Preserving Measurement Accuracy
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| Preserving Measurement Accuracy: High suspended solids, such as those found in a waste treatment plant, may collect in the bottom of the cell or coat the copper electrode ring. This condition can be reduced or eliminated by installing a "flushing wye strainer" in the sample line just before it reaches the FX-1000p. The strainer is particularly well suited for high suspended solids applications.. It has a built-in flushing port that can be plumed to a drain, or back to process. This type of flushing port can be left partially open to minimize cleaning intervals. The screened outlet of the strainer can then be plumbed to the sample flow cell. High calcium levels in the sample can sometimes precipitate out on the copper electrode ring. The calcium buildup can be cleaned off with muriatic acid which is available at most hardware stores. (Use all applicable safety procedures when using any strong acid.) Any buildup on the copper electrode ring, including calcium, can be removed by polishing. |
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Cleaning The Copper Electrode
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| Cleaning the Copper Electrode Always polish the copper electrode ring whenever the electrode is: 1. Exposed to the atmosphere for more than a week (oxide/tarnish buildup occurs on new or out of service systems). 2. Used for about 12 months of normal operation (electrode usually oxidizes/tarnishes enough during this period to degrade measurement performance). 3. Acquires a precipitate buildup due to sample characteristics such as high calcium. Do not use any commercial abrasive cleaning powders or liquid, as they contain chlorine and will leave a residual coating that will adversely affect system performance. If the copper electrode ring is excessively scratched or has an uneven surface, it should be replaced. |
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Preparing the Buffer Solution
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| Preparing the Buffer Solution Important - The FX-1000p Chlorine Analyzer is designed to use only 5% distilled, food grade white vinegar as a buffering agent. Using any other buffering agent may void warranty. White distilled vinegar can be purchased throughout the USA in any local food store. |
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Free Chlorine Measurement Use common 5% distilled, food grade white vinegar only. Once opened, vinegar can become contaminated with biological organisms, especially over time and when it is not kept cool. Protect the vinegar from all types of contamination by keeping it cool, approximately 50°F, and by ensuring the supplied cap remains on the bottle. When the vinegar is depleted, do not add new vinegar to the existing bottle. Always discard the old bottle and simply replace it with a new bottle. This prevents biological organisms from contaminating the new vinegar. |
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Total Chlorine Measurement When measuring residual total chlorine, mix potassium iodide (KI) crystals directly into a 5% distilled, food grade white vinegar bottle at the time of use. Mix only one batch of vinegar and potassium iodide at a time, never premix. Always use ACS reagent grade KI. |
| Refer to the table below to find the range in which your typical total chlorine process value resides. Add the listed amount of crystals to one gallon of white distilled vinegar. Thoroughly mix the crystals until they are completely dissolved in the vinegar. Once the potassium iodide crystals are mixed with white distilled vinegar, the potassium iodide has a limited life of 7 days per gallon. If using #13 tubing it is recommended that an Auxiliary KI pump be installed. Mix the potassium iodide crystals with distilled water, rather than the vinegar. This will extend the limited life of the buffer solution, as it will be pumped separate from the vinegar. |
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