8 Checks, Adjustments, Calibrations
20
E15IB001EN-N
Performing an adjustment
For the air/water adjustment, the adjustment media
are dry air and freshly degassed ultra-pure water.
DMA 1001:
The 1-point water adjustment simply
skips the air adjustment.
DMA 501 only:
All adjustments are valid for the
whole temperature range.
IMPORTANT:
You cannot use the peristaltic pump
Xsample 200 for adjustments.
1. Select
Adjustments
in the menu, then select
one of the available density adjustments.
2. Rinse and clean the measuring cell.
TIP:
If you use undenatured ethanol as the final
rinsing liquid, only 3–4 min drying time are required.
3. Tap
Start Air Pump
to dry the measuring cell.
4. Tap
DONE
.
5.
Air adjustment:
a. Enter the air humidity and the atmospheric
pressure.
The air humidity is set to 50 % per default.
The atmospheric pressure displayed is mea-
sured automatically by a built-in sensor.
TIP:
The atmospheric pressure that you get from a
local weather station is usually not the absolute
atmospheric pressure, but a calculated atmospheric
pressure value referenced to sea level.
b. Enter the adjustment temperature.
IMPORTANT:
We strongly recommend to adjust
the instrument at the temperature at which you will
perform your measurements (±5 °C/±9 °F).
c. Tap
START
.
The air adjustment routine is carried out.
6.
Water adjustment:
a. Fill freshly degassed ultra-pure water into
the measuring cell.
Take care to fill the water without air bubbles.
b. Tap
START
.
The water adjustment routine is carried out.
7. The results of the adjustment are shown.
Check the recommendation on the screen and
apply or reject the adjustment.
All results are also saved in the data memory.
Reset adjustments to factory adjustment
You can reset the instrument’s adjustments to the
factory adjustment:
1. Select
Adjustments
in the menu, then tap in
the action box.
2. Switch the adjustment to “Yes”.
3. Tap Reset.
Adjustments will be reset.
8.3 Calibrations
See the reference guide for information on calibra-
tions.
