Product Overview
The Bently Nevada 991 Thrust Transmitter is a 2-wire, loop-powered device designed for OEMs using centrifugal air compressors, pumps, motors, or fans. It converts shaft axial displacement from a 3300 NSv proximity probe into a 4–20 mA current signal, enabling easy integration into control systems for machinery protection and diagnostics.
Key Features
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Direct integration with 3300 NSv Proximity Probes
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Delivers 4–20 mA signal proportional to shaft thrust
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PROX OUT and COM terminals for vibration/gap diagnostics
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Built-in zero/span adjustments
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Signal defeat and power-up inhibit functions
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Potted design suitable for 100% condensing humidity
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DIN rail or bulkhead mounting options
Applications
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Centrifugal air compressors
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Small industrial pumps
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Electric motors and cooling fans
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Machinery requiring axial position monitoring
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OEM skid packages
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Areas with limited clearance or harsh environments
Advantages
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Compact and rugged for tight installations
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Accurate axial position monitoring with fast signal recovery
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Supports portable diagnostics with dynamic output
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Enhanced signal integrity with recommended test adapter
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Complies with global certifications (CSA, ATEX, IECEx)
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Maintains loop protection from faulty probe or wiring issues
Technical Specifications
| Parameter | Value |
|---|---|
| Input | 3300 NSv Proximity Probe (1 probe + extension cable) |
| Power Supply | +12 to +35 VDC |
| Output Signal | 4–20 mA |
| Loop Accuracy | ±1.5% full scale |
| Max Loop Resistance | 1000 Ω @ 35 VDC |
| Current Limiting | 23 mA typical |
| Zero/Span Adjustments | External potentiometers |
| Linear Range (Prox Out) | 0.25 to 1.65 mm (10 to 65 mils) |
| Temperature Stability | ±10% (0°C to +70°C) |
| Operating Temp (Transmitter) | -35°C to +85°C |
| Operating Temp (Probe) | -52°C to +177°C |
| Relative Humidity | 100% condensing, non-submerged |
| Case Material | AISI 303/304 Stainless Steel |
| Dimensions | 100.1 x 73.9 x 53.3 mm |
| Gewicht | 0.43 kg |
FAQ
Q1: What is the main function von the 991 Thrust Transmitter?
A1: It converts axial shaft displacement into a 4–20 mA signal for machinery monitoring.
Q2: What sensor is compatible with this transmitter?
A2: It works with the Bently Nevada 3300 NSv proximity probe and matching extension cables.
Q3: Can I use this in hazardous areas?
A3: Yes, it has approvals for CSA Division 2, ATEX Zone 0/2, and IECEx.
Q4: Is the PROX OUT signal isolated?
A4: No, use the 122115-01 Test Adapter for safe connection to AC-powered test equipment.
Q5: What mounting options are available?
A5: It supports DIN-rail clips and bulkhead screws as standard.
Q6: What happens if the probe becomes disconnected?
A6: The output drops below 3.6 mA within 100 µs to avoid false alarms.
Q7: What is the linear output range?
A7: 0.25 to 1.65 mm (10 to 65 mils) for the Prox Out dynamic signal.
Q8: Can it be used for plant-wide diagnostics?
A8: No, it’s not suitable for systems like System 1. It’s intended for simpler monitoring setups.
Q9: What’s the typical leadwire distance for the Proximitor output?
A9: Up to 3 meters (10 feet) from the transmitter to the BNC diagnostic output.
Q10: What tools are recommended for testing?
A10: Use the 122115-01 Test Adapter for signal isolation and analysis with oscilloscopes.
Related Modells (Same Series or Compatible)
| Modell | Beschreibung | Output Signal | Mounting Type | Cable Length |
|---|---|---|---|---|
| 991-06-70-01-01 | 991, 0.6 mm range, 7 m cable, DIN mount | 4–20 mA | DIN rail | 7 m |
| 991-25-50-02-05 | 991, 25 mil range, 5 m cable, bulkhead mount | 4–20 mA | Bulkhead | 5 m |
| 991-06-50-03-01 | 991, 0.6 mm range, 5 m cable, DIN + screw mount | 4–20 mA | DIN/screws | 5 m |
| 330901-00-50-01-00 | NSv Probe, 1/4-28 thread, 5 m, no armor | Voltage | Thread mount | 5 m |
| 330902-00-70-01-00 | NSv Probe, 1/4-28 thread, 7 m, with armor | Voltage | Thread mount | 7 m |
| 122115-01 | Test Adapter for PROX OUT signal isolation | — | Portable | — |
Popular Bently Nevada Modells
| Modell | Beschreibung | Function | Signal Type | Dimensions (mm) | Gewicht |
|---|---|---|---|---|---|
| 3500/42M | Proximitor Seismic Monitor | Vibration Monitoring | Dynamic | 241 x 24 x 99 | 0.5 kg |
| 3500/22M | Transient Data Interface Module | Data Interface | Digital | 241 x 24 x 99 | 0.4 kg |
| 3500/25 | Keyphasor Module | Speed and Phase Monitoring | Digital | 241 x 24 x 99 | 0.45 kg |
| 3500/15 | Power Supply Module | Power Conversion | — | 241 x 24 x 99 | 0.6 kg |
| 3500/32M | 4-Channel Relay Module | Relay Control | Relay | 241 x 24 x 99 | 0.45 kg |
| 330104-00-10-10-02 | 3300 XL 8mm Proximity Probe | Shaft Vibration Measurement | Voltage | 90.4 x 8 x 8 (tip) | 0.3 kg |
Unternehmensinformationen
E-mail: [email protected]
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Add: Alishan Building, 2 Lvling Rd, Bezirk Siming, Xiamen, Fujian, China, 361006
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