DEVICE FOR MEASURING ABSOLUTE HUMIDITY Russian patent published in 1994 - IPC

FIELD: analytical instrument engineering. SUBSTANCE: device has capacitive pickup-cell brought into frequency-setting circuit of high-frequency generator, one-input valve for introducing reference gas into pickup-cell, one-input valve for introducing gas under test into the pickup. Device also has drier, basic reversible counter, indication unit connected with information inputs of reversible counter, three-input AND circuits, control unit, measurement cycle counter, demultiplexers, ancillary reversible counters connected with outputs of demultiplexers. Device also has adder connected with outputs of ancillary reversible counters and set input of basic reversible counter, and decoder of command for clearing ancillary reversible counters. In each cycle the correction is renovated for a quarter, which takes into account temperature drift of high-frequency generator. Average delay of introduction of the correction doesn't excess over two cycles. EFFECT: improved precision of measurement. 3 cl