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14
3 TEST METHODS
To Select the Test
Each test is identified by a separate program number or shortcut key. Program
numbers are shown in test instruction sheets supplied with the instrument.
These follow on tests have their own program number for reference purposes
although direct access to these programs is restricted.
We strongly recommend that before attempting to do any tests, ensure you
read ‘Blanks and Samples’ and the ‘Care and Maintenance’ sections in Section 2.
Test 1 FREE CHLORINE
Option 1: Range 0 - 5.00 mg/l (ppm)
Method: DPD
Colourless - Red
1 Rinse test tube with sample leaving a few drops in the tube.
2 Crush the DPD No 1 tablet in two or three drops of the water sample until
the tablet is thoroughly crushed.
3 Add the 10ml test solution, mix and seal the tube with the cap.
4 Gently invert the tube to remove any bubbles from the inner walls of the
tube.
5 Take photometer reading.
6 Retain test solution if Total Chlorine test required (see overleaf for further
instructions).
Reagents: DPD No 1 Reorder Code: AP 011
Test 1 FREE CHLORINE (XF)
Option 2: Range 0 - 10.0 mg/l (ppm)
Method: DPD XF Colourless - Red
1 Rinse test tube with sample leaving a few drops in the tube.
2 Crush the DPD XF tablet in two or three drops of the water sample until the
tablet is thoroughly crushed.
3 Add the 10ml test solution, mix and seal the tube with the cap.
4 Gently invert the tube to remove any bubbles from the inner walls of the
tube.
5 Take photometer reading.
6 Retain test solution if Total Chlorine test required (see overleaf for further
instructions).
Reagents: DPD XF Re-Order Code: AP 013