Infrared fork light barriers: PMI 6 mm types - with 3-pin connector M8 PMI 6 mm types - with free cable end 1,5 m PDI 6 mm types - with 3-pin connector M8 PDI 6 mm types - with free cable end 1,5 m PXI types PSI 8 mm types - constant light trigger PSI 8 mm types - chopped light trigger PKI 10 mm types - PKI-10/K... PKI-20/K PKI 10 mm types - PKI-20... PKI-80