Product Short Description
The 991-01-XX-01-00 is a purpose-built industrial thrust transmitter manufactured by Bently Nevada (USA). It converts shaft axial displacement signals from the 3300 NSv series non-contact proximity probe system into a standardized 4–20 mA DC loop-powered output, enabling real-time monitoring of rotor axial position for critical rotating machinery. Designed for original equipment manufacturers (OEMs) seeking a compact, easy-to-integrate solution for machinery protection and control, it serves as a core component in condition monitoring systems across high-demand industrial sectors.
Description
Basic Identification Parameters
| Parameter | Value |
|---|---|
| Brand | Bently Nevada |
| Main Model | 991-01-XX-01-00 |
| Module Code | 288865-01 |
| Origin | United States |
| Weight | 0.43 kg |
| Warranty | 12 months factory original warranty |
| Mounting Options | 35 mm DIN rail clip / bulkhead screw mounting |
| Dimensions | 115 × 65 × 35 mm |
Electrical Specifications
| Parameter | Value |
|---|---|
| Power Supply | 12–35 V DC, 2-wire loop-powered |
| Loop Current | ≤30 mA (max), typical 20 mA @ 24 V DC |
| Output Signal | 4–20 mA DC proportional to shaft axial position |
| Loop Accuracy | ±1.5% of full scale |
| Maximum Loop Resistance | 1,000 Ω (including cable at 35 V DC) |
| Input Impedance | ~10 kΩ (Prox Out) |
| Current Limiting | 23 mA (typical) |
| Not OK Response | <3.6 mA within 100 µs; recovery in ~0.1 s |
Measurement & Environmental Specifications
| Parameter | Value |
|---|---|
| Compatible Probe System | 3300 NSv series proximity probe + extension cable (5 m/7 m standard) |
| Linear Range | 0.25–1.65 mm (10–65 mils) |
| Scale Factor | ~7.87 mV/µm (200 mV/mil) ±6.5% typical |
| Minimum Target Diameter | 9.5 mm |
| Operating Temperature | -35 ℃ to +85 ℃ |
| Storage Temperature | -51 ℃ to +100 ℃ |
| Humidity Rating | 0%–100% RH (condensing) |
| Protection Grade | IP67 |
| Certifications | CE, CSA/NRTL/C, ATEX/IECEx, ABS Maritime |
Core Functional Features
-
Integrated Proximitor Design
Eliminates the need for an external proximity sensor module, simplifying field wiring and installation while reducing system footprint.
-
Dual Diagnostic Outputs
Non-isolated PROX OUT & COM terminals plus a BNC coaxial connector simultaneously output dynamic vibration waveform and gap voltage signals for on-site troubleshooting.
-
Non-Interactive Zero & Span Adjustment
Independent potentiometers under the unit label allow precise calibration of zero point and measurement range without disassembly.
-
Built-In Test Input Pin
Enables rapid loop output verification using a variable DC voltage source, supporting quick maintenance checks and system validation.
-
Advanced Fault Protection
- Power-up Inhibit Circuitry: Mitigates signal errors caused by line voltage transients during startup.
- Not OK/Signal Defeat Logic: Automatically detects probe faults or loose connections, preventing high-output false alarms and ensuring system safety.
-
Robust Environmental Hardening
Potted construction and IP67 rating enable operation in high-humidity, high-vibration, and harsh industrial environments, including Zone 2/ATEX Zone 2 hazardous locations.
-
Long-Distance Signal Transmission
Supports up to 13 km (8 miles) of cable length between the transmitter and control system, ideal for large-scale plant layouts.
Applicable Application Scenarios
- Oil & Gas: Centrifugal compressors, gas turbines, pumps, and flow meters in upstream/downstream facilities
- Power Generation: Steam turbines, gas turbines, and generator sets in thermal, hydro, and combined-cycle plants
- HVAC & Industrial Fans: Large-diameter fans and blowers with critical thrust requirements
- Water & Wastewater: Submersible pumps and vertical turbine pumps
- Heavy Industry: Cement mills, mining machinery, and large-scale gearboxes
- Marine: Shipboard propulsion systems and auxiliary machinery (ABS-approved)
- OEM Machinery: Custom machinery requiring compact, cost-effective thrust monitoring solutions
System Compatibility
- Probe Compatibility: Fully mates with Bently Nevada 3300 NSv series proximity probes and extension cables (5 m/7 m standard lengths).
- Control System Integration: Seamlessly connects to PLC, DCS, machinery protection systems, and SCADA platforms via the 4–20 mA loop signal.
- Diagnostic Compatibility: Works with Bently Nevada 122115-01 Test Adapter for signal inversion, isolation, and connection to oscilloscopes or diagnostic equipment.
Ordering & Configuration Notes
- XX: Full-scale range (e.g., 06 = 0.6 mm / 25 mils; 25 = 25–0–25 mils)
- 01: System length (5 m standard; 7 m optional)
- 00: Agency approval (CSA Division 2/ATEX Zone 2 with ABS maritime approval)
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