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Chlorine 0.01 - 6.0 mg/l with tablets (CLt)
GB
(a) free chlorine
CLt
Perform zero calibration (see "Operation").
0.0.0
Empty the vial and then add a DPD No. 1 tablet. Crush the tablet with a clean
stirring rod then add the water sample to the 10 ml mark. Mix well with the
stirring rod to dissolve the tablet. Screw the cap on and replace the vial in the
sample chamber making sure the ∆ and ∇ marks are aligned.
Zero
Press the ZERO/TEST key.
Test
The method symbol flashes for approx. 3 seconds.
CLt
The result is shown in the display in mg/l free chlorine.
RESULT
(b) total chlorine
Remove the vial and add one DPD No. 3 tablet to the coloured test solution. Mix to
dissolve with the stirring rod. Replace the cap and put the vial back into the sample
chamber, repositioning the ∆ and ∇ marks.
Wait for a colour reaction time of two minutes.
Zero
Press the ZERO/TEST key.
Test
The method symbol flashes for approx. 3 seconds.
CLt
The result is shown in the display in mg/l total chlorine.
RESULT
Rinse the vial and cap thoroughly after each test.
(c) combined chlorine
combined chlorine = total chlorine - free chlorine
Measuring tolerance:
0-1 mg/l: ± 0.05 mg/l
> 1-2 mg/l: ± 0.10 mg/l
> 2-3 mg/l: ± 0.20 mg/l
> 3-4 mg/l: ± 0.30 mg/l
> 4-6 mg/l: ± 0.40 mg/l
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