Measuring and testing – Sampler – sample handling – etc. – Capture device
Patent
1987-01-14
1989-05-23
Levy, Stewart J.
Measuring and testing
Sampler, sample handling, etc.
Capture device
G01N 114
Patent
active
048318876
ABSTRACT:
A device for automatically sampling liquids includes a reversible gas powered motor driving a reversible pump. There are included in lines supplying the driving gas to the motor control devices which cause the gas to drive the motor and the pump in one sense for a predetermined period of time to purge the pump and subsequently to drive the motor and the pump in the opposite sense to draw a sample of the liquid. The motor preferably has two inputs. During the initial period of time the driving gas is connected to the first input driving the pump in the first sense. Subsequently the control devices remove the supply from the first input and connect it to the second input driving the pump in the opposite sense for a predetermined period of time and then stopping the motor. The control device is then reset so that upon the following actuation of the motor it is driven again in the one sense. The control devices include a purge timer, a sample timer, and two bistable devices, one bistable device being associated with each timer. These are in turn linked to a time-counter which controls the interval between successive pairs of purging and sampling operations.
REFERENCES:
patent: 3039309 (1962-06-01), Vesper et al.
patent: 3795347 (1974-03-01), Singer
patent: 3924471 (1975-12-01), Singer
patent: 4023417 (1977-05-01), McClure
patent: 4037472 (1977-07-01), Gates
patent: 4418581 (1983-12-01), Jones
patent: 4604166 (1986-08-01), Weinberg et al.
Levy Stewart J.
Raevis Robert R.
Thames Water Authority
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