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The SD02 dual-wheel speed sensor relies on its own weight to allow the friction wheel to rotate with the conveyor belt without slippage. The optical grating disc and photoelectric conversion circuit connected coaxially with the friction wheel convert the belt speed into a voltage pulse output.
The SD01 single-wheel speed sensor relies on its own weight to allow the friction wheel to rotate without slipping with the conveyor belt. The grating disc and photoelectric conversion circuit connected coaxially with the friction wheel convert the belt speed into voltage pulses.