A Practical Guide to Particle Counting for Drinking Water by John Michael Broadwell

By John Michael Broadwell

As EPA criteria for water caliber have tightened in recent times, the necessity to extra correctly verify filter out functionality and enhance the general therapy technique has ended in elevated call for for the excessive sensitivity supplied by means of particle counters. One particle counter can provide you extra info than a dozen turbidimeters-if you understand how to type in the course of the complexity and confusion.

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Make sure that all maintenance personnel are performing the same tasks, and doing so consistently. Brief guidelines for performing each operation should be listed, with a space for recording any measurements or observations. It may be a good idea to laminate copies of helpful diagrams from the particle counter operation and maintenance manual and keep them on the clipboard used for the checklist. Information from each checklist should be recorded in the maintenance log. It should also be given to the system operator to reference in the data files.

An overflow should always be present. If no overflow is visible, check the flow into the constanthead overflow weir. 2. Remove the inlet tubing from the particle counter. A steady stream of sample should be flowing out of this tubing, well in excess of the required flow for the particle counter. If this in not the case, the problem exists in the constant-head overflow weir. 3. In most cases the obstruction will occur in the flow cell of the particle counter. If a flowmeter is installed, it could be clogged.

3. Install the system without flowmeters, and determine how many, if any, problems with flow control are encountered. Have the flowmeters quoted separately and reserve the right to purchase them at a later time. 4. Place flowmeters only on the most troublesome units. There is no need to install them on every particle counter if only a few are causing problems. For example, filter effluents should be easy to maintain because there are few particles to clog the particle counter, and most headloss problems can be solved with the constant-head overflow weir.

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