Hach-Lange DR1900 User Manual - Manual (Page 19)

Option Description
Display Style Select a high or a smooth contrast to suit lighting conditions. Default: High Contrast
Intelligent Menu When set to on, the instrument keeps the memory of a path to a specific menu which was
accessed the time before. Default: On
3. Push SETTINGS>Setup>Display & Sound>Sounds.
4. Select an option.
Option Description
Key Press The instrument will make an audible sound whenever a key is pushed. Default: off
Reading Complete The instrument will make an audible sound whenever a reading is complete. Default: on
Do a system check
The system check menu contains various performance tests.
1. Push SETTINGS>Setup>System Checks.
2. Select an option.
Option Description
Optical Checks The menu contains programs to examine the wavelength accuracy, absorbance accuracy
and repeatability, stray light and to operate the verification kit. Refer to
Optical checks
on page 17.
Service Time
Reminder To make sure that there is a regular instrument inspection, an automatic reminder for the
service times can be entered.
AQA The analytical quality assurance examines the analytical quality. Refer to Do an
analytical quality assurance on page 18.
λ-Check: Auto Select auto, next power on or always to automatically examine the wavelength (λ).
Auto–The system identifies if a motor relocation to a specific position at startup is
needed. Always–The motor is relocated to a specific position every time when the
instrument is set to on. Next power on–The motor is relocated to a specific position the
next time the instrument is set to on and then, the instrument changes back to auto
mode.
Factory Service The factory service menu needs a specific password for access. This menu is for
additional service tasks only.
Rescan 100% T When set to on, the instrument zero is set automatically when a LCK or TNTplus method
is selected. An "Air reading" key shows, so that zero can be pushed when necessary.
Default: Off
Optical checks
Do a wavelength check
The wavelength check measures the wavelength accuracy at 807 nm. Use a test filter (Neodym or
BG20/2) to complete this test.
1. Push SETTINGS>Setup>System Checks>Optical Checks>Wavelength 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 absorbance check
The absorbance check measures the photometric accuracy and repeatability of the instrument.
English 17