Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Means for analyzing gas sample
Patent
1983-12-13
1987-05-12
Richman, Barry S.
Chemical apparatus and process disinfecting, deodorizing, preser
Analyzer, structured indicator, or manipulative laboratory...
Means for analyzing gas sample
73 23, 204406, 422 98, 436136, G01N 2700
Patent
active
046648860
ABSTRACT:
A trimode gas detection instrument having three operating modes, one which monitors the level of combustible gases, a second which monitors oxygen, and a third which monitors the displacement of air by an unknown gas. Only two sensors are used, a combustible gas sensor and an oxygen sensor. A switch selects the input to a readout so that the user can quickly observe the concentration readings in any of the three modes. In the depletion mode the readout is calibrated in relation to the inverse of the normal concentration of oxygen in air--i.e., zero depletion corresponds to an oxygen concentration of 21%. In the event that an unknown gas displaces air in a sample atmosphere, concentration of the unknown gas appears on the readout, such that zero oxygen corresponds to a concentration of 100% unknown gas.
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Miller et al.; Oxygen Deficiency Hazards Associated with Liquified Gas Systems: Derivation of a Program of Controls; NTIS Report No. FNAL-TN-1163 Jan. 1983.
Fruhwald John M.
Novack Robert L.
Bacharach, Inc.
Gzybowski Michael S.
Richman Barry S.
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