry: Analytical and Immunological Testing, particularly
68, for a process utilizing a chemical reaction for determining the gases in the blood and subclasses 161+ for chromatography.
