2
Chlorine (free) / 56I700200
Chlorine (free)
1 - 300 mg/L Cl
2
56I700200
Material
Reagents
Chlorine Free Buffer FCL1
Chlorine Free LR Titrant FCL2
Chlorine Free HR Titrant FCL3
The following accessories are required.
Accessories
Syringe, plastic, 20 mL
Titration jar with cap, plastic, 60 mL
Packaging Unit Part Number
65 mL 56L015165
65 mL
65 mL
56L015265
56L015365
Packaging Unit
1 pc.
1 pc.
Part Number
56A006501
56A006701
Application List
• Cooling Water
• Disinfection Control
Notes
1. Colours may vary depending on sample and test conditions.
2. Test should be carried out immediately on fresh samples.
3. If adding chlorine in an intermittent dose, wait 10-15 minutes after dosing before sampling and testing.
4. This wait is not necessary for continuously dosed systems.
5. Add 10 drops of Chlorine Free Buffer FCL1 if you are testing samples with a hardness greater than 400 mg/L (as CaCO
3
).
6. Dilute samples of less than 20 mL to approximately 20 mL with distilled or deionised water.
EN Method Reference Book 1.0
Chlorine (free) / 56I700200
Sampling
Select the sample volume from the table according to the expected measuring range and read off the factor to calculate the result.
Expected Range
1-4 mg/L
2-8 mg/L
5-15 mg/L
10-30 mg/L
15-40 mg/L
25-80 mg/L
50-150 mg/L
100-300+ mg/L
Titrant used
Chlorine Free LR
Titrant FCL2
Chlorine Free LR
Titrant FCL2
Chlorine Free LR
Titrant FCL2
Chlorine Free LR
Titrant FCL2
Chlorine Free HR
Titrant FCL3
Chlorine Free HR
Titrant FCL3
Chlorine Free HR
Titrant FCL3
Chlorine Free HR
Titrant FCL3
Sample Size
40 mL
20 mL
10 mL 6
5 mL 6
40 mL
20 mL
10 mL 6
5 mL 6
Factor
0.25
0.50
1.0
2.0
2.5
5
10
20
EN Method Reference Book 1.0
3
4
Chlorine (free) / 56I700200
6
Attention!
Select the appropriate sample volume according to the instructions in the chapter
Sampling.
Add 6 drops Free Chlorine Buffer FCL1 . Note:
Add 10 drops when hardness of sample is greater than 400 mg/l (as CaCO
3
).
Attention!
Record the number of drops that will be added.
Note: Make sure to swirl the jar after adding each drop!
Add Chlorine Free LR
Titrant FCL2 or Chlorine
Free HR Titrant FCL3 drop by drop to the sample until colouration turns from colourless/pale yellow to blue .
Calculate test result: Free Chlorine (as Cl
2 table)
) mg/L = Number of drops x factor (see
EN Method Reference Book 1.0
