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Scratches, fingerprints and water droplets on the tube can cause stray light interference leading
to inaccurate results. Tubes that have been scratched in the light zone through excessive use
should be discarded and replaced with new ones.
Tubes should always be washed on the inside and outside with mild detergent prior to use to
remove dirt or fingerprints. The tubes should be allowed to air-dry in an inverted position to
prevent dust from entering the tubes. Dry tubes should be stored with the caps on to prevent
contamination.
After a tube has been filled and capped, it should be held by the cap and the outside surface
should be wiped with a clean, lint-free absorbent cloth until it is dry and smudge-free. Handling
the tube only by the cap will avoid problems from fingerprints. Always set the clean tube aside
on a clean surface that will not contaminate the tube. It is imperative that the tubes and light
chamber be clean and dry. The outside of the tubes should be dried with a clean, lint-free cloth or
disposable wipe before they are placed in the meter chamber.
Tubes should be emptied and cleaned as soon as possible after reading a sample to prevent
deposition of particulates on the inside of the tubes.
Variability in the geometry of the glassware and technique is the predominate cause of variability
in results. Slight variations in wall thickness and the diameter of the tubes may lead to slight
variations in the test results. To eliminate this error the tubes should be placed in the chamber
with the same orientation each time.
Chambers which have been scratched through excessive use should be discarded and replaced
with a new one.
„ SAMPLE DILUTION TECHNIQUES
If a test result is out of the range of the meter, it must be diluted. The test should then be
repeated on the diluted sample. The following table gives quick reference guidelines for dilutions
of various proportions.
Amount of Sample
10 mL
5 mL
2.5 mL
1 mL
0.5 mL
All dilutions are based on a final volume of 10 mL, so several dilutions will require small volumes
of the water sample. Graduated pipets should be used for all dilutions. If volumetric glassware is
not available, dilutions can be made with the colorimeter tube. Fill the tube to the 10 mL line with
the sample and then transfer it to another container. Add 10 mL volumes of deionized water to
the container and mix. Transfer 10 mL of the diluted sample to the colorimeter tube and follow
the test procedure. Repeat the dilution and testing procedures until the result falls within the
range of the calibration. Multiply the test result by the dilution factor. For example, if 10 mL of the
sample water is diluted with three 10 mL volumes of deionized water, the dilution factor is four.
The test result of the diluted sample should be multiplied by four.
GENERAL INFORMATION
„ PACKAGING AND DELIVERY
Experienced packaging personnel at LaMotte Company assure adequate protection against
normal hazards encountered in transportation of shipments.
After the product leaves LaMotte Company, all responsibility for safe delivery is assured by the
transportation company. Damage claims must be filed immediately with the transportation
company to receive compensation for damaged goods.
„ GENERAL PRECAUTIONS
READ THE INSTRUCTION MANUAL BEFORE ATTEMPTING TO SET UP OR OPERATE THE METER.
Failure to do so could result in personal injury or damage to the meter. The meter should not be
used or stored in a wet or corrosive environment. Care should be taken to prevent water from wet
tubes from entering the meter chamber.
NEVER PUT WET TUBES IN THE METER.
„ SAFETY PRECAUTIONS
Read the labels on all LaMotte reagent containers prior to use. Some containers include
precautionary notices and first aid information. Certain reagents are considered hazardous
Deionized Water to Bring Final Volume to 10 mL
0 mL
5 mL
7.5 mL
9 mL
9.5 mL
17
Multiplication Factor
1
2
4
10
20
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