Hach DR/850, Procedures Manual, Page: 272 / 460

272
9.
Clean the outside of
the vial with a towel.
After the timer beeps,
place the blank into the
vial adapter. Tightly
cover the vial with the
instrument cap.
Note: Wipe with a damp
cloth and follow with a dry
one to remove fingerprints
and other marks.
10.
Press:
ZERO
The cursor will move to
the right, then the
display will show:
0 mg/L NH3-N
11.
Place the prepared
sample in the adapter.
Push straight down on
the top of the vial until it
seats solidly into the
adapter.
Note: Do not move the vial
from side to side as this can
cause errors.
12.
Tightly cover the
vial with the instrument
cap.
13.
Press:
READ
The cursor will move to
the right, then the result
in mg/L NH
3
-N will
be displayed.
Note: Standard Adjust may
be performed using a
prepared standard (see
Standard Adjust in Section 1).
NITROGEN, AMMONIA, High Range, Test 'N Tube,
continued