Pollutant variation correcting system

• US 3,924,442 A
• Filed: 10/09/1973
• Issued: 12/09/1975
• Est. Priority Date: 10/09/1973
• Status: Expired due to Term

• Current Assignee: KVB Incorporated
• Original Assignee: Bernard P. Breen, Claude S. Lindquist, John R. White, Stephen E. Kerho
• Inventors: Kerho, Stephen E., Lindquist, Claude S., White, John R., Breen, Bernard P.
• Primary Examiner(s): Myracle, Jerry W.
• Application Number:
  US05/404,503
• Time in Patent Office: 791 Days
• Field of Search: 73/1R,23 23/254R,255R
• US Class Current: 73/23.21
• CPC Class Codes: G01N 33/0006 Calibrating gas analysers

Abstract

A system for continuously measuring volumetric concentrations of gas which is automatically self-calibrating and will correct volumetric measurements to a predetermined reference level. This system performs corrections automatically by electronically operating on signals generated by analyzers which are coupled to probes disposed within the sample.

Claims

1. A system for monitoring effluent gas and for determining the concentration of at least one gas in said effluent gas at predetermined reference conditions comprising:

a. sampling means for sampling said effluent gas and for providing a sample;

b. an analyzing means for analyzing said sample to determine the concentration of at least one gas in said sample, and for generating at least a first electrical signal representative of the concentration of a first gas, said analyzing means being coupled to said sampling means; and

, c. correcting means for electrically correcting at least said first electrical signal from said analyzing means to a standard reference gas level, said correcting means being electrically coupled to said analyzing means whereby, said corrected electical signal may be displayed or otherwise monitored, so that the concentration level of at least one gas in said effluent gas may be absolutely determined.

2. The system described in claim 1, wherein said sampling means includes a pump for obtaining said sample and for forcing said sample through said system, a filter for separating particulate matter from said sample, a condensing means for removing moisture from said sample and a purge means for purging said sampling means.

3. The system described in claim 1, wherein said correcting means electrically performs the following computation:

4. The system described in claim 1 Having a calibrating means for automatically and periodically comparing a signal generated using a reference calibration gas with a predetermined calibration reference signal provided by said calibration means to generate an error signal, said calibrating means including means for resetting the analyzer means, as required, to obtain a zero error signal.

5. The system described in claim 4, wherein said calibrating means calibrates said analyzing means for zero conditions.

6. The system described in claim 4, wherein said calibrating means calibrates said analyzing means for span conditions.

7. A system for monitoring effluent gas for determining the concentration of at least a first and second gas in said effluent gas comprising:

a. a sampling means for sampling said effluent gas and for providing a sample;

b. a plurality of analyzing means for analyzing said sample to determine the concentration of at least said first and second gas in said sample, and for generating at least a first electrical signal representative of the concentration of said first gas, and a second electrical signal representative of the concentration of said second gas, said analyzing means being coupled to said sampling means; and

c. a correcting means for electrically correcting at least said first electrical signal from said analyzing means to a standard reference gas level, said correcting means being electrically coupled to said analyzing means whereby, said corrected electrical signals may be displayed or otherwise monitored, so that the levels of concentrations of at least said first and second gas in said effluent may be known.

8. The system described in claim 7, wherein said correcting means comprises a summing means coupled to a dividing means.

9. The system described in claim 8, including a means for producing a constant reference signal corresponding to a predetermined corrected excess of reference gas, wherein said first electrical signal is summed with said reference signal in said summing means.

10. The system described in claim 9, wherein the output from said summing means is divided by said second electrical signal in said dividing means.

11. The system described in claim 7, wherein said sampling means includes a pump for obtaining said sample and for forcing said sample through said system, a filter for separating particulate matter from said sample, a condensing means for removing moisture from said sample and a purge means for purging said sampling means.

12. The system described in claim 7, wherein said correcting means electrically performs the following computation:

13. The system described in claim 7 having a calibrating means for automatically and periodically comparing a signal generated using a reference calibration gas with a predetermined calibration reference signal provided by said calibration means to generate an error signal, said calibrating means including means for resetting the particular analyzer being calibrated, as required, to obtain a zero error signal.

14. The described in claim 13, wherein said calibration means calibrates said analyzing means for zero conditions.

15. The system described in claim 13, wherein said calibrating means calibrates said analyzing means for span conditions.