Question

A Google cache search with baumer tw tb
http://www.baumerelectric.com/be40.html?L=1

Nominal sensing distance Tw

The nominal sensing distance, Tw, is the maximum sensing distance of the sensor, measured at +25б╟ centigrade, using a white card (Kodak card number 1,527,795, size 200 x 200 mm). At distances below 400 mm, the object size is 100 x 100 mm. The excess gain (factor 1,5) under ideal ******t conditions is included in this value. Sensors with the alignment aid show this point with a constant (not flashing) LED.

Actual sensing range Tb

The actual sensing range Tb is between the adjusted nominal sensing distance Tw and the blind region. The blind region is the area immediately before the lens, in which target recognition cannot be guaranteed. Within the actual sensing range, a standard Kodak white target will always be detected.
 

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