991-06-XX-01-00 / MOD 169955-01 Dual-Direction Axial Displacement Thrust Transmitter for Centrifugal Compressor Shaft Protection The Bently Nevada 991-06-XX-01-00 (MOD 169955-01) is a 2-wire thrust transmitter that converts 3300XL 8mm probe signals into a 4-20 mA loop for reliable axial displacement monitoring. 0.6-0-0.6 mm Range: High-precision bidirectional tracking to trigger DCS alarms before rotor collision. 3 Vdc @ 20 mils Elec Zero: Fast probe gap calibration via a