Internal Angle Measurement Apparatus ILS


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.


  • Accurate calibration of internal angle of Gyratory compactors and verification of frame stability, to international Standards
  • Quick and accurate measurement of the internal gyratory angle: less than 30 minutes
  • No hot mix required: when, placed into the mould, the device reproduces the internal shearing forces generated by the hot mix during compaction
  • Ideal for periodic verification of the internal gyratory angle
  • Compatible with any make of Gyratory compactors
  • Battery operated


  ASTM D7115‰EN 12697-31 Annex B‰AASHTO T344

Technische specificaties

Technical Specifications

  • Battery operated
  • Reproducibility is in 0.01° Class, fitting to all Standards
  • Overall dimensions: 150 mm dia., 115 mm high
  • Weight approx.: 5.6 kg

Order nummers


ILS device for internal angle measurement for Gyratory compactors, conforming to EN 12697-31, annex B. Complete with Excel Macro and PC connection cable


Accessoires & toebehoren


78-PV0255/1: Calibrator blocks for ILS, set of two different angles, supplied with factory certificate