Product Overview
The Bently Nevada 991 Thrust Transmitter is a compact, 2-wire loop-powered device that converts axial shaft displacement into a 4–20 mA signal. Designed for OEM integration, it’s ideal for small machinery like centrifugal compressors, pumps, motors, or fans. It pairs with the 3300 NSv proximity probe system to /fer reliable axial position monitoring and trending.
Technical Specifications
| Parameter | 描述 |
|---|---|
| Input | 3300 NSv proximity probe & extension cable |
| Output Signal | 4 to 20 mA DC, 2-wire loop |
| Power Supply | 12 to 35 VDC |
| Loop Accuracy | ±1.5% full-scale |
| Max Loop Resistance | 1000 Ω at 35 VDC |
| Linear Range | 0.25 to 1.65 mm (10 to 65 mils) |
| Temperature (Operating) | -35°C to +85°C (transmitter) / -52°C to +177°C (probe) |
| Relative Humidity | 100% condensing (non-submerged) |
| Dimensions (L x W x H) | 100.1 x 73.9 x 53.3 mm |
| 重量 | 0.43 kg |
| Mounting Options | DIN rail or bulkhead screws |
| Certifications | ATEX, IECEx, CSA Div 2, RoHS, FCC, ABS Maritime |
Applications
-
OEM centrifugal air compressors
-
Small industrial pumps
-
Fans and electric motors
-
Systems requiring basic axial thrust trending
-
Limited-space installations
Key Advantages
-
Integrates with 3300 NSv probes for compact installs
-
Delivers industry-standard 4–20 mA signal for PLCs and DCS
-
Non-interacting zero/span adjustments
-
支持s diagnostics with “PROX OUT” and “COM” terminals
-
Built-in Not OK/Signal Defeat and Power-up Inhibit circuits
-
Rugged, potted construction for humid environments
常见问题 (FAQ)
Q1: What probe is compatible with the 991 Thrust Transmitter?
A1: The 991 is compatible with the Bently Nevada 3300 NSv proximity probe and extension cable.
Q2: What is the output signal format?
A2: The transmitter outputs a 4 to 20 mA DC signal proportional to axial shaft displacement.
Q3: Can it operate in hazardous areas?
A3: Yes, it is certified for CSA Division 2, ATEX Zone 0/2, and IECEx installations.
Q4: Is the PROX OUT signal isolated?
A4: No, it’s non-isolated. An external test adapter (122115-01) is recommended for safe diagnostics.
Q5: What is the minimum target size for accurate measurement?
A5: The minimum recommended target diameter is 9.5 mm (0.375 in).
Q6: Can the transmitter signal trigger alarms in control systems?
A6: Yes, the 4–20 mA signal can be used by external controllers for alarm logic.
Q7: What is the total loop resistance allowed?
A7: Up to 1000 ohms at 35 VDC input power.
Q8: What are the mounting options available?
A8: The 件 supports DIN-rail clips and bulkhead screws.
Q9: Is it suitable for continuous monitoring applications?
A9: No, it’s designed for trending and basic protection—not full system diagnostics like System 1.
Q10: What happens during a Not OK condition?
A10: The output drops below 3.6 mA within 100 µs to signal fault conditions.
Related 型号s (Same Series or Function)
| 型号 Number | 描述 | Output Type | Dimensions (mm) | 重量 |
|---|---|---|---|---|
| 991-01-06-01-01 | Thrust Transmitter, 0.6-0-0.6 mm range | 4–20 mA | 100.1 x 73.9 x 53.3 | 0.43 kg |
| 991-01-25-01-01 | Thrust Transmitter, 25-0-25 mils range | 4–20 mA | 100.1 x 73.9 x 53.3 | 0.43 kg |
| 990-08-XX-XX | Vibration Transmitter | 4–20 mA | 98 x 73 x 53 | 0.45 kg |
| 330901 | 3300 NSv Probe, 1/4-28 UNF, no armor | Probe only | Custom length | ~0.15 kg |
| 330902 | 3300 NSv Probe, 1/4-28 UNF, armored | Probe only | Custom length | ~0.18 kg |
| 122115-01 | 990/991 Test Adapter | Diagnostic Tool | Portable Kit | ~0.5 kg |
Popular Bently Nevada 型号s
| 型号 Number | 描述 | Signal Type | Dimensions (mm) | 重量 |
|---|---|---|---|---|
| 3500/42M-01-00 | Proximitor Seismic Monitor | Rack-based | 241 x 24 x 241 | ~0.6 kg |
| 3500/15-05-02-00 | Power Supply Module | AC/DC Module | 99 x 25 x 241 | ~0.5 kg |
| 3500/22M-01-01 | Transient Data Interface Module | TDI Module | 241 x 25 x 241 | ~0.6 kg |
| 3500/94M-02-00 | Display Monitor | Digital Display | 241 x 76 x 241 | ~1.2 kg |
| 330104-00-06-10 | 3300 XL Proximity Probe | Proximity Probe | Varies | ~0.15 kg |
| 330180-91-CN | 3300 XL Proximitor Sensor | Sensor Module | 82 x 76 x 36 | ~0.25 kg |
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