Metrohm 763 PVC Thermomat Manual User Manual
Page 57
4 Operation
763 PVC Thermomat
50
4.4.2
Determination of Delta T
The temperature correction Delta T describes the variation of the
actual sample temperature from the temperature in the heating block
and is a parameter of the method (see section 4.5.2). It can be auto-
matically determined with the 6.1111.010 Calibrated external tempera-
ture sensor (part of the 6.5616.000 GLP test set available from Metrohm
as an option). Since the direct temperature measurement in PVC sam-
ples is impossible, silicone oil must be used as sample instead of PVC.
Preparations
Fig. 5 shows in detail how to install the accessories for Delta T determi-
nation. Proceed as follows:
1 Prepare reaction vessel cover
•
Install gas inlet tube 35
35 (part of the 6.5616.000 GLP test set,
length = 148 mm) on the reaction vessel cover 22 (see section
2.2.2).
•
Fasten distance piece 37
37 to the gas inlet tube 35
35 so that it is
located at a distance of approx. 2 cm from the upper end of
the reaction vessel.
•
Fasten distance piece 37
37 to the gas inlet tube 35
35 so that it is
located at a distance of approx. 5 cm from the lower end of
the reaction vessel.
•
Insert temperature sensor 36
36 from above in opening 31
31 of the
reaction vessel cover 22 and fasten it in the corresponding
openings of the distance pieces 37
37.
2 Prepare reaction vessel
•
Fill reaction vessel 11 with 5 g silicone oil (e.g. FLUKA
85409).
•
Place the reaction vessel cover 22 with temperature sensor 36
36
on the reaction vessel 11.
•
Slide the temperature sensor 36
36 right down (the sensor must
touch the base of the vessel).
3 Insert and connect reaction vessel
•
Place the prepared reaction vessel 11 in channel 2 or 3 of the
heating block.
•
Attach one end of the brown connecting tubing 66 at connec-
tion nipple 30
30 on the reaction vessel cover 22.
•
Attach the other end of the brown connecting tubing 66 at the
connection 19
19 on the 763 PVC Thermomat (see Fig. 3).
4 Modify method parameters
•
In the control window select the required
Method
for the
heating block for which the temperature correction
Delta T
is
to be determined.