I installed a line with 2 of the LTF sensors. One 12 meters as yours, one 24 meters.
Lead 1 (Brown) is +24VDC
3 (Blue) 0VDC
2 (White) 4-20mA output (mA on mine, can be 0-10VDC if 12-U)
4 (Black) Optional relay output if programmed (not used on mine)
5 (Gray) Remote programming input - also not used, this is if you want to program it from the ground
See P 7:
Banner LTF Manual
EDIT: I will add programming the first one may seem like an overwhelming task! Good luck and don't give up.