ors ▁or ▁las er ▁safety ▁sensor ▁are ▁normally ▁used . ▁Four ▁types ▁are ▁commonly ▁used . ▁Header ▁mounted ▁presence ▁sensor ▁– ▁Mount ed ▁on ▁the ▁j amb ▁above ▁the ▁door , ▁on ▁the ▁approach ▁side , ▁it ▁detect s ▁the ▁presence ▁of ▁a ▁person ▁standing ▁in ▁front ▁of ▁the ▁door . ▁Appro ach ▁side , ▁door ▁mounted ▁sensor ▁– ▁Mount ed ▁on ▁the ▁approach ▁side ▁of ▁the ▁door ▁itself , ▁used ▁as ▁the ▁door ▁is ▁closing ▁to ▁detect ▁a ▁user ▁in ▁the ▁way ▁of ▁the ▁closing ▁door . ▁Some ▁safety ▁sensor ▁also ▁saf egu ard ▁the ▁h inge ▁area ▁to ▁protect ▁hands ▁and ▁fingers ▁during ▁the ▁closing ▁process . ▁In ▁that ▁case , ▁the ▁operator ▁either ▁stops ▁the ▁door ▁or ▁re opens ▁it . ▁Sw ing ▁side , ▁door ▁mounted ▁sensor ▁– ▁Mount ed ▁on ▁the ▁swing ▁side ▁of ▁the ▁door ▁itself , ▁used ▁as ▁the ▁door ▁is ▁opening ▁to ▁detect ▁a ▁user ▁in ▁the ▁way ▁of ▁the ▁opening ▁door . ▁In ▁that ▁case , ▁the ▁operator ▁stops ▁the ▁door . ▁The ▁sens itivity ▁of ▁inf ra red ▁sens ors ▁must ▁be ▁reduced ▁at ▁the ▁end ▁of ▁the ▁opening ▁angle , ▁if ▁it ▁starts ▁seeing ▁a ▁wall ▁next ▁to ▁the ▁door , ▁so ▁it ▁may ▁not ▁conf use ▁it ▁with ▁a ▁user . ▁Las er ▁based ▁sens ors ▁increase ▁the ▁safety ▁by ▁learning ▁the ▁surr ound ings ▁of ▁the ▁door ▁and ▁dynamically ▁adapt ▁their ▁detection ▁fields ▁to ▁only ▁ignore ▁the ▁wall ▁next ▁to ▁the ▁door . ▁Saf ety ▁beam ▁– ▁This ▁beam ▁cross