NLP 2.2 and Silverfast BW scanning without gray profile?

I have just started scanning some BW negatives in 16bit TIF with Silverfast 9 AI Studio. There doesn’t seem to be a gray profile assigned in the CMS preferences tab. So when i open the TIF in Photoshop i get a warning that there is no colorspace assigned.

Can i just assign gamma 2.2 and how will this effect NLP in Lightroom? The image seems to be very bright when converted in NLP v2.2. Is this normal?

Okay, seems BW need to be scanned 48bit positive as well.