Bently Nevada 21504-04-36-05-02 – High-Precision Eddy Current Proximity Probe | 3300 XL Series Platform
Engineering Background: The Bently Nevada 21504-04-36-05-02 is a factory-calibrated eddy current proximity probe engineered for continuous, non-contact measurement of shaft radial vibration, axial position, and differential expansion in rotating machinery. It is a core sensing element within the Bently Nevada 3300 XL monitoring ecosystem — the industry benchmark for turbomachinery protection systems in power generation, oil & gas, and petrochemical plants.
Product Positioning: Designed for procurement engineers and reliability teams requiring OEM-grade sensing accuracy with full system compatibility. The 21504-04-36-05-02 integrates directly with 3300 XL proximitor/seismic monitors, delivering API 670-compliant vibration data without signal conditioning modifications. Konmask.com supplies this probe from verified industrial channels with full traceability documentation available on request.
Complete Technical Specifications
- Part Number / SKU: 21504-04-36-05-02
- Manufacturer: Bently Nevada (Baker Hughes)
- Series / Platform: 3300 XL Proximity Transducer System
- Sensor Type: Eddy Current (Non-Contact) Proximity Probe
- Probe Tip Diameter: 5 mm (standard)
- Cable Length (Integral): 36 inches (approx. 914 mm)
- Extension Cable Length: 05 ft (approx. 1.5 m)
- Connector Type: Standard coaxial per 3300 XL system spec
- Measurement Range: 0 – 90 mil pp (0 – 2.286 mm pp) linear range
- Scale Factor: 200 mV/mil (7.87 V/mm) nominal
- Operating Temperature: –30°C to +177°C (probe body)
- Target Material: AISI 4140 steel or equivalent
- Supply Voltage: –24 VDC (via proximitor/monitor)
- Output Signal: DC voltage proportional to gap distance
- Frequency Response: DC to 10,000 Hz (–3 dB)
- Ingress Protection: IP67 (probe body)
- Compliance: API 670 5th Edition, CE, RoHS
- Weight: Approx. 50 g (probe assembly)
Proven Application Environments
- Steam and gas turbine shaft radial vibration monitoring
- Centrifugal compressor rotor position and axial thrust measurement
- Pump and motor bearing journal orbit analysis
- Gearbox differential expansion monitoring
- Expander/generator train protection systems
- Refinery and LNG plant rotating equipment health monitoring
- Power plant turbine supervisory instrumentation (TSI) panels
Engineering Advantages
- Non-contact measurement: Zero mechanical wear, suitable for continuous 24/7 operation
- Factory calibration: Each probe individually calibrated against NIST-traceable standards
- 3300 XL system compatibility: Plug-and-play replacement with no re-ranging required
- High-temperature tolerance: Rated to 177°C for hot-section turbine installations
- API 670 compliance: Meets international machinery protection standard for critical rotating equipment
- Robust construction: Stainless steel probe body with hermetically sealed tip for harsh environments
System Architecture & Signal Flow
The 21504-04-36-05-02 operates as part of a three-component transducer system:
- Probe (21504-04-36-05-02): Generates an eddy current field at the tip; gap change modulates the oscillator circuit.
- Extension Cable: Transmits the modulated RF signal from probe to proximitor (length matched to system calibration).
- Proximitor/Monitor (3300 XL series): Demodulates the signal and outputs a DC voltage proportional to shaft gap — fed to the protection/monitoring system.
Total system cable length (probe integral cable + extension cable) must match the calibrated length specified in the part number to maintain scale factor accuracy. Do not substitute cable lengths without recalibration.
Sourcing & Quality Verification
- Sourced from authorized industrial distributors and verified OEM surplus channels
- Each unit inspected for physical integrity, connector condition, and label authenticity prior to shipment
- Calibration certificates and material traceability documentation available upon request
- Serialized units traceable to Bently Nevada manufacturing records where applicable
- Packaging inspected for tamper evidence; counterfeit-risk assessment performed per internal QC protocol
Procurement Process
- Confirm part number 21504-04-36-05-02 matches your system cable length and connector requirements
- Verify target material compatibility (AISI 4140 or equivalent) with your shaft specification
- Submit purchase order or inquiry to [email protected]
- Receive proforma invoice with lead time and shipping options (DHL / FedEx international available)
- Payment via T/T, PayPal, or trade assurance; export documentation provided for customs clearance
- Shipment with full packing list, commercial invoice, and optional third-party inspection report
Technical FAQ
Q: Can this probe replace an existing 21504-04-36-05-02 in a 3300 XL system without recalibration?
A: Yes — identical part number means identical cable length and calibration. Direct drop-in replacement; no re-ranging required.
Q: What is the maximum shaft speed this probe can monitor?
A: The 10,000 Hz frequency response supports shaft speeds well beyond typical turbomachinery operating ranges for 1× vibration detection.
Q: Is this probe compatible with non-Bently Nevada monitors?
A: The probe outputs a standard eddy current signal, but scale factor is calibrated for the 3300 XL proximitor. Third-party monitor compatibility requires verification of input impedance and supply voltage.
Q: Do you provide export documentation for international shipments?
A: Yes. Commercial invoice, packing list, certificate of origin, and third-party inspection reports available for customs compliance.
Q: What is the lead time for this part?
A: Typically 3–7 business days for in-stock units. Contact us for current availability and expedited shipping options.
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