Hach DR/850, Procedures Manual, Page: 133 / 460

133
Method 10102
CHLORINE, FREE
(0 to 5.00 mg/L) For water, wastewater, and seawater
DPD Test ‘N Tube
™
Method
*
Note: This product has not been evaluated to test for chlorine and chloramines in medical
applications in the United States.
* Adapted from Standard Methods for the Examination of Water and Wastewater
1.
Enter the stored
program number for Test
‘N Tube free
chlorine (Cl
2
).
Press:
PRGM
The display will show:
PRGM ?
Note: For most accurate
results, perform a Reagent
Blank Correction using
deionized water (see
Section 1).
2.
Press:
10 ENTER
The display will show
mg/L, Cl2 and the
ZERO icon .
3.
Insert the COD/TNT
Adapter into the cell
holder by rotating the
adapter until it drops
into place. Then push
down fully to insert it.
Note: For increased
performance, a diffuser
band covers the light path
holes on the adapter. Do
not remove the diffuser
band.
4.
Fill an empty Test ‘N
Tube vial with sample
(the blank).
Note: Fill to the top of the
Hach logo “oval” mark.
Note: Samples must be
analyzed immediately and
cannot be preserved for
later analysis.