Detection sesnor used in commercial photoelectric sensor?

[Shahriar]

Hi

Does anybody know what kind of sensor (photo diode) manufacturer uses in Red light photo electric sensor? 

Specially receiver?

I have found BPW34, but think manufacturers uses something else.

Look at this through beam from Optex

https://www.optex-ramco.com/index.php?route=product/product&product_id=2066&search=Ctd-2500&description=true

Thanks

Shahriar