Hach DR/850 - Page 407

407
Using AccuVac Ampuls
1. A User-Entered
Calibration is necessary
to obtain the most
accurate results. See
User Calibration Section
at the back of this
procedure. Program 92
can be used for process
control or applications
where a high degree of
accuracy is not needed.
2. Enter the stored
program number
for sulfate (SO
4
-
)-
AccuVac Ampuls.
Press:
PRGM
The display will show:
PRGM ?
3. Press: 92 ENTER
The display will show
mg/L, SO4 and the
ZERO icon.
4. Fill a sample cell with
at least 10 mL of sample
(the blank). Collect at
least 40 mL of sample in a
50-mL beaker.
Note: Filter highly turbid
or colored samples. Use
filtered sample in this
step and as the blank.
5. Fill a SulfaVer 4
Sulfate AccuVac Ampul
with sample.
Note: Keep tip
immersed until the ampul
fills completely.
6. Quickly invert the
ampul several times to
mix. Wipe off any liquid
or fingerprints.
Note: A white turbidity will
develop if sulfate is present.
Note: Accuracy is not
affected by undissolved
powder.
7. Press:
TIMER ENTER
A 5-minute reaction
period will begin.
Note: Allow the ampul to
stand undisturbed.
8. After the timer
beeps, place the blank
into the cell holder.
Tightly cover the sample
cell with the instrument
cap.
Choose Desired
Program Accuracy
SULFATE, continued