Radiation-sensitive control for the concentration of a chemical

Claim 2

A control for the disinfectant concentration in a swimming pool, comprising; means for taking a sample of the water, a metering chamber for receiving said sample, a peristaltic pump for injecting a metered amount of indicator into the chamber, means within the chamber for stirring the contents of the chamber, electromagnetic means for operating said means for stirring, means for determining the color intensity of the sample and indicator after operation of said means for stirring, means for comparing a signal dependent on the color intensity with a reference signal, means for controlling a chlorine injector in dependence on the comparison, a motor, and cam-operated sWitches cyclically controlled by the motor for controlling the timed relationship between taking of the sample, injecting the indicator, and controlling the chlorine injector.

Claim 3

Apparatus for controlling the disinfectant infectant concentration in swimming pool water, comprising; means for repetitively obtaining successive samples from a recirculating line of said swimming pool, means for receiving a measured amount of said sampled water, first means for injecting a measured amount of disinfectant indicator into said means for receiving, means for measuring the concentration of disinfectant in said measured sample, second means for injecting a measured shot of disinfectant into said swimming pool water, and means for controlling said second means to inject a measured shot of disinfectant into said pool if the measured concentration of disinfectant is below a threshold concentration, and not to inject a shot if the said measured concentration is above the threshold concentration, the means for obtaining samples being inactive to take a successive sample until a delay time has elapsed since disinfectant was injected into the pool.

Claim 4

Apparatus for controlling the disinfectant infectant concentration in swimming pool water, comprising; means for repetitively obtaining successive samples from a recirculating line of said swimming pool, means for receiving a measured amount of said sampled water, first means for injecting a measured amount of disinfectant indicator into said means for receiving, means for measuring the concentration of disinfectant in said measured sample, second means for injecting a measured shot of disinfectant into said swimming pool water, and means for controlling said second means to inject a measured shot of disinfectant into said pool if the measured concentration of disinfectant is below a threshold concentration, and not to inject a shot if the said measured concentration is above the threshold concentration, the means for obtaining samples being inactive to take a successive sample until a delay time has elapsed since disinfectant was injected into the pool.

Claim 5

Apparatus for controlling disinfectant concentration as set forth in claim 2 wherein said second means for injecting includes a peristaltic pump controlled by said means for measuring.

Claim 6

Apparatus for controlling disinfectant concentration as in claim 2 wherein said means for repetitively obtaining samples receives said samples from a location wherein the disinfectant concentration is the lowest.

Claim 7

Apparatus for controlling disinfectant concentration as in claim 2 wherein said means for repetitively obtaining samplings includes means for flushing said means for receiving prior to each successive sample.

Claim 8

Apparatus for controlling disinfectant concentration as in claim 2 wherein said first means includes a fixed volume chamber, first valve means for supplying said chamber with said indicator and for retaining said indicator in said chamber, and second valve means for admitting said indicator from said chamber into said means for receiving.

Claim 9

Apparatus for controlling disinfectant concentration as in claim 2 further comprising means for actuating said means for measuring for a predetermined time interval during each repetitive sampling.

Claim 10

Apparatus for controlling disinfectant concentration as set forth in claim 2 further comprising means for discharging the measured amounts of sampled water and indicator to waste and not to the pool after measuring the disinfectant concentration.

Claim 11

Apparatus for controlling disinfectant concentration as set forth in claim 2 wherein said receiving means includes a stirrer and electromagnetic means for vibrating said stirrer to mix the water with the indicator prior to measuring.