Metrohm 873 Biodiesel Rancimat Manual - Manual (Page 85)

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873 Biodiesel Rancimat ￭￭￭￭￭￭￭￭ 77
4 Weigh in the sample
Note
Use new reaction vessels and air tubes for each measurement.
Blow the reaction vessels out with nitrogen before use so that any
particles adhering are removed.
￭ Weigh in 7.5 g of the samples in each of the reaction vessels.
5 Mount the accessories
￭ Take the upper edge of the reaction vessel in your hand (e.g. in the
gap between your thumb and index finger) and turn the glass round
once.
This serves for covering the degreased glasses with a light fat
film so that the vessel covers can be removed more easily after the
determination.
￭ Insert an air tube (5- 5 ) in the connector (5- 7 ) of the reaction vessel
cover, fix it with the O-ring (5- 6 ) and fasten it by screwing in the
thread adapter M8 / M6 (5- 3 ).
￭ Place the reaction vessel cover on the reaction vessel. Turn the cover
in such a way that the air tube is as close as possible to the vessel
wall.
￭ Connect the Iso-Versinic ® tubing to the tubing connector (5- 4 ) of
the reaction vessel cover.
￭ Place the prepared reaction vessel in the vessel holder.
4.6.2 Preparing the determination
1 Select method
￭ Under Unit x Block A, click on the symbol in order to select the
method for Block A.
￭ If required, also select a method for Block B.