23
SECTION 3, continued
instrument, the instructions in the procedure manual should be
sufficient to analyze your samples.
Colorimetric testing with preprogrammed calibrations can be
divided into four general phases:
1. Colorimeter setup
2. Sample preparation
3. Zeroing the instrument
4. Measuring the prepared sample
The following sections describe each phase in detail.
3.2.1 Colorimeter Setup for Sample Analysis
The colorimeter setup using a Hach program begins by selecting
the desired program number. Programs numbers can be found in
the individual procedure. (See the DR/800 Series Procedures
manual supplied with your instrument.) Prompting icons will
appear to indicate which keys are acceptable for the user to select.
After turning the instrument on, the main display shows
information from the last program used before the instrument was
turned off.
If a different program is desired, press the
PRGM key and enter
the desired program number with the numeric keypad. The
instrument will recall that program.
If the number selected is not valid, an error signal sounds and the
display momentarily flashes an error icon. The display returns to
the prompt for the program number. Re-enter the correct program
number. Only select chemistries are available on the DR/820 and
DR/850. See APPENDIX A AVAILABLE PARAMETERS AND
RANGES on page 65.
When the program number has been successfully entered, the
display immediately prompts the user to zero the instrument by
illuminating the
ZERO action icon.
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