Hach DR/700 Procedures Manual page 699

PHOSPHORUS, REACTIVE
For water, wastewater and seawater
PhosVer 3 Method; Test 'N Tube
1.
Install module
81.01
in a DR/700
Note: Refer to
Calibration following
these steps.
Procedure
™
2.
Press:
I/O
The display will show
810 nm
and module
81.01
81-25
Method 8048
(0 to 5.00 mg/L)
3.
After 2 seconds,
the display will show
a program number,
the concentration
units and the zero
prompt. Press the
key until
PROGRAM
the lower display
shows program
number
81.000
The upper display
will show the S1
concentration.
Note: Clean glassware
with 1:1 hydrochloric
acid solution. Rinse
again with
demineralized water.
Do not use phosphate
detergents to clean
glassware.