42GTF-9000-QD - Allen-Bradley Sensors Photoelectric Timing 42GTF-9000-QD 42GTF-9000-QD is a Series 9000 Photoelectric Sensor from Allen-Bradley. Connection: 4-pin DC Micro (M12) QD. 42GTF-9000-QD is a Series 9000 Photoelectric Sensor from Allen-Bradley.