=New equipment management database, which initiates an alarm whenever the temperature exceeds a maximum specified level. If this procedure is carried out regularly it is soon possible to detect abnormal temperature rises in components before they have a chance to fail.

AGEMA Infrared Systems Ltd, Arden House, Leighton Buzzard, Beds. LU7 7DD, UK

Improved hole testing Available from Institut Dr F~rster is a system that speeds up and enhances hole testing procedures. The system comprises the hand-held probe HRo 860 T rotating at high speed with fixed axial feed and the Imaging options of the Defectoscop AF.

The H Ro 860 T scans the entire inner surface of each hole in a helical movement ensuring that no flaw is overlooked. The test time is also reduced to a minimum since each point is only scanned once. The image signals can be located by the associated test equipment via the synchronizing pulses generated by the HRo 860 T.

Image location is carried out by the C-Scan imaging option which displays all signals as a pseudo-3D image. A series of signals representing a flaw, such as a crack, can be easily identified. This makes it possible not only to pinpoint the circumferential and axial position of the defect, but also to identify its shape and magnitude. The resultant signal pattern is then automatically evaluated by the pattern recognition option: all signals exceeding a basic (noise) level are analysed to determine whether they make up a contiguous area. If the set defect threshold is also exceeded, they are classified as flaws and indicated on the subsequent defect pattern. The

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NO Type Hot Vet Wid Len Dir Amp

deg mm mm mm deg %

1 Hole 186 7.0 1.1 2.5 -24 18

2 Hole 186 14.5 1.2 3.0 -19 20

3 Hole 185 23.0 1.7 3.5 0 22

C-scan with analysis produced by the HRo 860 T hand-held probe from Institut Dr F6rster

defect pattern shows only the position and shape of the defects derived from the signals and does not include superfluous signals. The estimated defect positions and values calculated by the program are shown in a table of defects which can similarly be called up on the screen.

Institut Dr F6rster, GmbH & Co. KG, In Laisen 70, Postfach 1564, D- 7410 Reutlingen, Germany

Remote crawler range A new range of remotely controlled, multi-axis and multi-function crawlers has been developed by Sonomatic in contract with Nuclear Electric. MAVIS crawlers are suited to a variety of surface preparation and inspection tasks including corrosion

mapping, defect sizing and characterization.

The structured development of MAVIS resulted in a range of crawlers engineered for operation on the external surfaces of large-diameter pressure vessels within confined spaces. However, the crawlers can be used on any spherical, cylindrical or flat surface

High flux rare-earth magnets in conjunction with dc servo motors and tracked belts are used to provide omnidirectional steering and navigation of cylindrical, spherical and planar sections in any orientation.

The crawlers are of modular design, enabling a range of work and inspection heads to be fitted within the main body. These include wire-brush plate-conditioning heads with vacuum recovery, paint markers, CCTV cameras and lighting, ultrasonic and eddy-current transducers, navigation and positional feedback systems. They can be remotely controlled at distances up to 50 m from the workplace and within headroom limits of 165 mm from the inspection surface.

The models developed so far have been equipped to address the inspection needs of Nuclear Electric, and incorporate a complex control system and a comprehensive range of work heads. Derivatives can be readily custom designed to any specification.

Sonomatic Ltd, 20 Rivington Court, Hardwick Grange, Woolston, Warrington WA 1 4RT, UK

Compact ultrasonic sensor Claimed to be the smallest analogue output, self-contained cylindrical ultrasonic position sensor

NDT& E International October 1991 285