Continuously operated gas analyzer

Details Continuously operated gas analyzer Continuously operated gas analyzer

1992-04-16

1993-09-21

Williams, Hezron

Measuring and testing

Gas analysis

With compensation detail

G01N 2716

Patent

active

052458571

ABSTRACT:
The gas analyzer comprises a detector (3) which is dependent upon the mass flow, with a suction device (4) at the detector output. The detector output is connected to a vacuum regulating circuit (6) which maintains the vacuum constant, generated by the suction device (4), at the detector output in relation to the atmospheric pressure. The detector (3) is preceded by a choke (2) in the pipe-line for the gas to be measured. A second choke (11) is connected in parallel, by way of by-pass, to the series arrangement of the first choke (2) and the detector (3). A further (third) choke (1) is connected in advance of the common gas inlet (12, 13). A second vacuum regulating circuit (14) is connected to the common connection point and maintains the pressure constant, prevailing at said connection point, in relation to the atmospheric pressure. The two vacuum regulating circuits (6, 14) each comprise a piezoelectric pressure sensor (18a, 18b), a proportional/Integral controller (20a, 20b) and an electropneumatic control element (21a, 21b).

REFERENCES:
patent: 4341108 (1982-07-01), Warncke et al.
patent: 4379402 (1983-04-01), Harmann, III

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