30
SECTION 3, continued
3.6 Quality Assurance
Verify the performance of your instrument in seconds using Hach
DR/Check™ ABS Secondary Standards (Cat. No. 27639-00).
These gel standards provide a measure of instrument absorbance
for use anywhere, anytime, as often as laboratory quality
assurance procedures suggest. The kit includes a blank and one
standard each of a low-, mid-, and high range absorbance value
from 0 to 2 ABS, for use with any DR/800 Series Colorimeter.
Table 3
Step Action/Keystroke Display
1. Turn power on. Press the EXIT/I/O
key. The instrument defaults to and
displays the initial screen of the
last program used.
EXAMPLE: If program 20 was the
last program in use, the
instrument will automatically recall
program 20.
2. Select the Program
number to be used.
Press the PGRM key, then enter
the program number and press
the ENTER
key.
After the PGRM key is pressed, a
blinking cursor appears with a
question mark. Enter the desired
program number. Press ENTER to
confirm this action and recall the
desired program number.
3. As needed, set, then start
the TIMER.
Press the TIMER key. In a Hach-
stored program, the timer
automatically defaults to the
appropriate reaction time.
Press ENTER to start the timer.
The entered or programmed
reaction time will display and
count down to zero.
4. ZERO the instrument using
the sample blank.
Insert blank and press ZERO
. After the ZERO key is pressed,
the instrument zeros on the
sample cell.
5. Obtain reading in
concentration, absorbance,
or % transmittance.
Place the prepared sample into
the cell holder. Press READ.
The instrument reads the sample
and displays the results.
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