Excellent PLC
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| Add | Room 1004, No. 62 Xiangxiu Li, Siming District, Xiamen City, Fujian Province, China | |||||||
Product Overview
The Bently Nevada 991-06-70-01-05 Thrust Transmitter is a 2-wire, loop-powered device designed to provide an industry-standard 4–20 mA output proportional to axial shaft displacement. It is optimized for use in centrifugal compressors, small pumps, motors, and fans. The transmitter works with the 3300 NSv proximity probe and integrates signal conditioning within a compact, rugged enclosure.
Applications
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Centrifugal air compressors
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Small motors and pumps
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Axial thrust measurement in compact machinery
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OEM solutions for machinery protection
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Machinery requiring local monitoring with limited space
Key Advantages
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Compact & Integrated: Built-in Proximitor Sensor eliminates the need for external modules.
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Reliable Output: Provides 4–20 mA signal for PLCs and control systems.
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Diagnostics Ready: Offers PROX OUT signal via coaxial connector for vibration diagnostics.
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Flexible Mounting: Supports DIN rail or bulkhead installation.
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Signal Stability: Includes power-up inhibit and Not OK/Signal Defeat features.
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Harsh Environment Ready: Potted design tolerates up to 100% humidity.
Technical Specifications
| Parameter | Description |
|---|---|
| Model Number | 991-06-70-01-05 |
| Input | 3300 NSv Proximity Probe + Extension Cable |
| Output Signal | 4–20 mA linear over ±0.6 mm axial displacement |
| Loop Power Requirement | 12–35 Vdc |
| Loop Resistance Max | 1000 Ω @ 35 Vdc |
| Linear Range | ±0.6 mm (±25 mils) |
| Scale Factor (PROX OUT) | 7.87 mV/μm (200 mV/mil) ±6.5% |
| Temperature Range (Operation) | -35°C to +85°C (Transmitter), -52°C to +177°C (Probe) |
| Relative Humidity | 100% condensing |
| Mounting Options | DIN-rail clips or bulkhead screws |
| Weight | 0.43 kg |
| Dimensions | 100.1 x 73.9 x 53.3 mm |
| Material | Stainless Steel 303/304, PPS tip |
Frequently Asked Questions (FAQ)
Q1: What is the output signal range of the 991 Thrust Transmitter?
A1: The transmitter outputs a 4–20 mA signal proportional to shaft axial displacement.
Q2: What probes are compatible with this transmitter?
A2: It is compatible with the Bently Nevada 3300 NSv proximity probes.
Q3: Can this device be mounted on a DIN rail?
A3: Yes, it supports DIN rail or bulkhead mounting.
Q4: What happens during a Not OK condition?
A4: The output signal drops below 3.6 mA within 100 µs to avoid false alarms.
Q5: Is this transmitter suitable for hazardous locations?
A5: Yes, it meets CSA Division 2, ATEX Zone 0/2, and IECEx standards.
Q6: How is the signal isolated for diagnostics?
A6: Use the 990/991 Test Adapter to safely isolate the PROX OUT signal.
Q7: What is the minimum target size for reliable measurement?
A7: A minimum diameter of 9.5 mm is required.
Q8: What is the maximum cable length for PROX OUT signal?
A8: Up to 3 meters (10 feet) for PROX OUT to test equipment.
Q9: Is this a good alternative to continuous monitoring systems?
A9: It’s suitable for trending and basic alarming but lacks full monitoring features.
Q10: What certifications does this product hold?
A10: It complies with FCC, RoHS, ATEX, ABS maritime, and more.
Related Models in the Same Series
| Model Number | Description | Output Signal | System Length | Mounting |
|---|---|---|---|---|
| 991-06-50-01-05 | Same range, 5m system length | 4–20 mA | 5.0 m | DIN rail |
| 991-25-70-01-05 | ±25 mils range, 7m system | 4–20 mA | 7.0 m | DIN rail |
| 991-25-50-02-05 | ±25 mils, 5m, bulkhead mount | 4–20 mA | 5.0 m | Bulkhead |
| 991-06-70-02-05 | ±0.6 mm, 7m, bulkhead mount | 4–20 mA | 7.0 m | Bulkhead |
| 991-06-70-03-05 | ±0.6 mm, 7m, DIN & screw mount | 4–20 mA | 7.0 m | Dual |
| 991-25-70-03-05 | ±25 mils, 7m, DIN & screw mount | 4–20 mA | 7.0 m | Dual |
Popular Bently Nevada Models
| Model Number | Description | Output Type | Application | Dimensions (mm) | Weight (kg) |
|---|---|---|---|---|---|
| 3500/42M | Proximitor Seismic Monitor | Buffered / Relay | Vibration/Thrust Monitoring | 241.3 x 24.1 x 241.3 | 0.45 |
| 330104-00-06-10-11 | 8mm Proximity Probe | Dynamic/Gap | Proximity Monitoring | 91.4 x 8 x 8 | 0.08 |
| 3500/22M | Transient Data Interface Module | Rack-based | High-speed machinery analysis | 241.3 x 24.1 x 241.3 | 0.48 |
| 330130-040-00-00 | Extension Cable for Proximity System | N/A | Connectivity Extension | 4000 mm | 0.35 |
| 3500/15E | Power Supply Module | Rack-mounted | Powering 3500 Series Rack | 241.3 x 24.1 x 241.3 | 0.50 |
| 330180-91-CN | 3300 XL Proximitor Sensor | 4–20 mA | Shaft Vibration and Position | 100 x 80 x 50 | 0.42 |
