Chlorine With Tablet - Lovibond CheckitDirect Manual De Instrucciones

Methods
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Zero
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Zero
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RESULT
CheckitDirect_Cl-Br-pH-CyA-TA-CaH_2b 05/2011

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.
(Countdown can be activated, see page 27)
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: ± 0.10 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
Notes:
see page 28
marks
marks
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