.~ Analyzer or composition sensor of work, work atmosphere or exhaust gas
(under subclass 36) Apparatus in which the control includes a device responsive to changes in the composition of work, of work atmosphere surrounding the work, or of exhaust material withdrawn from the work zone.
SEE OR SEARCH CLASS
34, Drying and Gas or Vapor Contact With Solids
557, for the automatic control of the humidity of the contacting gas in a drier or in gas-solid contact device.
165, Heat Exchange,
223+, for the automatic control of a combined heating and cooling system by a humidity sensor. 200, Electricity: Circuit Makers and Breakers
61.03, for a smoke responsive switch.
236, Automatic Temperature and Humidity Regulation,
44, for a control system responding to and controlling humidity.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,
50+, for (a) an analytical or analytical-control device determining qualitatively or quantitatively the presence of one or more chemical constituents of a material which involves a chemical reaction or (b) combination of a test or measurement and means for regulating a chemical reaction.
76, for the control of a burner, per se, by a means responsive to the composition of the combustion products of the burner.