Bently Nevada 991-05-50-01-00 – Thrust / Axial Position Transmitter | 3500 Series Platform
Engineering Background
The Bently Nevada 3500 Series is the industry benchmark for continuous machinery protection in rotating equipment applications — turbines, compressors, pumps, and generators. The 991-05-50-01-00 is a dedicated thrust (axial position) transmitter designed to interface with 3300 XL 8mm proximity probe systems, converting raw eddy-current gap signals into a 4–20 mA process output suitable for DCS, PLC, and safety instrumented system (SIS) integration.
Product Positioning
Procurement engineers specifying axial position monitoring for API 670-compliant machinery protection systems will find the 991-05-50-01-00 a direct, drop-in solution. It eliminates the need for external signal conditioning and delivers a fully isolated, loop-powered output that integrates cleanly into existing 3500 rack architectures or standalone field-mount enclosures.
Complete Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 991-05-50-01-00 |
| Manufacturer | Bently Nevada (Baker Hughes) |
| Series / Platform | 3500 Series Machinery Protection |
| Function | Thrust / Axial Position Transmitter |
| Compatible Probe System | 3300 XL 8mm Proximity Probe |
| Output Signal | 4–20 mA (loop-powered) |
| Measurement Range | Axial position per probe system calibration |
| Power Supply | 24 VDC nominal (loop-powered) |
| Isolation | Galvanic isolation, input-to-output |
| Compliance | API 670, CE |
| Enclosure / Form Factor | DIN-rail / panel-mount transmitter |
| Weight | 290 g |
| Operating Temperature | -40 °C to +85 °C |
| SKU | 991-05-50-01-00 |
Proven Application Environments
- Steam & Gas Turbines — continuous axial thrust monitoring per API 670 requirements
- Centrifugal Compressors — rotor position feedback for surge and thrust-bearing protection
- Pumps & Fans — axial displacement trending and alarm setpoint management
- Power Generation — integration with DCS/SIS for automated trip logic
- Petrochemical & Refinery — hazardous-area installations with appropriate housing
- LNG & Offshore Platforms — harsh-environment continuous monitoring
Engineering Advantages
- Direct 3500 Series Compatibility — no additional signal conditioning required; plug-and-play with existing rack infrastructure
- Loop-Powered 4–20 mA Output — universal interface to any DCS, PLC, or safety controller without auxiliary power wiring
- Galvanic Isolation — eliminates ground loops and protects control system inputs from field-side transients
- API 670 Compliant — meets the international standard for machinery protection instrumentation
- Wide Temperature Range — reliable operation from arctic cold to high-ambient process environments
- Compact Form Factor — DIN-rail mountable; minimizes panel space in retrofit and greenfield installations
System Architecture & Signal Flow
The 991-05-50-01-00 sits between the proximity probe/driver assembly and the control system:
- Probe Gap → Driver Voltage: 3300 XL 8mm proximity probe generates a DC voltage proportional to rotor-to-probe gap.
- Driver Output → Transmitter Input: The 991-05-50-01-00 receives the conditioned driver signal.
- Transmitter → 4–20 mA Loop: Converts and scales the signal to a standard process current loop.
- Loop → DCS / SIS / PLC: Analog input card reads position value; alarm and trip logic executes in the control system.
This architecture ensures the control system receives a clean, isolated, industry-standard signal regardless of field-side noise or ground potential differences.
Sourcing & Quality Verification
- All units sourced from authorized distributors or verified OEM-surplus channels
- Pre-shipment inspection: visual, label verification, and functional continuity check
- Original manufacturer packaging preserved where available
- Traceability documentation (CoC / test records) available on request
- 30-day return window for DOA units; warranty terms provided at quotation
Procurement Process
- Submit RFQ — email support@konmask.com with quantity, required delivery, and any project-specific documentation needs
- Quotation — receive itemized quote with lead time, unit price, and shipping options within 1 business day
- Order Confirmation — PO accepted via email; proforma invoice issued for prepayment or net terms (approved accounts)
- Shipment — DHL / FedEx / SF Express with full tracking; export documentation included for cross-border orders
- After-Sales — technical support available post-delivery; replacement or credit processed for verified defects
Technical FAQ
Q: Is the 991-05-50-01-00 compatible with the 3500/42M position monitor module?
A: Yes. The transmitter output is compatible with any 4–20 mA analog input, including the 3500/42M and equivalent position monitor cards.
Q: Can this transmitter be used with probes other than the 3300 XL 8mm series?
A: The unit is calibrated for the 3300 XL 8mm probe/driver system. Use with other probe systems requires re-calibration and is not recommended without engineering review.
Q: What is the typical lead time?
A: In-stock units ship within 3–5 business days. Out-of-stock items are quoted with lead time at RFQ stage.
Q: Do you provide calibration certificates?
A: Factory calibration records are provided where available. Third-party calibration can be arranged on request.
Q: Is this unit suitable for SIL-rated safety loops?
A: The 991-05-50-01-00 is API 670 compliant. SIL suitability depends on the overall safety loop design; consult your functional safety engineer for SIL assessment.
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