Metrohm 873 Biodiesel Rancimat Manual - Manual (Page 164)

5.3 Regenerating or replacing the molecular sieve ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
156 ￭￭￭￭￭￭￭￭ 873 Biodiesel Rancimat
5.3 Regenerating or replacing the molecular sieve
Note
Regenerate the molecular sieve regularly.
The intervals at which you have to regenerate the molecular sieve depends
on the air humidity in the laboratory and also on the frequency of
use of the instrument.
The molecular sieve filled in the drying flask (3- 11 ) serves for adsorption of
disruptive oxidizing gases as well as of the water from the sucked in air. You
can regenerate the molecular sieve in the drying oven at approx. +140…
+180 °C for 24 to 48 h. You can order a new molecular sieve under the
order number 6.2811.000.
Caution
Do not fill the hot molecular sieve directly into the drying flask after
regeneration, as otherwise the plastic filter on the filter tube will melt.
Wait until the molecular sieve has cooled down before filling.
5.4 Self test when switching on
An internal hardware self test executes after switching on the instrument.
Each one of the 7 test steps lasts around one second and is displayed on the
instrument number display (2-
5 ) by a combination sample of the 4 display
lamps. In the case of an error, the corresponding LEDs flash.
Display Cause Remedy
Device LED test. If not all LEDs
light up during this test,
an LED is defective. Notify Metrohm Service.
Device RAM test error. Switch the instrument off
and on again. If the error
occurs again, please
notify Metrohm Service.
Device PROM checksum test
error. Switch the instrument off
and on again. If the error
occurs again, please
notify Metrohm Service.