Hach DR/850, Procedures Manual, Page: 364 / 460

364
5.
Clean the outside of
the vial with a towel.
Note: Wiping with a damp
towel, followed by a dry
one, will remove
fingerprints or other marks.
6.
Place the sample vial
into 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.
7.
Tightly cover the
sample vial with the
instrument cap.
8.
Press:
ZERO
The cursor will move to
the right, then the
display will show:
0.00 mg/L PO4
Note: For multiple
samples, zero only on the
first sample. Read the
remaining samples after
adding the PhosVer 3
Reagent.
9.
Using a funnel, add
the contents of one
PhosVer 3 Phosphate
Powder Pillow to the
vial.
10.
Cap the vial tightly
and shake for 10-15
seconds.
Note: The powder will not
completely dissolve.
11.
Press:
TIMER ENTER
A 2-minute reaction
time will begin.
Note: Read samples
between 2 and 8 minutes
after the addition of the
PhosVer 3 reagent.
Note: A blue color will
develop if phosphate is
present.
12.
Immediately after
the timer beeps, place
the sample vial 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.
PHOSPHORUS, REACTIVE,
continued