Metrohm 743 Rancimat - Manual (Page 169)

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743 Rancimat ￭￭￭￭￭￭￭￭ 161
5.2 Replacing the dust filter
The dust filter (3-20) is mounted in the opening marked with Filter on
the rear of the instrument and serves for filtration of the air sucked in
through the air pump. It must be checked at periodic intervals and
replaced in the case of more intense contamination (order number:
6.2724.010).
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 fre-
quency 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.