The importance of a precise gyratory angle has been widely noted. The measuerment of the internal angle represents, in practice, the most accurate method of calibration. This method comprises two individual values: angle between cylinder and top plate and angle between cylinder and bottom plate.
The average of these two values is taken as the "internal angle". To date the internal angle calibration of gyratory compactors has been considered a difficult task leading to wide variations in results even between machines of the same brand.
The ILS device fully satisfies the verifications requirements to measure the internal angle conforming to EN 12697-31 Annex B. It can also be used on any other makes of gyratory compactors.
The Internal angle measurement apparatus ILS can be used as part of your Superpave performance based testing program.