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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. 3 figs.

Inventors:
;
Publication Date:
Research Org.:
Lockheed Martin Energy Research Corporation
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
672498
Patent Number(s):
US 5,780,717/A/
Application Number:
PAN: 8-838,954
Assignee:
Lockheed Martin Energy Research Corp., Oak Ridge, TN (United States)
DOE Contract Number:  
AC05-96OR22464
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 14 Jul 1998
Country of Publication:
United States
Language:
English
Subject:
40 CHEMISTRY; 54 ENVIRONMENTAL SCIENCES; REAL TIME SYSTEMS; ON-LINE MEASUREMENT SYSTEMS; GAS ANALYSIS; MASS SPECTROMETERS; SAMPLERS; DESIGN

Citation Formats

Wise, M B, and Thompson, C V. In-line real time air monitor. United States: N. p., 1998. Web.
Wise, M B, & Thompson, C V. In-line real time air monitor. United States.
Wise, M B, and Thompson, C V. Tue . "In-line real time air monitor". United States.
@article{osti_672498,
title = {In-line real time air monitor},
author = {Wise, M B and Thompson, C 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. 3 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {7}
}