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| Should I use flow proportional or timed sampling? |
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| During different times of year, some applications will require flow proportional sampling. Other applications require samples to be drawn on a strict set time. (24 hour composite sampling for example.) |
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| To achieve flow proportional sampling most automatic samplers are equipped or offer an add on accessory that will accept an input signal from a flow meter. When the flow varies, the sampler will draw more or less of a sample over a specific time frame. This is helpful when rain events or heavy flows occur. This is also useful in helping to determine where new contaminates, or heavy BOD loads are coming from. (i.e. a local industry with private treatment plants emptying into a municipal sewer.) |
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| Timed sampling can be thought of as an average based over a specific time frame. Regardless of the flow rate, a timed sample will draw a specific volume at a specific time daily, hourly etc. This is very useful in determining long term trends, chemical feed rates, BOD loadings at various times of year etc. |
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