Pendulum hardness tester
Manufacturer: TQC Sheen
Availability: Order only
The pendulum paint hardness tester is available in one of three models:
- pendulum hardness tester according to the Persoz method
- pendulum hardness tester according to the König method
- combined hardness tester, which uses both König and Persosa pendulums
Both methods work on the principle that the damping time of a pendulum oscillating on a specimen indicates the hardness, according to the ISO 1522 standard.
The TQC Sheen pendulum hardness tester has a simple interface and is a modular system. The tool itself can be used for both the König method and the Persoz method.
König pendulum - rests on two tungsten carbide balls and is balanced (to adjust the natural vibration frequency) through a weight sliding along a vertical rod mounted on a crossbar. On a polished glass plate, the period of oscillation should be 1.40 ± 0.02 s, and the time for the decrease in the amplitude of oscillations of the pendulum when displaced from 6 ° to 3 ° should be 250 ± 10 s. The total mass of the pendulum should be 200 ± 0.2 g. The Koenig pendulum can slide on surfaces with a very low coefficient of friction.
The Persoz pendulum is also supported by two tungsten carbide balls, but without a counterweight. The period of oscillation on a polished glass plate should be 1 ± 0.001 s, and the time for decreasing the amplitude of oscillations when the pendulum deviates from 12 ° to 4 ° on the same surface should be 430 ± 10 s. The total mass of the pendulum should be 500 ± 0.1 g, its center of gravity at rest should be 60 ± 0.1 mm below the support plane, and the arrowhead should be 400 ± 0.2 mm below the support plane.
Both pendulums must be ordered separately. Once the correct pendulum has been installed, switching between the two measurement methods is done at the push of a button. The pendulum moves fully automatically with a stepper motor. Also, the release of the pendulum is automated using an electromagnetic system. The end of the test is signaled by a visual and audible signal.
|Specifications||SP0510 - Persoz Method||SP0505 - König Method|
|Swivel balls||2 tungsten carbide, 8 mm diameter||2 tungsten carbide, 5 mm diameter|
|50 mm||30 mm|
|Period of oscillation||1 sec||1.4 sec|
|Deflection angle||12 ° - 4 °||6 ° - 3 °|
|Counting method||Fluctuation = time||Fluctuations and time|
|The decay time (glass)||Minimum 430 +/- 15 sec||250 +/- 10 sec|
|Weight||500 gram||200 gram|
|Compliance with the standard||ISO 1522|