26
SECTION 3, continued
will begin. The display will show the remaining time. At the end
of the elapsed time, the instrument sounds five beeps.
3.2.6.2 Stopping the Timer
Stop the timer at any point in the countdown by pressing the
ENTER key. If a pre-programmed timer was in use, the full timer
period will be displayed. Press the
ENTER key again to resume
count down. If a manual timer was in use, the display for entering
a new length of time will be shown, see Section 3.2.6.1 Using the
Timer in Manual Mode. Press
EXIT to leave the timer mode.
3.3 Reagent Blank Correction
The Reagent Blank Correction can be used with some of the
factory-entered methods. It subtracts the color absorbed when
running the test with deionized water instead of sample. The
blank value is subtracted from every result to correct for any
background color due to reagents.
When using the Reagent Blank Correction feature, the blank
correction should be entered before the Standard Adjust feature
is used.
To enter a programmed correction for the reagent blank:
1. Run the test using deionized water with each new lot
of reagents.
2. Press
READ to obtain the blank value; record the value for use
in step 4..
3. Press
SETUP, scroll to BLANK and press ENTER. The display
will show
BLANK?.
4. Enter the blank value obtained in step 2..
5. Press
ENTER to accept the value as the blank to be subtracted
from each reading.
6. The display will show 0.00 mg/L (resolution and units vary
with the method) and the sample cell icon will be displayed,
indicating that the reagent blank feature is enabled and the
blank value will be subtracted from each reading. Repeat the
reagent blank adjust for each new lot of reagents.
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