Hach DR/2010 - Testing with Programmed Methods; Spectrophotometric Setup for Hach Programs

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3.3 Testing With Programmed Methods
The DR/2010 Spectrophotometer Procedures Manual provides illustrated,
step-by-step procedures for performing all the factory-entered methods.
This instrument manual has supplemental information on how the
instrument performs the necessary functions, and how to use the special
operating features. Once you are familiar with the basic operation of the
instrument, the instructions in the procedure manual are sufficient to
analyze your samples.
To add your own programs, we recommend placing a copy of the User-
Entered Calibration Worksheet into the procedure manual to provide a
single-source for all the instrument's test capabilities.
Table 6 illustrates a typical factory-programmed test run in the momentary
mode. A more detailed discussion of Table 6 items follows the table.
Colorimetric testing with preprogrammed calibrations has four general
phases: spectrophotometer setup, sample preparation, zeroing the
instrument and measuring the prepared sample. In the following
paragraphs, the scope of each phase is described in detail.
3.3.1 Spectrophotometric Setup for Hach Programs
Spectrophotometer setup using a Hach program is limited to selecting the
program number, the wavelength and the chemical form (i.e., P, PO
4
3-
,
P
2
O
5
). Selection of a chemical form is not always an option. The lid label
and each procedure will tell you which programs have alternate forms.
Table 6 Typical Hach Procedure
Step Action/Keystroke Display
1. Turn power on.
Self Test V.xx
then
Enter Program #
2. Select a Stored Program (for
example, program 225).
P 225 Dial nm to 522
3. Set Wavelength; The wavelength
number will flash until the correct
setting is chosen.
P225 Zero Sample
then
P225 mg/L Mg-CaCO
3
4. Insert blank and press ZERO.
Zeroing.....
then
0.00 mg/L Mg-CaCO
3
5. Place the prepared sample into the
cell holder. Press
READ.
Reading. . . .
then
1.00 mg/L Mg-CaCO
3