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INSTRUMENTS
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Portable test kits based on the Palintest Pooltest 25 Photometer are available in a
variety of formats including the Palintest Pooltest 25 MiniLab which contains the
equipment and reagents for pool testing in a moulded plastic work-tray. These kits are
supplied complete with reagents, or without reagents, for use with Palintest reagent
starter packs. The latter format enables the user to select the tests specifically needed.
For a full list of reagents available see Palintest literature and price lists.
USING THE POOLTEST 25 PROFESSIONAL PLUS KITS
BASIC PRINCIPLES
Tests are carried out on the pool water by adding the appropriate reagent tablet or
tablets to a test tube containing a sample of the water. A distinctive test colour is formed
and this is indicative of the concentration of the parameter being tested.
The Pooltest 25 Photometer is used to measure the colour formed in the test. Light is
passed through the sample, then through an optical filter onto a photodetector. The test
program selects different filters depending on the colour of the test solution.
When a measurement is being carried out, a 'BLANK' tube is first inserted into the
photometer. It is important to understand the meaning of the term 'BLANK' tube.
The 'BLANK' tube is a test tube containing pool water only. This tube is used to
compensate for any inherent colour in the pool water and automatically sets the instrument
for each test.
Once the photometer has been set, the 'SAMPLE' tube is then inserted into the
instrument. The 'SAMPLE' tube is the test tube containing the coloured test solution
prepared by adding the reagent tablets to the pool water sample in accordance with the
test instructions. After the sample tube has been inserted, the photometer will display
the test result in the form of a digital readout.
Different tests are carried out on the photometer by selecting the appropriate program or
Test number. When used in conjunction with a computer system the test numbers can be
selected automatically by the computer. The test instructions describe precisely how each
of the tests should be carried out. Some of the instructions will indicate that the sample
should be prepared in a certain way, or that the tablets should be added in a certain manner.
It is important to observe these instructions in order to obtain accurate results.
Note that certain of the tests are based on turbidity methods. In these tests the
photometer is used to measure the degree of cloudiness which forms in the test solution.
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