(under subclass 1.01) Subject matter wherein either (a) the apparatus for proving or calibrating or (b) the device which is being proven or calibrated either (1) detects or measures the composition of, or some constituent or an identifying characteristic of a gas or gaseous mixture or (2) detects or determines the composition of, a constituent of, or a property of a liquid or a liquid suspension of a solid.
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.
53.01+, for liquid testing (e.g., liquid chromatography), per se.
73+, for detecting the moisture content of a material.
SEE OR SEARCH CLASS
204, Chemistry: Electrical and Wave Energy, 401, for fault testing of a sensor or a component of an electrolytic analysis and testing apparatus and subclass 408 for such an analysis or testing apparatus with means for temperature or pressure compensation.
250, Radiant Energy,
253+, for the detection of a gas either within or emanating from the earth by invisible radiation emanating from the gas naturally or as a result of irradiation by invisible radiation; and subclasses 336.1+ for testing of a gas by utilizing an electric signalling device detecting radiation induced or emitted naturally or detecting infrared, ultraviolet, X-ray, or gamma radiation or neutrons modified by the gas.
324, Electricity: Measuring and Testing, appropriate subclasses for testing an electrical property of a gas, in particular
464+, for analyzing gas using ionization effects.
338, Electrical Resistors,
34+, for a resistor, per se, which is responsive to the condition of a gas wherein no quantitative measurements of the gas are disclosed.
340, Communications: Electrical,
632+, for an electrical indicator providing a humanly perceptible signal representing a predetermined condition of a gas.
356, Optics: Measuring and Testing,
402+, for gas analysis utilizing a colorimeter to determine the shade or color of the gas.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,
50+, for an apparatus utilizing a chemical reaction to analyze gas.
436, Chemistry: Analytical and Immunological Testing,
68, for a process which utilizes a chemical reaction to analyze gas.
