Gas analyzer with regulated measurement gas feed and dynamic dil

Details Gas analyzer with regulated measurement gas feed and dynamic dil Gas analyzer with regulated measurement gas feed and dynamic dil

1994-10-07

1996-01-30

Raevis, R.

Measuring and testing

Sampler, sample handling, etc.

Automatic control

137 93, 137893, G01N 2750

Patent

active

054873126

ABSTRACT:
A choke-bypass system is arranged upstream of the gas analyzer so as to generate a constant input pressure at the gas analyzer. The measurement range of the gas analyzer can be expanded considerably beyond the standard range while maintaining accuracy of measurement when the measurement gas is diluted with an inert gas above a given gas concentration threshold in such a way that the gas concentration in the gas analyzer remains constant. To this end, a dilution gas line (12) with a control valve (13) for continuous dilution of the measurement gas with the inert gas is connected to the choke-bypass system (1), (2), (3), (6). Further, the detector (3) of the gas analyzer is connected on the output side via a computer (10) with a dilution regulator (15) which readjusts the flow of inert gas via the control valve (13) in such a way that the amplified detector output signal is maintained at a given reference value, wherein the measurement gas flow is increasingly diluted as the measurement gas concentration increases. The dilution is then measured by a flow meter (14) arranged in the dilution gas line (12) and this measurement signal is processed together with the detector signal in a computer (10) connected with the detector (13) and dilution regulator (15) to form the analysis measurement.

REFERENCES:
patent: 3870065 (1975-03-01), Minns, Jr.
patent: 3975947 (1976-08-01), Kruishoop

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