The 330180-91-05 is a 9m Bently Nevada 3300 XL Proximitor sensor with a DIN-rail base, 80 mil linear range, and SpringLoc terminals for hazardous zones.
The 990-04-50-02-00 is a 2-wire Bently Nevada transmitter (0-4 mils pp, 5m system) converting 3300 NSv probe inputs to a 4-20mA signal for OEM machinery.