Orbeco AQUA Comparator Mode D'emploi page 3

Combined chlorine Instructions
Subtract the reading for free chlorine from the result obtained
for total chlorine to obtain combined chlorine.
Example:
minus : free chlorine
gives :
Note:
Levels of chlorine above 6 mg/L can cause bleaching of the
sample.
Important:
Place the cell with the mark (point) to the viewer in the com-
partment.
It is essential to rinse the cells thoroughly after each test.
To obtain maximum accuracy always view and match color
against north day light.
Store Color Disc in the dark.
total chlorine
combined chlorine
1.20 mg/L
0.42 mg/L
0.78 mg/L