Mounting Accessories. captive safety clip. Ident. no.: 6900390. Captive safety clip for sensors with M12 x 1 connectors and approval according to ATEX II 3 G or II 3 D. For zone 2 (gas) or zone 22 (dust). For coupling nuts with a length of up to 11 mm. Safety label with imprint "nicht unter Spannung trennen / do not separate when energized. Securely attached to cable