A constant-volume liquid-feeding metering method and device for cod detection
A metering device and liquid feeding technology, applied in measurement devices, color/spectral characteristics measurement, material analysis by optical means, etc., can solve problems affecting the measurement accuracy of COD value, reduce the possibility of corrosion, and ensure accuracy. , The effect of continuous volume extraction
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[0023] see figure 1 and figure 2, a constant-volume liquid-feed metering device for COD detection in the present invention, comprising a piston pump 1, a metering tube 2, etc., the metering tube 2 is vertically connected between the piston pump 1 and the multi-way solenoid valve 14 through a sealing material, and the metering tube 2 is a cylinder with a certain volume, and its material is transparent quartz glass. The upper end of the metering tube 2 is connected to the piston pump 1 and the lower end is connected to the multi-way solenoid valve 14 . A photometer fixing ring 3 is arranged outside the tube wall of the metering tube 2. The photometer fixing ring 3 is empty on the metering tube 2 and can move up and down along the metering tube 2. The photometer fixing ring 3 is coaxially sleeved on the tube of the metering tube 2. Outside the wall, the photometer fixing ring 3 is made of steel. The photometer fixing ring 3 is fixedly connected to the liquid level photometer ...
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