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GELNORM® – DE
Curing process measurement
The electrical measuring technique offers numerous advantages compared to the various mechanical methods. In contrast to the conventional rheological approach (based e.g. on rotationor shear viscosi-meters), the polymer sample is in no way and at no time subject to any kind of mechanical forces. Thus, any kind of mechanical distortion of the polymer structure during the curing can be excluded.
GELNORM - DE (Ref. 160.01) consists of a control unit which is based on a process controlled mea-suring system and a specially designed sensor DE.
By means of this sensor, an electrical conductivity function (with also a capacitive contribution) of the resin can be determined. As discussed abobe, the conductivity measurement correlates with the vis-cosity of the resin mixture.
A liquid crystal display is used to display all functions and parameters. All selections and inputs can be made by a menu-driven program.
All results remain stored. The Data can read out with a special program (Ref. 110.50). The data analy-sis can be done with MS-Excel.
Five different limiting values for the conductivity function can be preselected and thus individual processing times can be determined simply and without plotting the whole curing experiment.
A prerequisit for a high reproducibility of the experiments with GELNORM - DE is an optimum ther-mostatic control of the sample. The measurements can either be carried out at room temperature or using the Electric Heating Block DE (Ref. 160.60) designed for GELNORM - DE to provide the desired thermostatic control for temperatures up to 200°C. The temperature is regulated with the Control Unit TC-3 (Ref. 70.05).
Gelnorm® – DE Ref. 160.01
Temperature range From room temperature up to. 200 °C (heating block DE)
Operating voltage 230 V / 50 Hz or 115 V / 60 Hz ± 10 %
Interface RS-232, 9600 Baud D-Sub Stecker
Measuring sensor Special-Sensor DE Ref. 160.25 short (L = 55 mm)
Ref. 160.30 long (L = 330 mm)
Measuring principle Process controlled measurement signal
Program memory Eprom
Data summary Battery -RAM
Time/Date Actual time module