Metrohm 763 PVC Thermomat Manual - Manual (Page 9)

1 Introduction
763 PVC Thermomat
2
1.2 Instrument description
The 763 PVC Thermomat is a PC-controlled instrument for determin-
ing the thermal stability of PVC and similar halogenated plastics and is
available in the following two versions:
• 2.763.0014 PVC Thermomat for 230 V, 50 … …60 Hz
• 2.763.0015 PVC Thermomat for 115 V, 50 … …60 Hz
The 763 PVC Thermomat is equipped with two heating blocks each
with 4 measuring positions. Each block can be individually heated, i.e.
2 sets of 4 samples can be measured at two different temperatures or 8
samples can be measured at the same temperature. Measurements at
the individual measuring positions can be started individually.
The complete operation of the 763 PVC Thermomat is carried out via a
PC connected to the RS232 interface with the aid of the «763 PVC
Thermomat» control and evaluation program. Up to 4 instruments can
be connected to 1 PC allowing a maximum of 32 samples to be ana-
lyzed at the same time. The evaluation algorithm of the PC program
determines the point of inflection of the Thermomat curve and therefore
the induction time fully automatically. Apart from the induction time,
the so-called stability time, i.e. the time taken until a certain alteration
in the conductivity is reached, can also be determined. The results ob-
tained can be subjected to further mathematical processes. In particu-
lar, induction times can be converted to the standard temperatures
contained in the relevant standards.
Each Thermomat curve can also be evaluated manually. A PC-suppor-
ted tangent method is available for this in which the tangents can be
applied to the curve as required. This means that evaluations are pos-
sible even in extreme cases.
The results of the determinations are stored in a database together
with all the data concerning the method and determination. In the re-
sults display part of the program determinations can be searched for,
sorted, filtered, exported and printed out. Apart from the graphical dis-
play of single and multiple curves it is also possible to carry out recal-
culations with altered parameters and to extrapolate the results to a
particular temperature.
GLP (Good Laboratory Practice) and instrument validation are continu-
ously increasing in importance. In the 763 PVC Thermomat GLP tests
are provided for the measurement of temperature, conductivity and gas
flow. They determine whether and which tests are to be carried out. The
time interval between the tests and the required accuracy can also be
laid down as required. If the GLP function is selected then on each re-
sult report a remark will be made as to whether the GLP test require-
ments have been fulfilled. As an option Metrohm offers a GLP test set
(6.5616.000), with which the most important tests can be carried out.