Bently Nevada 991-50-XX-01-00 Axial Displacement

Engineering Purpose

The 991-50-XX-01-00 is a 2-wire, loop-powered transmitter specifically calibrated for axial displacement monitoring. It converts the displacement signal from a 3300 NSv probe into a 4-20 mA output, representing the shaft's position relative to the thrust bearing. With a $\pm$0.5 mm range, it provides critical real-time data to prevent catastrophic internal rotor contact.

Technical Data Summary

• Component Type: 2-Wire Thrust Transmitter

• System Compatibility: 3300 NSv Proximity Probe

• Part Number: 991-50-XX-01-00

• Full-Scale Range: $\pm$0.5 mm (1.0 mm total span)

• System Length: Configurable (XX = 50 for 5.0m or 70 for 7.0m)

• Mounting Type: 35 mm DIN rail clips (01)

• Agency Approval: Not required / Standard (00)

• Accuracy: $\pm$1.5% over full-scale range (typical)

• Power Supply: +12 to +35 Vdc

Decoding the Model Configuration

• 991: Bently Nevada 991 series axial position/thrust transmitter platform.

• 50: Thrust Range Option. Specifically scaled for a $\pm$0.5 mm measurement envelope.

• XX: System Length Option. (Must be 50 for 5.0m or 70 for 7.0m to match the total probe/cable length).

• 01: Equipped with 35 mm DIN rail clips for rapid installation in standard control cabinets.

• 00: Standard version intended for non-hazardous or general industrial locations.