Hach DR/850, Procedures Manual, Page: 394 / 460

394
9.
The display will
show:
2:00 TIMER 3
Press:
ENTER
A 2-minute reaction
period will begin.
Note: A blue color will
develop if silica is present.
10.
After the timer
beeps, place the blank
(solution without Amino
Acid F Reagent) into the
cell holder. Tightly
cover the sample cell
with the
instrument cap.
11.
Press:
ZERO
The cursor will move to
the right, then the
display will show:
0.00 mg/L SiO2
12.
Place the sample
into the cell holder.
Tightly cover the sample
cell with the instrument
cap.
13.
Press:
READ
The cursor will move to
the right, then the result
in mg/L SiO2 will
be displayed.
Note: Use of the Standard
Adjust feature with each new
lot of reagent is highly
recommended. See Accuracy
Check.
SILICA, Low Range,
continued