Hach-Lange DR1900 Basic User Manual - Manual (Page 12)

Select basic program options
When a program is selected, additional parameter options are available.
1. Push Options to access the option menu.
2. Select the applicable options.
Option Description
Start Timer Select a pre-set timer or set a manual timer to make sure that the steps of an analysis
are correctly timed (e.g., reaction times or wait times can be exactly specified). When the
timer is on, the timer icon is shown on the display. The instrument makes an audible
sound when the time is over. Pre-set timer—Push Start to start the timer. If a stored
program has more than one timed step, push Stop>Options>Select>Select to start the
next timer. Timer Manual—Enter the applicable time with the navigation keys and push
Done. Default = 03:00
Operator ID The operator ID tag associates readings with an individual operator. Refer to Use an
operator ID on page 14.
Sample ID The sample ID tag is used to associate readings with a particular sample or with a
location. Refer to
Use a sample ID on page 13.
%T/Abs/Conc Switch to % transmittance, absorbance or concentration readings. Transmittance
reading (%)—Reads the percent of the original light that passes through the sample and
reaches the detector. Absorbance readings—The light absorbed by the sample is read
in absorbance units. Concentration readings—The measured absorbance values are
converted into concentration values with the program-specific stored equation.
Advanced
Options Use the advanced options to specify more parameters. Refer to Select advanced
program options on page 12.
Back Go back to the previous menu.
Select advanced program options
Every program has various additional advanced options from which to select.
1. Push Options to access Options>Advanced Options.
2. Use the advanced options to specify more parameters.
Option Description
Chemical Form Select the alternate chemical form and the associated measuring range on some factory-
installed methods.
Reagent Blank The Reagent Blank correction can be used with some of the factory-installed methods.
Enter the result of a completed test using deionized water as the sample. The blank value
is subtracted from every result to correct for any background color due to reagents. Enter
the blank correction before the Standard Adjust option is used. Complete this correction
for each new lot of test reagents.
Standard
Adjust Change stored calibration. Complete a test on a known standard at a concentration near
the top of the test range. Use this function to adjust the result to align the standard
concentration.
Dilution Factor Enter a corrective dilution factor for specific characteristics. The entered number prompt
will be multiplied by the result for the adjustment. For example, if the sample has been
diluted by a factor of 2, set the dilution factor to on and enter 2.
Note: When a dilution is in effect, the dilution icon is shown on the display.
Standard
Additions Examine the reading accuracy. Refer to the method procedure for more information.
Edit Change and update an existing program.
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