Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1976-10-21
1977-12-20
Queisser, Richard C.
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
73 23, 261107, G01N 3106
Patent
active
040634469
ABSTRACT:
Method and apparatus for detecting minute traces of a gas in the PPB range (.mu.g.m.sup.-3) by pumping a gas mixture through a non-specific gas detector measuring cell and displaying and/or recording the signals generated by the measuring cell. For zero point control, the looked-for constituent in the gas mixture is eliminated therefrom by passing the gas mixture through an activated charcoal filter in which the looked-for constituent is retained, and pumping the cleaned gas mixture through the gas detector. For calibration, a liquid of a type corresponding to the looked-for constituent is evaporated in an evaporator, and a gas mixture of a predetermined concentration is pumped through the measuring cell. For quick calibration, the liquid is continuously evaporated in the evaporator, and during measuring or zero controls this evaporated gas is vented to the atmosphere. Flow rates are adjusted by means of capillary systems. Measuring, zero control and calibration cycles may be initiated automatically through a program controller.
REFERENCES:
patent: 2965842 (1960-12-01), Jacobson
patent: 3309021 (1967-03-01), Powers
patent: 3611790 (1971-10-01), Brouwer et al.
patent: 3888112 (1975-06-01), De Leeuw et al.
patent: 3954920 (1973-05-01), Heath
Kreitman Stephen A.
Queisser Richard C.
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