Hach DR/850, Procedures Manual, Page: 430 / 460

430
Colorimetric Reaction
1.
Enter the stored
program number
for toxicity.
Press:
PRGM
The display will show:
PRGM ?
2.
Press:
61 ENTER
The display will show:
ABS 610 nm
and the zero icon.
3.
Insert the TNT/COD
Adapter into the cell
holder by rotating the
adapter until it drops
into place. Then push
down to fully insert it.
Note: A diffuser band
covers the light path holes
on the adapter to give
increased performance.
The band should NOT be
removed.
4.
Fill a Test ‘N Tube
vial with deionized
water. Label this vial as
the “blank”. Wipe the
outside of all the vials
with a tissue to remove
fingerprints and
smudges.
5.
Place the blank in the
adapter. Tightly cover
the vial with the
instrument cap.
6.
Press:
ZERO
The cursor will move to
the right, then the
display will show:
0.000 ABS
7.
Label a vial
“control.” Open one
ToxTrak Reagent
Powder Pillow and add
the contents to the empty
reaction vial.
8.
Label each sample or
dilution vial clearly. Add
the contents of one
ToxTrak Reagent
Powder Pillow to each
labeled vial.
TOXTRAK TOXICITY TEST,
continued