Hach DR/850 Procedures Manual page 394

Colorimeter
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SILICA, Low Range,
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.
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.
continued
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
394
12.
Place the sample
into the cell holder.
Tightly cover the sample
cell with the instrument
cap.

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