Title: Relative humidity control

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Claims: We claim:

1. Apparatus for measuring and controlling the relative humidity of exhaust air from an industrial drier including means for passing a sample of exhaust air from said drier past a dry bulb and a wet bulb thermocouple electric circuit means for deriving a voltage providing a measure of the relative humidity of air in said sample from the said thermocouples, control means responsive to said voltage arranged to control the amount of exhaust air discharged from the drier to atmosphere, means to dip said wet bulb thermocouple cyclically in a container of water, a continuously cycling timer system controlling the dipping of said wet bulb thermocouple and acting to delay the application of said voltage to the said control means whereby said control means responds to said voltage only after the wet bulb thermocouple has equilibrated with the exhaust air sample after dipping and to control the duration of operation of said control means.

2. Apparatus as claimed in claim 1 wherein said supply of water is provided by condensate from a drier, means being provided to cause a portion of the water in said container to be displaced at each dipping, further means being provided to replenish said container automatically prior to the next dipping.

3. Apparatus as claimed in claim 1 wherein the means to dip said wet-bulb thermocouple include a solenoid the armature of which is connected by lever means to said wet-bulb thermocouple.

4. Apparatus as claimed in claim 1 wherein said continuously cycling timer includes three timers interconnected in such a manner that as each timer times out it acts to start the next timer in the cycling sequence.

Other info:

Inventors: Chaikin, Malcolm (Centennial Park, AU)
Nossar, Mstislav S. (Peakhurst, AU)

Application Number: 774014
Filing Date: 1977-03-03
Publication_date: 1978-12-12
Assignee: Unisearch Limited (AU)
Primary Class(es): 236/44A 73/77, 73/335.02, 73/335.08
Other Classes:
US Patent Ref:

2128176	Aug, 1938	Bast	236/44.
2504278	Apr, 1950	Read	236/44.
2754063	Jul, 1956	Kersten	236/44.
2935009	May, 1960	Cloud	236/44.
3603135	Sep, 1971	Kawaguchi	73/77.

Other Refs:
Primary Examiner: Gordon, Clarence R.
Assistant Examiner:
Attorney: