Metrohm 893 Professional Biodiesel Rancimat - Manual (Page 44)

5.2 Replacing the dust filter
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893 Professional Biodiesel Rancimat
5.2 Replacing the dust filter
The dust filter (2-15) is mounted on the opening marked with Filter on
the rear of the instrument and serves for filtration of the air aspirated
through the air pump. It must be checked at periodic intervals and
replaced in the case of more intense contamination (6.2724.010).
Figure 17 Dust filter - conditions
1 Dust filter new
New dust filters are white on the intake side. 2 Dust filter used
Used dust filters are discolored on the intake
side.
3 Dust filter full
Full dust filters have a dark to black color on
the intake side and must be exchanged.
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 humidity in the laboratory and also on the frequency
of use of the instrument.
The molecular sieve filled in the drying flask (2-9) serves to adsorb disrup-
tive oxidizing gases as well as of the water from the aspirated 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.