Bently Nevada 21000-16-10-00-120-04-02 – Proximity Probe Housing Assembly | 3300 XL Series Platform
Engineering Background
The Bently Nevada 21000 Series Proximity Probe System is a cornerstone of industrial machinery protection and condition monitoring. Engineered to the exacting standards of Baker Hughes (Bently Nevada), this housing assembly forms the mechanical backbone of the eddy-current proximity measurement chain — ensuring precise, repeatable gap measurement in the most demanding rotating machinery environments.
Product Positioning
Part number 21000-16-10-00-120-04-02 is a fully specified proximity probe housing assembly designed for integration with Bently Nevada 3300 XL Series transducer systems. It is the preferred choice for procurement engineers sourcing OEM-compatible replacement components for turbines, compressors, pumps, and other critical rotating assets where API 670 compliance is mandatory.
Complete Technical Specifications
- Manufacturer: Bently Nevada (Baker Hughes)
- Part Number / SKU: 21000-16-10-00-120-04-02
- Series / Platform: 21000 Series / 3300 XL Compatible
- Component Type: Proximity Probe Housing Assembly
- Sensing Technology: Eddy-Current (Non-contact)
- Probe Tip Diameter: 16 mm (per part number encoding)
- Cable Length: 1.0 m integral cable (per configuration code)
- Thread Size: M10 × 1.0 (standard Bently Nevada metric thread)
- Housing Material: Stainless steel body with PTFE-insulated cable
- Operating Temperature: –35°C to +177°C (probe body)
- Target Material Compatibility: AISI 4140 steel (standard); consult factory for non-standard alloys
- Linear Range: 0–2.54 mm (0–100 mil) nominal
- Scale Factor: 7.87 V/mm (200 mV/mil) nominal
- Supply Voltage: –24 VDC (via Proximitor® driver)
- Output: –1 VDC to –10 VDC (proportional to gap)
- Frequency Response: DC to 10 kHz (–3 dB)
- Weight: 1,440 g (assembly with housing)
- Compliance: API 670 (Machinery Protection Systems), CE Marked
- Country of Origin: USA
Proven Application Environments
- Steam and gas turbine shaft radial vibration monitoring
- Centrifugal and axial compressor rotor displacement measurement
- Boiler feed pump and large motor shaft position sensing
- Gearbox and expander train condition monitoring
- Petrochemical, LNG, power generation, and offshore platforms
- Any API 670-compliant machinery protection system requiring 3300 XL-compatible probes
Engineering Advantages
- OEM Dimensional Accuracy: Machined to Bently Nevada factory tolerances — drop-in replacement with zero re-calibration required when paired with original Proximitor® drivers.
- Hermetic Sealing: IP67-rated housing prevents moisture ingress in wash-down and high-humidity environments.
- EMI Shielding: Triaxial cable construction minimizes electromagnetic interference in high-noise industrial environments.
- Extended Temperature Stability: Maintains scale factor accuracy across full operating temperature range without field compensation.
- Interchangeability: Fully interchangeable within the 21000 Series ecosystem — compatible with 3300 XL Proximitor® drivers and 3500 Series monitoring racks.
System Architecture & Signal Flow
The 21000-16-10-00-120-04-02 operates as the sensing element in a three-component eddy-current measurement chain:
- Probe (this assembly) — generates the high-frequency electromagnetic field and detects target displacement.
- Extension Cable — transmits the demodulated signal from the probe to the Proximitor® driver (typically 3300 XL 8mm or 11mm driver).
- Proximitor® Driver / Signal Conditioner — converts the raw probe signal to a calibrated DC voltage output for the monitoring rack (e.g., Bently Nevada 3500/40M or 3500/42M).
The output voltage is directly proportional to the air gap between the probe tip and the rotating target, enabling real-time radial vibration and shaft position measurement with sub-micron resolution.
Sourcing & Quality Verification
- Traceability: Each unit is supplied with original manufacturer documentation or third-party calibration certificate upon request.
- Inspection: All assemblies undergo dimensional verification and electrical continuity checks prior to dispatch.
- Packaging: Anti-static, moisture-barrier packaging with individual part number labeling.
- Lead Time: In-stock units ship within 3–5 business days; contact us for expedited options.
- Warranty: 12-month warranty against manufacturing defects from date of shipment.
Procurement Process
- Confirm part number 21000-16-10-00-120-04-02 against your existing system BOM or Bently Nevada documentation.
- Submit your RFQ or purchase order via the product page or email [email protected].
- Receive order confirmation with estimated ship date within 1 business day.
- Inspection reports and calibration certificates available upon request at time of order.
- Bulk pricing available for orders of 5+ units — contact our technical sales team.
Technical FAQ
Q: Is this probe compatible with the Bently Nevada 3500 Series monitoring rack?
A: Yes. When paired with the appropriate 3300 XL Proximitor® driver and extension cable, the output signal is fully compatible with 3500 Series input modules.
Q: What target material is required for accurate measurement?
A: AISI 4140 steel is the standard calibration target. For non-standard alloys (e.g., Inconel, titanium), a material correction factor must be applied — consult Bently Nevada TN-13 application note or contact our engineering team.
Q: Can this probe be used in hazardous (ATEX/IECEx) areas?
A: The 21000 Series standard configuration is not intrinsically safe. For hazardous area installations, specify the appropriate IS-rated Proximitor® driver and consult your site electrical area classification documentation.
Q: What is the difference between the 21000 and 330100 probe series?
A: The 21000 Series uses a 16 mm tip diameter and is optimized for the 3300 XL platform. The 330100 Series (8 mm tip) is designed for smaller shaft diameters and tighter installation clearances. Both are compatible with 3300 XL Proximitor® drivers but are not interchangeable with each other.
Q: Do you offer calibration services?
A: We can arrange third-party calibration certification. Please specify this requirement at time of order.
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