Type MD Light-curtain. The Type MD Light-curtain scanner was originally designed as a simple light curtain to provide a rough diameter measurement of logs. Since its inception it has morphed into a number of useful devices.West Fraser (Pacific Inland Resources) used a number of the MD sensors as a backlog scanner to control the flow of lumber from the unscrambler through to the lug loader. This was always a problem area both for production and safety of the workers.The new scanner has imp9458
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