Asphalt – Bitumen
The Travelling Beam Device is used to check for any irregularities in both concrete and bituminous road surfaces. The Device is 3 meter long. A sensing unit comprising a wheel connected to an indicator provides a magniﬁcation of 4:1. Deviation of the surface from a straight-line on a scale calibrated in increments of 2 mm up to 10 mm and 5 mm up to 25 mm. A dye-marker is ﬁtted which may be used to identify suspect areas. Outrigger wheels provide mobility on site. The device is supplied as three
sub-assemblies which are quickly assembled on site. The Travelling Beam is supplied ﬁtted with an autographic recorder providing a permanent record of the surface proﬁle. Records up to 1 kilometre can be recorded on the special chart paper rolls used.