Dosing pump 4-channel

Description

A dosing pump is a small metering pump that delivers a set volume of liquid, such as fertiliser, on a schedule; a four-channel unit does this for four solutions. The CDC's Engineering and Administrative Recommendations for Water Fluoridation, published in 1995, set out how metering pumps in drinking water plants should be sized, installed and watched. The chemical in that setting is fluoride, but the recommendations are about the pump. Size comes first. For greatest accuracy, the CDC says a metering pump should be sized so the dose it normally delivers sits near the midpoint of its range, and pumps should always operate between 30 and 70 percent of capacity. Oversized pumps should not be used, because a setting that is too high can cause a serious overfeed; undersized pumps, on the other hand, give erratic levels. The second concern is dosing when nothing is flowing. The CDC requires the feed system to be interlocked so it cannot run unless water is being produced, for example by wiring the metering pump in series with the main pump, and it must be physically impossible to plug the metering pump into an outlet that is always live. The priming switch should be spring-loaded so the pump cannot be started by mistake with the switch in the priming position, and two antisiphon devices are required on the feed line. The third is to measure what really left the container. Chemical containers should sit on scales with daily weights recorded, because marking a level on the side of a day tank is not an adequate way to monitor an acid feed system. At home the equivalent is checking how much solution has actually gone rather than trusting the programmed volume. Finally, the CDC expects every plant to have procedures for an overfeed: shut down the equipment, notify the state officials responsible, flush out the lines holding the high concentration and warn the public not to drink the water. None of these figures is a dose for any aquarium product; they describe how a metering pump should be run.

Source

• cdc.gov — https://www.cdc.gov/mmwr/preview/mmwrhtml/00039178.htm

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