Chlorine With Tablet - Lovibond MiniDirect Mode D'emploi

Methods
GB
0.0.0
Zero
Test
CLt
RESULT
Zero
Test
CLt
RESULT
MiniDirect_ClpH_1 09/2008

Chlorine with Tablet

0.01 – 6.0 mg/l
a) free Chlorine
Fill a clean vial (24 mm Ø) with 10 ml of the water sample and
perform zero calibration (see "Operation") .
Remove the vial from the sample chamber and empty it, leaving a few
drops remaining in the vial .
Add one DPD No. 1 tablet straight from the foil and crush the tablet
using a clean stirring rod .
Add the water sample to the 10 ml mark . Close the vial tightly with the
cap and swirl gently several times until the tablet is dissolved .
Place the vial in the sample chamber making sure that the
are aligned .
Press the [ZERO/TEST] key .
The method symbol flashes for approx . 3 seconds .
The result is shown in the display in mg/l free Chlorine .
b) total Chlorine
Add one DPD No. 3 tablet straight from the foil to the same water
sample and crush the tablet using a clean stirring rod . Close the vial
tightly with the cap and swirl gently several times until the tablet is
dissolved .
Place the vial in the sample chamber making sure that the
are aligned .
Wait for a reaction period of 2 minutes.
Press the [ZERO/TEST] key .
The method symbol flashes for approx . 3 seconds .
The result is shown in the display in mg/l total Chlorine .
c) combined Chlorine
combined Chlorine = total Chlorine – free Chlorine
Tolerances:
0 – 1 mg/l: ± 0 .05 mg/l
> 1 – 2 mg/l: ± 0 . 1 0 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
Notes:
see page 24
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