Bently Nevada 990-05-XX-03-01 – 4–20 mA Vibration Transmitter | 3300 Series Platform
Engineering Background
The Bently Nevada 990 Series Vibration Transmitter is a field-proven signal conditioning module engineered to interface directly with 3300 Series proximity probe systems. Designed for continuous machinery health monitoring in rotating equipment applications, the 990-05-XX-03-01 (MOD:168251-01) converts raw eddy-current proximity probe signals into industry-standard 4–20 mA analog outputs, enabling seamless integration with PLCs, DCS platforms, and SCADA systems without additional signal conditioning hardware.
Product Positioning
This transmitter occupies a critical position in turbomachinery protection architectures — bridging the gap between raw proximity probe output and plant-level control infrastructure. It is the preferred choice for maintenance engineers and reliability teams seeking a drop-in replacement or system expansion module that maintains OEM-level accuracy and compatibility with existing Bently Nevada 3300 Series installations.
Complete Technical Specifications
| Part Number | 990-05-XX-03-01 |
| Modification Code | MOD:168251-01 |
| Series / Platform | Bently Nevada 3300 Series |
| Function | Vibration Signal Transmitter (Proximity Probe Interface) |
| Output Signal | 4–20 mA (2-wire, loop-powered) |
| Input Compatibility | Bently Nevada 3300 Series Proximity Probes & Extension Cables |
| Measurement Parameter | Radial Vibration / Shaft Displacement |
| Supply Voltage | 18–30 VDC (loop-powered) |
| Operating Temperature | –40°C to +85°C |
| Enclosure / Housing | DIN-rail mountable, compact module |
| Approvals | CE, cULus (refer to OEM datasheet for full certification list) |
| Weight | ~60 g |
| Country of Origin | United States |
Proven Application Environments
- Gas & Steam Turbines – Continuous shaft radial vibration monitoring for OEM protection systems
- Centrifugal Compressors – Real-time displacement feedback integrated into surge control loops
- Pumps & Fans – Early-warning vibration trending for predictive maintenance programs
- Gearboxes – High-frequency vibration signal conditioning for gear mesh analysis
- Power Generation – Generator rotor eccentricity and bearing condition monitoring
- Petrochemical & Refinery Plants – SIL-rated machinery protection loops requiring 4–20 mA transmitter outputs
Engineering Advantages
- Direct 3300 Series Compatibility – Plug-compatible with existing Bently Nevada probe and extension cable assemblies; no re-cabling required
- Universal PLC/DCS Integration – Standard 4–20 mA output accepted by all major control platforms (Siemens, Rockwell, Honeywell, ABB, Emerson)
- Loop-Powered Design – Eliminates need for separate transmitter power supply; simplifies field wiring
- High Noise Immunity – Shielded signal path maintains accuracy in high-EMI industrial environments
- Compact DIN-Rail Form Factor – Minimizes panel space; suitable for retrofit and greenfield installations
- Wide Temperature Range – Qualified for outdoor and harsh-environment enclosures without derating
System Architecture & Signal Flow
The 990-05-XX-03-01 operates within the standard Bently Nevada 3300 Series signal chain:
- Proximity Probe (3300 XL 8mm / 11mm) → detects shaft surface displacement via eddy-current effect
- Extension Cable → transmits raw oscillator/demodulator signal to field junction box
- 990-05-XX-03-01 Transmitter → conditions and converts signal to calibrated 4–20 mA output
- PLC / DCS Analog Input Card → receives 4–20 mA for alarming, trending, and protection logic
- SCADA / Historian → logs vibration data for long-term reliability analysis
This architecture ensures full galvanic isolation between the field sensor and the control system, protecting both the transmitter and the DCS from ground loops and transient overvoltages.
Sourcing & Quality Verification
- Authentic OEM Hardware – All units sourced from authorized distribution channels or verified surplus with full traceability documentation
- Pre-Shipment Inspection – Each module undergoes visual inspection, label verification (part number, MOD code, serial number), and functional continuity check before dispatch
- Serialized Traceability – Unit serial numbers recorded at point of sale; available for customer audit upon request
- Packaging – Anti-static ESD bag + foam-lined carton; meets IPC/JEDEC J-STD-033 handling requirements
- Warranty – 12-month warranty against manufacturing defects; DOA replacement within 7 business days
Procurement Process
- Submit RFQ – Contact support@konmask.com with your required quantity, delivery timeline, and destination port
- Receive Quotation – Formal quotation with unit price (HKD/USD), lead time, and Incoterms issued within 1 business day
- Order Confirmation – Purchase order accepted via email; proforma invoice issued for payment processing
- Payment – T/T (bank transfer), PayPal, or credit card accepted; escrow available for large orders
- Shipment – DHL / FedEx / UPS express with full tracking; EXW Xiamen or CIF destination available
- Documentation – Commercial invoice, packing list, certificate of origin, and test report provided with every shipment
Technical FAQ
Q: Is the 990-05-XX-03-01 compatible with non-Bently Nevada proximity probes?
A: The module is optimized for Bently Nevada 3300 Series probes. Compatibility with third-party probes depends on oscillator frequency and gap voltage range — contact our engineers for a compatibility assessment before ordering.
Q: What does the MOD:168251-01 designation indicate?
A: The MOD (modification) code identifies a specific factory configuration or hardware revision applied to the base 990-05-XX-03-01 design. Always specify the full part number including MOD code when ordering to ensure exact form-fit-function replacement.
Q: Can this transmitter be used in SIL 2 safety loops?
A: The 990 Series transmitter is used in machinery protection applications. For SIL-rated safety instrumented functions, consult the Bently Nevada 3500 Series platform and verify SIL certification documentation with your functional safety engineer.
Q: What is the output range and what vibration level does 20 mA correspond to?
A: The 4–20 mA span corresponds to the configured vibration measurement range (e.g., 0–25 mil pp or 0–500 µm pp depending on probe gap and system calibration). Confirm the full-scale range with your system integrator or refer to the original system configuration record.
Q: Do you provide calibration certificates?
A: Calibration certificates from the OEM are available for new units. For surplus units, we provide inspection reports. Third-party NIST-traceable calibration can be arranged upon request at additional cost.
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