Measuring and testing – Sampler – sample handling – etc. – Automatic control
Patent
1995-09-21
1997-01-21
Noland, Thomas P.
Measuring and testing
Sampler, sample handling, etc.
Automatic control
73 2331, 7386303, G01N 122
Patent
active
055961541
ABSTRACT:
An apparatus and method for maintaining a constant dilution ratio for a dilution probe used in a continuous emission monitoring system. The apparatus includes a regulator for regulating the flow of dilution gas to the probe, a mechanism for measuring changes in gas density of the emission gas and a mechanism for determining an adjusted flow rate for the dilution gas to the dilution probe based on the measured changes in gas density to control the dilution ratio. The method involves monitoring the gas density of the emission gas for a change in gas density. Upon the occurrence of a change in gas density, an adjusted flow rate of the dilution gas as required to control the dilution ratio is determined, and then the flow of dilution gas to the probe is adjusted to the adjusted flow rate. The use of the apparatus and method of the present invention provides a system capable of compensating for changes in gas density that does not require frequent calibration, is independent of the type of gas analyzer or gas constituent detection method used, and is able to be economically retrofitted into existing systems.
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Enviroplan, Inc.
Gridley Doreen J.
Noland Thomas P.
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