Bently Nevada 991-06-50-01-01 991 Thrust Transmitter The Bently Nevada 991-06-50-01-01, also cataloged as the 991 Thrust Transmitter, operates as a...
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The Bently Nevada 991-06-50-01-01, also cataloged as the 991 Thrust Transmitter, operates as a dedicated hardware component for axial shaft position measurement using proximity probe signals within machinery monitoring systems.
Hardware Specifications
Parameter
Specification
Model
991-06-50-01-01
Brand
Bently Nevada
Product Type
991 Thrust Transmitter
Origin
USA
Weight
0.44 kg
Dimensions
7.3 x 6 x 10 cm (estimated shipping size)
Operating Temp
Not specified
Power Consumption
Requires +12 to +35 VDC input at transmitter terminal
Input Signal
Proximity probe input for thrust position measurement
Output Signal
4-20 mA proportional current output
Loop Resistance
Maximum 1,000 ohms including cable at 35 VDC
Current Limiting
23 mA typical
Cable Length Option
5.0 metres (16.4 feet)
Mounting Option
35 mm DIN rail clips
Certification Option
CSA Division 2
Eddy-Current Probe Scaling and TSI Signal Processing
The Bently Nevada 991 Thrust Transmitter processes eddy-current probe signals to convert shaft axial displacement into a proportional 4-20 mA output signal. The transmitter maintains probe scaling characteristics required for thrust position monitoring and interfaces with TSI system architectures.
The device supports gap voltage validation principles used in eddy-current measurement systems. Proper probe installation requires verification of the probe operating gap and electrical signal conditions, including the typical -10 VDC target gap voltage used in Bently Nevada proximity probe systems.
The transmitter provides signal conditioning for rotor axial movement measurement. It is designed to preserve displacement information from rotating machinery thrust monitoring points while reducing measurement errors caused by electrical interference and signal instability.
Frequently Asked Questions
Q: What type of input signal does the 991-06-50-01-01 process? A: The transmitter accepts signals from compatible proximity probe systems for axial shaft displacement measurement and converts the measurement into a 4-20 mA output.
Q: What power supply is required for the transmitter? A: The unit requires +12 to +35 VDC input applied at the transmitter terminal.
Q: What is the maximum allowable loop resistance? A: The maximum loop resistance is 1,000 ohms including cable resistance when operating at 35 VDC.
Field Installation Guidelines
Install the transmitter on a suitable 35 mm DIN rail mounting system when DIN rail clips are provided. Maintain proper mechanical fixation to prevent vibration-induced movement.
Use shielded signal wiring according to site instrumentation practices. Connect cable shields using appropriate grounding methods to minimize electrical interference from power cables, variable frequency drives, and high-current equipment.
Route proximity probe wiring separately from high-voltage conductors and avoid parallel cable paths with strong electromagnetic sources. Verify probe connections, power polarity, and current loop continuity before commissioning.
Confirm the proximity probe gap condition and transmitter output scaling after installation. Validate the 4-20 mA loop response against the expected thrust position range before placing the machinery monitoring circuit into service.
