Aqualytic CHECKIT Comparator Instruction Manual page 5

Instructions for the determination of ozone in
the presence of chlorine
CHECKIT Disc
®
Ozone (DPD)
Accuracy:
Tablets
DPD No. 4
DPD Glycine
Ozone in the presence of chlorine (DPD No. 4 /
DPD Glycine-tablet)
 Fill both cells to the 10 ml mark.
 Add a DPD Glycine-tablet to one of the cells.
Crush the tablet.
 Afterwards add a DPD No. 4 -tablet to each cell.
Crush the tablets, close the cells with a lid. Swirl until
the tablets have dissolved.
 Place the cell with the DPD Glycine tablet and the
DPD No. 4 -tablet in the left-hand compartment of the
comparator. Place the cell which contains only the
DPD No.4 -tablet in the right compartement of the
comperator.
 Match the two colour fields against north day light and read
off the result as mg/l O
Measurement Range Order Code
0 - 1,0 mg/l O
3
± 5 % full scale
Order Code (per 100 pcs)
.
3
14 62 70
51 12 20 BT
51 21 70
1
2
3
4
5 5