In-line real time air monitor

Patent · Thu Jan 01 00:00:00 EST 1998

OSTI ID:871705

Wise, Marcus B ^[1]; Thompson, Cyril V ^[2]

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1. Kingston, TN
2. Knoxville, TN

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.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• DOE Contract Number: AC05-96OR22464
• Assignee: Lockheed Martin Energy Research Corporation (Oak Ridge, TN)
• Patent Number(s): US 5780717
• OSTI ID: 871705
• Country of Publication: United States
• Language: English

Related Subjects

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/