Bently Nevada 991-06-50-01-CN 991 Thrust Transmitter The Bently Nevada 991-06-50-01-CN, also cataloged as the 991 Thrust Transmitter, operates as a...
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The Bently Nevada 991-06-50-01-CN, also cataloged as the 991 Thrust Transmitter, operates as a dedicated hardware component for axial shaft displacement measurement within machinery protection monitoring systems.
Hardware Specifications
Parameter
Specification
Model
991-06-50-01-CN
Brand
Bently Nevada
Product Type
991 Thrust Transmitter
Origin
USA
Weight
0.43 kg
Dimensions
Not specified in available technical data
Operating Temp
-35 deg C to +85 deg C
Power Consumption
Loop-powered, supplied from 12 to 35 VDC loop power
Measurement Type
Axial displacement / thrust position
Input Sensor
3300 NSv Proximity Probe
Output Signal
4-20 mA proportional current output
Loop Configuration
2-wire loop-powered transmitter
Full Scale Option
0.6-0-0.6 mm thrust measurement range
System Length
5.0 m
Mounting Method
35 mm DIN-rail mounting clips
Maximum Loop Resistance
1,000 ohms at 35 VDC
Probe Linear Range
0.25 to 1.65 mm
Prox Out Scale Factor
7.87 mV/um (200 mV/mil) typical
Loop Accuracy
±1.5% of specified full-scale range typical
Fault Detection
Not OK output reduction below 3.6 mA within 100 us after fault detection
Probe Operating Temperature
-52 deg C to +177 deg C
Eddy-Current Probe Scaling and Rotor Dynamics Monitoring
The 991-06-50-01-CN transmitter processes eddy-current proximity probe signals from the 3300 NSv sensor system and converts displacement measurements into a linear 4-20 mA output. The signal conditioning circuit maintains the relationship between probe gap variation and axial shaft position.
The transmitter supports gap voltage validation during commissioning. The probe system uses a negative bias voltage measurement method, with typical gap verification referenced around the -10 VDC operating target for eddy-current probe calibration.
The unit provides PROX OUT diagnostic access for monitoring probe gap conditions and dynamic signal behavior. The design supports rotor dynamics analysis by maintaining proportional displacement information required for thrust position monitoring.
Frequently Asked Questions
Q: What input sensor is required for the Bently Nevada 991-06-50-01-CN? A: The transmitter requires a compatible Bently Nevada 3300 NSv proximity probe and matching extension cable system for axial displacement measurement.
Q: What electrical output does the 991-06-50-01-CN provide? A: The transmitter provides a 4-20 mA proportional current output through a 2-wire loop-powered configuration.
Q: What mounting method is used for this transmitter? A: The unit uses 35 mm DIN-rail mounting clips for installation inside industrial control cabinets.
Field Installation Guidelines
Install the transmitter on a correctly secured 35 mm DIN rail inside a protected enclosure.
Verify probe wiring polarity and cable shielding before applying loop power.
Maintain separation between probe signal wiring and high-voltage power cables to reduce electrical interference.
Confirm the probe gap voltage during commissioning before performing thrust position calibration.
Connect the 4-20 mA loop according to the receiving PLC, DCS, or machinery protection input requirements.
Verify grounding practices for shielded instrumentation cables according to site electrical standards.
