Crater – Hole and Crack detector



Sheet metals are manufactured using continuous process to stretch the raw material and form a steel sheet metal of some tenth millimetres of thickness.
The stretching process of the sheet metal on continuous line can induce a lack of homogeneity of the metal structure and form cracks on border or tears on sheet.

These most critical defects can lead to sheet tearing, stop the production line or at worst cause injury.
In order to detect those defects and prevent accident before cold rolling or coating or annealing, we propose an automatic detector called CRATER composed of sensors of our current SIRRAH range associated to a special processor board.
SIRRAH angular sensors are tested and confirmed since now many years in harsh environment such as harbour or steel mills.

Our system is composed of 4 sensors on a special mechanical structure, 1 external processor board located into the electrical cubicle and 1 long infrared beacon under the running sheet with a length superior to its width.
A specific industrial computer treats in real time data received from the 4 sensors and assures necessary calculations to detect crack on border, sheet tearing and welding.

CRATER detector allows to detect at a run speed of 8m/sec cracks of a 10mm²-surface up to 10 cm², on metal sheets of thickness 0,15 mm up to 5 mm with variable width from 600 mm to 1450 mm.

Please refer to our sensor solution named "HOLE AND CRACK DETECTION" for the description of working principles.


- Detection of crack of a 10mm²-surface up to 10cm²

- Detection of hole up a 5mm-diameter
- Detection of hole up a 2mm-diameter by adding a fifth sensor

- Strip thickness from 0,15 mm to 5 mm
- Maximum run speed : 500m/min
- Width of sheet between 600 and 1450 mm
- Range of temperature of functioning from - 10°C to + 50°C for the detector
- Range of temperature of functioning from + 15°C to + 50°C for the cubicle 


Dimensions of the structure :
1600 x 1600 x 250 mm
Dimensions of the control panel :
400 x 500 mm

Electric data :
230VAC 50 Hz / maximal consumption 100W / 16A.

Control Panel

Interfaces :
Indications on defects are given by 6 mechanical output relays
* 2 relays for crack detection
CRATER InfraRed Beacon* 2 relays for hole detection
* 1 relay to detect variation of the sheet position
* 1 relay to indicate the good functioning of the system
Detection of change in sheet’s width
(welding detection)
Detection of position of edge sheet
(position detection)

InfraRed beacon


CRATER :  Hole and Crack detector 


CEPHEE : pin-hole detector
SIRIUS :  measure equipment of strip’s width
ORION :  painting defect detector 

Download Product Data Sheet

Réalisation SYSTONIC 2008