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Title: In-line real time air monitor

Abstract

An in-line gas monitor capable of accurate gas composition analysis in a continuous real time manner even under strong applied vacuum conditions operates by mixing an air sample with helium forming a sample gas in two complementary sample loops embedded in a manifold which includes two pairs of 3-way solenoid valves. The sample gas is then analyzed in an ion trap mass spectrometer on a continuous basis. Two valve drivers actuate the two pairs of 3-way valves in a reciprocating fashion, so that there is always flow through the in-line gas monitor via one or the other of the sample loops. The duty cycle for the two pairs of 3-way valves is varied by tuning the two valve drivers to a duty cycle typically between 0.2 to 0.7 seconds.

Inventors:
 [1];  [2]
  1. (Kingston, TN)
  2. (Knoxville, TN)
Issue Date:
Research Org.:
LOCKHEED MARTIN ENERGY RES COR
OSTI Identifier:
871705
Patent Number(s):
5780717
Assignee:
Lockheed Martin Energy Research Corporation (Oak Ridge, TN) ORNL
DOE Contract Number:  
AC05-96OR22464
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
in-line; time; air; monitor; gas; capable; accurate; composition; analysis; continuous; manner; strong; applied; vacuum; conditions; operates; mixing; sample; helium; forming; complementary; loops; embedded; manifold; pairs; 3-way; solenoid; valves; analyzed; trap; mass; spectrometer; basis; valve; drivers; actuate; reciprocating; fashion; flow; via; duty; cycle; varied; tuning; typically; vacuum conditions; gas composition; mass spectrometer; duty cycle; sample gas; trap mass; air monitor; air sample; continuous basis; composition analysis; monitor capable; time air; solenoid valve; /73/422/

Citation Formats

Wise, Marcus B., and Thompson, Cyril V. In-line real time air monitor. United States: N. p., 1998. Web.
Wise, Marcus B., & Thompson, Cyril V. In-line real time air monitor. United States.
Wise, Marcus B., and Thompson, Cyril V. Thu . "In-line real time air monitor". United States. https://www.osti.gov/servlets/purl/871705.
@article{osti_871705,
title = {In-line real time air monitor},
author = {Wise, Marcus B. and Thompson, Cyril V.},
abstractNote = {An in-line gas monitor capable of accurate gas composition analysis in a continuous real time manner even under strong applied vacuum conditions operates by mixing an air sample with helium forming a sample gas in two complementary sample loops embedded in a manifold which includes two pairs of 3-way solenoid valves. The sample gas is then analyzed in an ion trap mass spectrometer on a continuous basis. Two valve drivers actuate the two pairs of 3-way valves in a reciprocating fashion, so that there is always flow through the in-line gas monitor via one or the other of the sample loops. The duty cycle for the two pairs of 3-way valves is varied by tuning the two valve drivers to a duty cycle typically between 0.2 to 0.7 seconds.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {1}
}

Patent:

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