Metrohm 1.873.0014, Manual

Page: 60 / 192

4.4 Calibration functions
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52 ￭￭￭￭￭￭￭￭
873 Biodiesel Rancimat
Preparing Delta T determination
Figure 6 shows in detail how the accessories for determining Delta T are
mounted. Proceed as follows:
1 Prepare reaction vessel cover
￭
Mount the air tube on the reaction vessel cover (see "Mount the
reaction vessel cover", page 15) .
￭
Clamp the first spacer at a distance of approx. 12 cm from the lower
end onto the air tube.
￭
Clamp the second spacer at a distance of approx. 5 cm from the
lower end onto the air tube.
￭
Insert the temperature sensor from above into the temperature
sensor opening of the reaction vessel cover and fasten it in the cor-
responding openings of the spacers.
2 Prepare reaction vessel
￭
Fill the reaction vessel with 5 g silicone oil (e.g. FLUKA 85409).
￭
Place the reaction vessel cover with the temperature sensor on the
reaction vessel.
￭
Push the temperature sensor fully downwards (the sensor must be
on the vessel base).
3 Insert and connect reaction vessel
￭
Insert the reaction vessel with the mounted reaction vessel cover in
channel 2 or 3 of the required heating block.
￭
Screw the one end of the FEP tubing 250 mm onto the thread
adapter M8 / M6 of the reaction vessel cover.
￭
Screw the other end of the FEP tubing onto the corresponding con-
nector
(3-
3
) of the Biodiesel Rancimat.
4 Set method parameters
Note
Create a unique method for both blocks, so that you can separately
enter the temperature correction for both blocks.
￭
In the
Control window
, select the required
method
for the heat-
ing block for which the temperature correction Delta T is to be
determined
(see "Select method", page 77) .