Hach DR/700 - Page 230

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SULFATE, continued
7. Fill a SulfaVer 4
Sulfate AccuVac
Ampul with
displayed standard.
Fill a second
AccuVac Ampul with
sample.
Note: Keep tip
immersed while the
ampul fills completely.
8. Quickly invert the
sample several time
to mix. Wipe off any
liquid or fingerprints.
Note: A white turbidity
will form if sulfate is
present.
Note: Accuracy is not
affected by undissolved
powder.
9. Wait 5 minutes.
Note: Allow the ampul
to stand undisturbed.
Note: Complete Steps
10-14 within 5 minutes
after the 5-minute
waiting period.
10. Insert the
AccuVac Vial
Adapter into the cell
holder.
11. Place the
AccuVac containing
the prepared standard
into the cell holder.
Note: In bright sunlight
it may be necessary to
close the cell
compartment cover.
Note: If the display is
blank, repeat Steps 2
and 3.
12. Press: ZERO
The display will
count down to 0.
Then the display will
show the standard's
concentration and the
zero prompt will turn
off.
5 minutes