Bently Nevada 991 Thrust Transmitter | 991-06-XX

Engineering Purpose

The 991-06-XX is a loop-powered transmitter designed to monitor shaft axial position in centrifugal compressors, pumps, and motors. It converts the displacement signal from a 3300 NSv probe into a 4-20 mA output, allowing direct machinery protection by tracking thrust bearing wear and preventing rotor-to-stator contact.

Technical Data Summary

• Component Type: 2-Wire Thrust Transmitter

• System Compatibility: 3300 NSv Proximity Probe

• Part Number: 991-06-XX

• Output Signal: 4 to 20 mA (Proportional to axial displacement)

• Accuracy: $\pm$0.5% of full scale

• Repeatability: $\pm$0.1% of full scale

• Power Supply: 12 to 30 Vdc (Loop-powered)

• Dimensions: 7.3 cm x 6 cm x 10 cm

Decoding the Model Configuration

• 991: Bently Nevada 991 series axial displacement/thrust platform.

• 06: Range Configuration. Specifically scaled for precise thrust measurement.

• XX: System Length Option. (Must be configured as 50 for 5.0m or 70 for 7.0m systems to match the probe and extension cable).