Radiant energy – Fluent material containment – support or transfer means – With irradiating source or radiating fluent material
Patent
1984-05-16
1986-02-11
Anderson, Bruce C.
Radiant energy
Fluent material containment, support or transfer means
With irradiating source or radiating fluent material
250435, G01N 2100, G01N 2300
Patent
active
045700737
ABSTRACT:
An ionization detector for detecting a vapor constituent uses a first mode of operation in which only the vapor carried by ambient air is conducted through the ionization detector and a second mode of operation in which the outlet line from the ionization detector is connected to direct the exhaust gas flow from the ionization detector through a desiccant cartridge to remove humidity from the gas flow exiting from the ionization detector. The dehumidified gas with the constituent to be detected is then reintroduced into the input of the ionization detector to provide an improved sensitivity of the detector to the constituent. An alternate first and second operating mode cycle is provided to produce an increased output level of constituent detection from the ionization detector. This increased output level can be arranged to initiate an alarm operation for the vapor constituent being detected even at a very low constituent concentration.
REFERENCES:
patent: 3835328 (1974-09-01), Harris et al.
patent: 4053775 (1977-10-01), Franklin
patent: 4233126 (1980-11-01), Garcia
Anderson Bruce C.
Halista Mitchell J.
Honeywell Inc.
Joike Trevor B.
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