G - Physics – 01 – N
Patent
G - Physics
01
N
73/56
G01N 21/27 (2006.01) G01N 21/78 (2006.01) G01N 31/00 (2006.01) G01N 31/22 (2006.01)
Patent
CA 1127418
ABSTRACT An apparatus is disclosed for indicating the presence of one or more predetermined substances in a fluid. The fluid is passed through a duct (1) and the one or more predetermined substances reacts with one or more reagents to form a reacted zone having a colour different from the unreacted zone. An optical detection device (4,5) follows the boundary (2) of the zone (3) and its movement is controlled by control means (13). The velocity of the boundary (2) depends on the concentration of the substance(s) in the fluid. Indication means (19) receives a signal from the control means (13), which relates to the velocity of the boundary (2). If this velocity and hence the concentration exceeds a predetermined value, an alarm (18) is actuated. The apparatus may include a reference optical detection device (6,7) with provision in the form of a comparison unit (11) to effect comparison between the two optical detection devices (4,5 and 6,7). The apparatus can afford an accurate, countinuous indication of the presence of the predetermined substances.
324032
Dragerwerk Aktiengesellschaft
Fetherstonhaugh & Co.
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