5.8 Background Lightning and LCD-Contrast (LCD)
Light
The backlighting is turned off automatically 5 seconds after the last time a
key has been pressed (Auto off), or it is always off (Always off).
Contrast
Display contrast is adjustable to one of 9 levels with the keys.
5.9 Automatic Switch-off (Power)
Off
Automatic switch-off off. The instrument must be switched off manually.
On
The instrument switches off automatically if not operated for 10 minutes.
5.10 Software Version (Version No.)
The software version is displayed.
5.11 Date and Time (Date&Time)
The settings for date and time can be edited here. The date is displayed in
the format year/month/day (e.g. 2003/03/04 for March 4, 2003). Both
date and time are included in the data transfer to a printer or computer.
5.12 Identification
An identification consisting of 10 letters and numbers (instrument name,
user, etc.) may be entered here. This identification will be included in the
data transfer to a printer or computer.
6 Measurement (meas)
6.1 Procedure for proper measurement
Procedure for proper measurement
1 Test the instrument for accuracy with the accompanying density
standard or distilled water before beginning any measurements, see
[Test measurement}10].
2 Insufficient cleaning leads to remaining residue in the measuring cell
and, therefore, incorrect results. Ensure that the measuring cell is clean
before each measurement.
3 Check the sample for chemical resistance of the instrument materials.
Instrument materials
• Sample tube: PTFE (polytetrafluorethylene)
• Measuring cell: Borosilicate glass
• Measuring cell holder: PPS (polyphenylene sulphide)
• Sample pump: PP (polypropylene)
4 Ensure that the samples to be measured are liquid enough to be
sucked up or injected.
5 Ensure that the samples to be measured can be dissolved with a
solvent suitable for cleaning the measuring cell.
Densi-H 17Revision 2.0, February 5, 2016