G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 21/27 (2006.01) B01F 5/10 (2006.01) B01F 15/00 (2006.01) C02F 1/00 (2006.01) E04H 4/14 (2006.01) G01N 21/05 (2006.01) G05D 21/02 (2006.01) C02F 1/76 (2006.01)
Patent
CA 2169248
A chemical monitoring and controlling system for a reservoir of water having a recirculating water line, comprises a photometric analyzer including a sample cell in fluid communication with the recirculating water line for holding a sample of water from the reservoir, the analyzer providing a first output signal indicative of the concentration of chemical in the water sample; at least one coloring reagent supply means in fluid communication with the sample cell; fluid control means for controlling the supply of water and coloring reagent to the sample cell; comparator means coupled to the analyzer for comparing the first output signal with a predetermined reference value and providing a second output signal proportional to the difference therebetween when the first output signal varies from the predetermined reference value; and feed control means responsive to the second output signal for regulating supply of the chemical from a dispenser to the reservoir of water such that the concentration of the chemical therein reaches the predetermined reference value. The sample cell comprises a housing defining a sample chamber for containing the water sample in admixture with the coloring reagent and an air chamber communicating with the sample chamber, a water inlet and at least one coloring reagent inlet for receiving predetermined quantities of water and coloring reagent, the water inlet and the coloring reagent inlet merging into a tubular member having a constricted end portion opening into the sample chamber for discharging thereinto the mixture of water and coloring reagent, the constricted end portion providing uniform mixing of the water and the coloring reagent, and fluid discharge means for emptying the sample chamber.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Prive Etienne
Universite Laval
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