| 摘要 |
<p>A metering device for determining and controlling the content of a gas in a liquid, e.g. chlorine gas in water, comprises a pilot-operated check valve in a gas feed line, inserted between a vacuum diaphragm valve and an ejector. The metering device also comprises a concentration meter located on a main, a liquid flow meter, an electronic gas-to-liquid ratio setter correction controller coupled to a device for setting the concentration of the gas in the liquid, coupled to the concentration meter and coupled, via an actuating mechanism, to the gas-to-liquid ratio setter. Connected to the latter is an electronic gas-to-liquid flow ratio controller associated with signal distributors and an actuating mechanism of a gas flow controller. The invention permits the accuracy of metering a gas in a liquid, e.g. chlorine gas in drinking water, to be substantially enhanced, whereby the quality of drinking water is considerably improved.</p> |
