Product Overview
The Bently Nevada 991 Thrust Transmitter is a loop-powered 4–20 mA transmitter designed to monitor shaft axial position (thrust position) in rotating machinery. It is especially suited for OEMs / centrifugal compressors, small pumps, motors, and fans. The device integrates signal conditioning and eliminates the need for a separate Proximitor, simplifying installation and reducing space requirements.
Key Features
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Integrated Proximitor Sensor (no external 件 needed)
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4–20 mA loop-powered output
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Compatible with 3300 NSv probes
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Adjustable zero and span settings
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Diagnostic output (PROX OUT) via coaxial connector
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Built-in signal defeat and power-up inhibit circuits
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支持s DIN rail or bulkhead mounting
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Fully potted for use in humid environments (up to 100% RH)
Applications
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Centrifugal compressors
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Industrial fans and motors
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OEM packaged rotating machinery
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Small pump assemblies
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状态 monitoring and diagnostics
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Environments requiring compact axial position monitoring
Product Advantages
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Simplifies thrust position monitoring in space-constrained installations
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Provides reliable 4–20 mA signal directly to control systems
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Minimizes wiring and hardware complexity
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支持s diagnostics via PROX OUT output
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Withstands harsh environmental conditions
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Integrates easily into hazardous area applications (Zone 0, 2, Div 2)
Technical Specifications
| Parameter | Value |
|---|---|
| Input | 3300 NSv proximity probe & extension cable |
| Power Supply | +12 to +35 Vdc |
| Output | 4–20 mA loop signal |
| Accuracy | ±1.5% full scale (typical) |
| Max Loop Resistance | 1000 Ω at 35 Vdc |
| Signal Defeat (Not OK) Response | <3.6 mA within 100 μs |
| Linear Range | ±0.6 mm or ±25 mils |
| Temperature Range (Operating) | -35°C to +85°C (transmitter) |
| Humidity | 100% condensing |
| Mounting Options | DIN-rail or bulkhead |
| Dimensions | 100.1 x 73.9 x 53.3 mm |
| 重量 | 0.43 kg |
常见问题 (FAQ)
Q1: What type / probe is compatible with the 991 Thrust Transmitter?
A1: It is compatible with the 3300 NSv proximity probe and extension cable.
Q2: What output does the 991 provide?
A2: It provides a 4–20 mA loop signal proportional to axial thrust displacement.
Q3: Can the transmitter be used in hazardous areas?
A3: Yes, it is certified for use in ATEX Zone 0, Zone 2, and CSA Division 2 environments.
Q4: Does the device support diagnostics?
A4: Yes, via the PROX OUT terminal and coaxial connector for dynamic signal output.
Q5: Is external signal conditioning required?
A5: No, it has an integrated proximitor sensor that eliminates the need for an external 件.
Q6: How do you verify the output signal?
A6: A Test Input pin allows verification using a DC voltage source.
Q7: What happens in case / a probe fault?
A7: The Not OK/Signal Defeat function drops the signal below 3.6 mA to prevent false alarms.
Q8: What mounting options are available?
A8: DIN rail clips and bulkhead screws are available.
Q9: Is it suitable for humid environments?
A9: Yes, the 件 is fully potted to tolerate 100% condensing humidity.
Q10: What is the recommended target material?
A10: The system is calibrated for AISI 4140 steel targets.
Related 型号s in the Same Series
| 型号 Number | 描述 | System Length | Mount Type | Approval |
|---|---|---|---|---|
| 991-06-50-01-00 | 0.6 mm range, 5 m cable, DIN mount | 5.0 m | DIN rail | No approval |
| 991-25-70-02-01 | 25 mils range, 7 m cable, bulkhead mount | 7.0 m | Bulkhead | CSA Div 2 |
| 991-06-70-03-00 | 0.6 mm range, 7 m cable, DIN+bulkhead | 7.0 m | Combo | No approval |
| 991-25-50-01-05 | 25 mils range, 5 m cable, DIN mount | 5.0 m | DIN rail | Full Cert. |
| 991-06-50-02-05 | 0.6 mm range, 5 m cable, bulkhead mount | 5.0 m | Bulkhead | Full Cert. |
| 991-25-70-03-05 | 25 mils range, 7 m cable, DIN+bulkhead | 7.0 m | Combo | Full Cert. |
Popular 型号s from Bently Nevada
| 型号 Number | 描述 | Signal Type | Application | Dimensions (mm) | 重量 |
|---|---|---|---|---|---|
| 3500/42M-01-00 | Proximitor Seismic Monitor | Dynamic | Vibration Monitoring | 241 x 24 x 241 | 0.5 kg |
| 330104-00-06-10-11-00 | 3300 XL 8 mm Proximity Probe | Proximity | Shaft Vibration | 80 x 12 x 12 | 0.2 kg |
| 330180-91-CN | 3300 XL Proximitor Sensor | Dynamic | Displacement Monitoring | 62 x 48 x 25 | 0.25 kg |
| 3500/44M-02-00 | Aeroderivative GT Vibration Monitor | Dynamic | Turbomachinery Monitoring | 241 x 24 x 241 | 0.48 kg |
| 3500/25-01-01-00 | Keyphasor Module | Pulse | Speed/Phase Detection | 241 x 24 x 241 | 0.45 kg |
| 3500/22M-01-01-00 | Transient Data Interface (TDI) Module | Digital | System Communication | 241 x 24 x 241 | 0.45 kg |
公司信息
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