Excellent PLC
| Company Information | ||||||||
| [email protected] | ||||||||
| Mobile | +8613666033393 | |||||||
| +8613666033393 | ||||||||
| 13666033393 | ||||||||
| Add | Room 1004, No. 62 Xiangxiu Li, Siming District, Xiamen City, Fujian Province, China | |||||||
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 offer reliable axial position monitoring and trending.
Technical Specifications
| Parameter | Description |
|---|---|
| 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 |
| Weight | 0.43 kg |
| Mounting Options | DIN rail or bulkhead screws |
| Certifications | ATEX, IECEx, CSA Div 2, RoHS, FCC, ABS Maritime |
Applications
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OEM centrifugal air compressors
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Small industrial pumps
-
Fans and electric motors
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Systems requiring basic axial thrust trending
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Limited-space installations
Key Advantages
-
Integrates with 3300 NSv probes for compact installs
-
Delivers industry-standard 4–20 mA signal for PLCs and DCS
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Non-interacting zero/span adjustments
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Supports diagnostics with “PROX OUT” and “COM” terminals
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Built-in Not OK/Signal Defeat and Power-up Inhibit circuits
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Rugged, potted construction for humid environments
Frequently Asked Questions (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 unit 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 Models (Same Series or Function)
| Model Number | Description | Output Type | Dimensions (mm) | Weight |
|---|---|---|---|---|
| 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 Models
| Model Number | Description | Signal Type | Dimensions (mm) | Weight |
|---|---|---|---|---|
| 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 |
