eXact Micro 20 Instruction Manual page 15

eXact Strip Micro test procedure (SPECIAL NOTES)
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Total Hardness, HR & LR— Positive interferences are observed if the test sample contains Barium.
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Interferences also observed if the test sample contains Copper, Lead, Cobalt, or Nickel. The pH of the
sample for Total Hardness High Range should be between 6.9 and 7.2. If the pH not in this range,
the water sample pH has to adjust to pH 7 before doing the test.
Calcium Hardness — This test is accurate in water with Chloride < 2,000 ppm as NaCl. Chloride
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levels from 12,000 to 24,000 ppm as NaCl give 10-15% error. For samples with Chloride levels greater
than 25,000 ppm as NaCl, contact ITS for a look-up table.
Chloride — If sample pH is high (>9), adjust pH to 5–6 using Vinegar.
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Chromium — The strip needs to be angled in order to fit in the CELL because it is too wide.
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High Range Chlorine — Use a 10 second dip time if water temperature is above 40°C (113°F).
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INTERFERENCES: Oxidizers such as Chloramine, Chlorine Dioxide, Bromine, Iodine, Ozone,
Bromamines, and Permanganate will give false positive readings.
Nitrate — A. Use this procedure if NaCl is less than 400 ppm. Otherwise, use Nitrate (Salt Water)
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Procedure on page 26. B. The CELL needs to be cleaned with brush and distilled water after each test.
If any zinc dust is adhering to the CELL wall, it will affect results.
Phosphate — A. Clean CELL with 0.1N HCl, Distilled Vinegar (5%), or Muriatic Acid before filling the
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meter with the sample to be tested. B. If running multiple tests in a row, using the same water sample,
the CELL does not have to be rinsed or cleaned with acid between each test. It is recommended that
the CELL be rinsed three times with the sample water. C. The calibration of the meter is based on a
water temperature between 15°C (59°F) and 31°C (88°F). If temperature is below 15°C (59°F), your final
Phosphate value may read low. This test can also be used for salt water testing.
Total Alkalinity — For water temperatures above 35°C (95°F, hot tubs), remove and discard the strip
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when the timer displays "10", countdown continues.
The eXact Micro 20 Dual Wavelength Advanced Photometer System is designed
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for use with the eXact
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Dual Wavelength Photometer is manufactured and tested in an ISO 9001 Facility.
Strip Micro reagent delivery system. The eXact Micro 20
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