Chemistry: molecular biology and microbiology – Measuring or testing process involving enzymes or... – Involving hydrolase
Patent
1994-10-05
1996-05-07
Russel, Jeffrey E.
Chemistry: molecular biology and microbiology
Measuring or testing process involving enzymes or...
Involving hydrolase
73 3102, 435807, 435808, 4352887, 4352871, 436167, C12M 134, C12Q 137, G01N 2151, G01N 2175
Patent
active
055145620
ABSTRACT:
A method for measuring the presence of traces of substance in air by providing in a cuvette a substrate reacting with the substance by changing its opacity, passing at a defined flow rate air from the air body to be checked through the substrate, measuring the development of opacity. A portable apparatus comprises a housing (1, 101) holding a cuvette (131) containing a substrate (3, 103), an inlet tube (28) leading to the bottom of the cuvette, a pump (13) sucking air from the cuvette through a flow monitor (138) controlling the pump, a spectrophotometer lamp (19, 119) and a photo-diode (20) on opposite sides of the cuvette (131), a monitor monitoring the level (4, 104) of the substrate in the cuvette, and a monitor (23, 123) monitoring the temperature of the substrate, a computer (24) receiving signals from the photodiode (20), the level monitor, and the temperature monitor to calculate a temperature and level compensated indication of the substrate opacity.
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B.o slashed.ving Bjarne
Nielsen Mads Christian Hage
Poulsen Johannes
Saugmann Grethe
Harrington James J.
Novo Nordisk A S
Russel Jeffrey E.
Zelson Steve T.
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