81-37
PHOSPHORUS, TOTAL, continued
CALIBRATION PROCEDURE
1) If the DR/700 is on and in a pre-programmed method, proceed to
Step 3. If it is off, press the
I/O key. The upper display will show the
wavelength and the lower display will show the module installed and the
software version number. Verify that filter module 81.01 is installed.
2) After 2 seconds, the display will show a concentration format, a
program number and the ZERO prompt.
3) Press the
PROGRAM key to obtain program number 81.000. The
ZERO annunciator will flash.
4) Press the
CAL key. The S1 annunciator and the first digit on the left will
flash.
5) Press the
UP ARROW key to set the first digit to 0. When correct,
press the
RIGHT ARROW key to select the next digit. Repeat this
procedure until all four digits are set to 0.
6) Press the
RIGHT ARROW key until the decimal point flashes. Press
the
UP ARROW key to move the decimal point so the display reads
0.000 for PO
4
3-
.
7) Press the
RIGHT ARROW key. A units indicator will flash. Press
UP ARROW until mg/L is displayed.
8) Prepare a demineralized water blank in a sample vial. Cap the vial
and put it into the DR/700.
9) Press
ZERO. The display will count down and then show another
four-digit concentration value. The S2 annunciator will begin flashing.
10) Press the
RIGHT ARROW key. The left digit will begin flashing.
Press the arrow keys to edit the display to read 5.00 for PO
4
3-
.
11) Press
READ. The display will count down and then show a relative
absorbance near zero. This step enters the upper limit (S2) value. The
S2 annunciator will flash.
Note: The colorimeter will display measurements above the upper limit,
but the accuracy is questionable.
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