Hach-Lange DR1900 User Manual - Manual (Page 20)

1. Push SETTINGS>Setup>System Checks>Optical Checks>Absorbance Check.
2. Push Options> λ and enter the applicable wavelength.
3. Obey the screen prompts to complete the procedure.
4. Compare the result with the values for the test filter. When the results are not in the tolerance
range, contact the manufacturer.
Do a stray light check
The stray light check measures the stray light in the instrument at 340 nm.
1. Push SETTINGS>Setup>System Checks>Optical Checks>Stray Light Check.
2. Obey the screen prompts to complete the procedure.
3. Compare the result with the values for the test filter. When the results are not in the tolerance
range, contact the manufacturer.
Do an instrument verification
The verification kit is used for periodic monitoring of stray light, photometric accuracy and the
wavelength accuracy of the instrument. The verification kit is an optional test filter set which contains
six precision glass filters, target values and instructions. It is available as an aid to complete
comprehensive in-house instrument checks. Refer to
Replacement parts and accessories
on page 20.
1. Push SETTINGS>Setup>System Checks>Optical Checks>Verification Kit.
2. Select an option.
Option Description
Number Enter the verification kit number given in the quality control certificate and on the box.
Nominal Values Enter the values (filters, wavelength, nominal values and tolerances) given in the quality
control certificate for the stray light, the photometrical and the wavelength accuracy.
Verification Obey the screen prompts to complete the procedure.
Test Result Shows the last recorded test results.
Do an analytical quality assurance
The analytical quality assurance examines the individual working method with standard solutions or
the examination of cross-sensitivities of the analyses by standard addition solutions.
1. Select a specific program, then push Start.
2. Push SETTINGS>Setup>System Checks>AQA.
3. Select an option.
Option Description
AQA Standard Examine the working method, photometers and accessories with the standard solution
analysis.
AQA Addition Identify the faults and interferences in the sample with the addition solution analysis.
4. Select AQA Standard or AQA Addition.
5. Select Options>New to define a new standard.
6. Obey the screen prompts to complete the configuration.
7. Push Start to start the procedure.
Update the firmware
Refer to the module documentation for further information.
18 English