Hach DR/850 - Page 119

119
Using AccuVac Ampuls
1.
Enter the stored
program number for free
and total chlorine (Cl
2
)-
AccuVac Ampuls.
Press:
PRGM
The display will show:
PRGM ?
Note: For most accurate
results, perform a Reagent
Blank Correction using
deionized water (see
Section 1).
2. Press: 11 ENTER
The display will show
mg/L, Cl2 and the
ZERO icon.
3. 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: Samples must be
analyzed immediately and
cannot be preserved for
later analysis.
4. Place the blank into
the cell holder. Tightly
cover the sample cell
with the instrument cap.
5. Press: ZERO
The cursor will move to
the right, then the
display will show:
0.00 mg/L Cl2
Note: If Reagent Blank
Correction is on, the
display may flash “limit”.
See Section 1.
6. Fill a DPD
Free Chlorine Reagent
AccuVac Ampul
with sample.
Note: Keep the tip
immersed while the ampule
fills completely.
7. Quickly invert the
ampule several times to
mix. Wipe off any liquid
or fingerprints.
Note: A pink color will
form if chlorine is present.
8. Immediately place
the AccuVac Ampul into
the cell holder. Tightly
cover the ampule with
the instrument cap.
Note: Perform step 9
within one minute of
reagent addition.
CHLORINE, FREE continued