Bently Nevada 330800-28-20-057-03-02 – Proximity Transducer Assembly | 3300 XL Series Platform
Engineering Background: In high-speed rotating machinery — turbines, compressors, pumps, and generators — shaft vibration and position data are the first line of defense against catastrophic mechanical failure. When a proximity transducer fails or goes out of calibration, the entire condition monitoring chain is compromised: operators lose real-time shaft displacement readings, protection systems may trip on false signals or, worse, fail to trip on genuine faults. Unplanned downtime in these environments can cost tens of thousands of dollars per hour. The Bently Nevada 330800-28-20-057-03-02 Proximity Transducer Assembly is the precision sensing element that keeps this chain intact.
Product Positioning: The 330800-28-20-057-03-02 is a field-proven proximity transducer assembly within Bently Nevada’s 3300 XL Series — one of the most widely deployed eddy-current sensing platforms in global industrial machinery protection. Designed to work seamlessly with 3300 XL extension cables and signal conditioning drivers, this assembly delivers the sub-micron resolution and long-term stability demanded by API 670-compliant machinery protection systems. It is the preferred choice for OEM integrators, plant maintenance engineers, and MRO procurement teams worldwide.
Complete Technical Specifications
- Part Number / SKU: 330800-28-20-057-03-02
- Manufacturer: Bently Nevada (Baker Hughes)
- Series: 3300 XL Proximity Transducer System
- Sensing Technology: Eddy-Current (Non-contact)
- Probe Tip Diameter: 8 mm (standard 3300 XL)
- Cable Length (Probe): 0.5 m (as encoded in part number)
- Extension Cable Length: 5.0 m (as encoded in part number)
- Total System Length: 5.5 m nominal
- Target Material: AISI 4140 steel or equivalent (per Bently Nevada calibration standard)
- Linear Range: Approximately 0–2.0 mm (0–80 mil)
- Sensitivity: 7.87 V/mm (200 mV/mil) nominal
- Frequency Response: DC to 10,000 Hz
- Operating Temperature: –35°C to +177°C (probe); –35°C to +85°C (extension cable)
- Connector Type: 57 series (as encoded in part number)
- Armor / Jacket: SST armor, standard jacket (03-02 suffix)
- Compliance: API 670, CE
- Weight: Approx. 1,500 g (complete assembly)
Proven Application Environments
- Steam & Gas Turbines: Shaft radial vibration and axial position monitoring on HP/LP turbine stages
- Centrifugal Compressors: Real-time rotor displacement measurement in oil & gas processing trains
- Pumps & Fans: Continuous shaft orbit and eccentricity monitoring in critical utility systems
- Generators & Motors: Bearing journal vibration detection in power generation facilities
- Gearboxes: Gear mesh frequency analysis and shaft runout measurement
- Petrochemical & Refinery Plants: API 670-mandated machinery protection on rotating equipment trains
- LNG & Offshore Platforms: High-reliability sensing in harsh, corrosive environments
Engineering Advantages
- Non-Contact Measurement: Zero mechanical wear — no physical contact with the rotating shaft, ensuring indefinite sensor life under normal operating conditions
- High Frequency Response (DC–10 kHz): Captures both slow-roll runout and high-frequency vibration harmonics in a single channel
- Factory-Matched System: Probe, extension cable, and driver are calibrated as a matched set, eliminating field calibration errors
- SST Armor Construction: Stainless steel armor protects against mechanical damage, chemical exposure, and high-pressure wash-down environments
- API 670 Compliance: Meets the most stringent international standard for machinery protection instrumentation
- Direct Replacement Compatibility: Drop-in replacement for existing 3300 XL installations — no re-wiring or re-configuration required
- Wide Temperature Range: Suitable for both cryogenic and high-temperature process environments
System Architecture & Signal Flow
The 330800-28-20-057-03-02 operates as part of a three-component eddy-current system:
- Proximity Probe (330800 series): Generates a high-frequency electromagnetic field. When a conductive target (shaft) enters the field, eddy currents are induced, altering the probe’s impedance.
- Extension Cable: Transmits the impedance-modulated signal from the probe (mounted at the bearing) to the driver/oscillator, typically located in a junction box or instrument cabinet up to 5 m away.
- Driver / Oscillator-Demodulator (e.g., 3300 XL 8mm Driver): Converts the impedance change into a DC voltage output (–24 VDC bias, 200 mV/mil sensitivity) that feeds directly into Bently Nevada 3500 Series monitors or equivalent rack systems.
This matched-system architecture ensures the calibration curve remains within ±1% of nominal across the full operating temperature range — a critical requirement for API 670 alarm and trip setpoint accuracy.
Sourcing & Quality Verification
At Konmask.com, every Bently Nevada 330800-28-20-057-03-02 unit undergoes a structured incoming quality process before dispatch:
- Part number and date code verification against manufacturer documentation
- Physical inspection: connector integrity, armor condition, cable continuity
- Impedance and sensitivity spot-check using calibrated reference equipment
- Secure anti-static packaging with tamper-evident sealing
- Full traceability documentation available on request
We source from authorized distribution channels and verified surplus inventories. Counterfeit or refurbished units are never knowingly stocked or shipped.
Procurement Process
- Submit Inquiry: Email [email protected] or use the on-page inquiry form with your required quantity and delivery timeline.
- Receive Quotation: Our technical sales team responds within 1 business day with pricing, lead time, and stock confirmation.
- Order Confirmation: Confirm PO details; we issue a proforma invoice and arrange payment via T/T, L/C, or agreed terms.
- Quality Inspection & Dispatch: Units are inspected, packaged, and shipped via DHL / FedEx / UPS with full tracking.
- After-Sales Support: Technical assistance available post-delivery for installation verification and system commissioning queries.
Technical FAQ
- Q: Is the 330800-28-20-057-03-02 compatible with the Bently Nevada 3500 monitoring rack?
- A: Yes. When paired with the appropriate 3300 XL 8mm driver, the output signal (–24 VDC bias, 200 mV/mil) is fully compatible with all 3500 Series monitor cards configured for proximity inputs.
- Q: Can this transducer be used with a non-Bently Nevada driver?
- A: It is strongly recommended to use matched Bently Nevada drivers. Third-party drivers may alter the calibration curve and void API 670 compliance. Consult our engineers before substituting drivers.
- Q: What is the maximum shaft speed this transducer can monitor?
- A: The DC–10,000 Hz frequency response supports shaft speeds well beyond 100,000 RPM for vibration measurement. For specific high-speed applications, contact our technical team for application review.
- Q: How do I verify the transducer is functioning correctly after installation?
- A: With the driver powered, measure the DC bias voltage at the driver output. A reading of approximately –10 VDC at mid-gap (1.0 mm) confirms correct operation. Refer to the Bently Nevada System 1 calibration procedure for full verification.
- Q: What is the lead time for this part?
- A: Lead time depends on current stock levels. In-stock units typically ship within 3–5 business days. Contact us for real-time availability.
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