Oxygen, Dissolved, High Range Hrdo Method - Hach DR/850 Procedures Manual

OXYGEN, DISSOLVED, High Range
HRDO Method
1.
Enter the stored
program number
for dissolved oxygen,
high range.
Press:
PRGM
The display will show:
PRGM ?
:30
5.
Without inverting the
ampul, immediately
place the ampul cap that
has been filled with
sample securely over the
tip of the ampul. Shake
for about
30 seconds.
Note: Accuracy is not
affected by
undissolved powder.
Note: The cap prevents
contamination with
atmospheric oxygen.
2.
Press:
70 ENTER
The display will show
mg/L, O2 and the
ZERO icon.
6.
Press:
TIMER ENTER
A 2-minute reaction
period will begin.
Note: The two-minute
period allows oxygen
which was degassed during
aspiration to redissolve in
the sample and react.
(0 to 15.0 mg/L O
3.
Fill a sample cell
(the blank) with at least
10 mL of sample. Fill a
blue ampul cap with
sample. Collect at least
40 mL of sample in a
50-mL beaker.
:30
7.
When the timer
beeps, shake the ampul
for 30 seconds.
325
Method 8166
)
2
For water and wastewater
4.
Fill a High Range
Dissolved Oxygen
AccuVac Ampul
with sample.
Note: Keep the tip
immersed while the ampul
fills completely.
8.
Place the blank into
the cell holder. Tightly
cover the sample cell
with the instrument cap.