optris Bottom-Up GIS 450i G7, Operator'S Manual

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4.2 Glass breakage sensor CTL 4M
To protect the cameras, the glass inspection system is delivered with a glass breakage detection. For this
purpose, the pyrometer CTL 4M is set up just below the scan line between the rollers. If a glass breaks into
pieces and these fall between the rollers, the pyrometer recognizes this because of the ultra-fast reaction
time of 90 µs and gives the shutters a signal to close.
The shutters are operated here in the so-called fast mode , so that the closing time is approx. 100ms. This
prevents broken glass from damaging the camera lens. Furthermore, a signal can be output that a glass is
broken.