Bently Nevada 21000-28-05-00-080-03-02 – Precision Probe Housing for Rotating Machinery | 3300 XL Eddy Current System
In high-speed rotating machinery, the mechanical interface between a proximity probe and the machine casing is as critical as the sensor itself. The Bently Nevada 21000-28-05-00-080-03-02 Proximity Probe Housing Assembly provides the rigid, thermally stable, and vibration-resistant mounting structure that ensures your eddy current probe maintains exact gap geometry under all operating conditions — from cold commissioning to full-load thermal expansion.
Designed as an integral component of the Bently Nevada 3300 XL Series continuous vibration monitoring platform, this housing assembly is specified by rotating machinery engineers at power generation facilities, petrochemical plants, and compressor stations worldwide. It eliminates probe drift caused by mechanical looseness, thermal cycling, and process vibration — the three most common sources of false alarms and missed fault detection in turbomachinery protection systems.
Complete Technical Specifications
- Part Number: 21000-28-05-00-080-03-02
- Manufacturer: Bently Nevada (Baker Hughes)
- Series: 3300 XL Eddy Current Proximity System
- Assembly Type: Proximity Probe Housing Assembly
- Probe Thread Size: Compatible with standard 3300 XL probe thread specifications
- Mounting Configuration: Radial / Axial (application-dependent)
- Material: Stainless steel body with corrosion-resistant finish
- Temperature Range: Suitable for industrial process environments (refer to system datasheet for limits)
- Weight: Approx. 1,100 g (complete assembly)
- Compatibility: Bently Nevada 3300 XL proximity probes and extension cables
- Certifications: Manufactured to API 670 5th Edition mechanical interface standards
Proven Application Environments
- Steam Turbines: Shaft radial vibration and axial position monitoring on HP/IP/LP stages; housing maintains probe gap stability through thermal transients from cold start to rated speed
- Gas Turbines & Compressors: Continuous monitoring of journal bearing vibration in centrifugal and axial compressors; housing resists process gas pressure and temperature fluctuations
- Pumps & Fans: Radial vibration measurement on large BFW pumps and induced-draft fans in power plant auxiliary systems
- Gearboxes: Differential expansion and eccentricity monitoring on high-speed gear stages
- Hydro Turbines: Shaft runout and guide bearing monitoring in hydroelectric generating units
- Marine Propulsion: Shaft monitoring on diesel-electric and gas turbine marine drives
Engineering Advantages
- Dimensional Stability: Precision-machined housing maintains probe tip-to-target gap within ±0.001″ across the full operating temperature range, eliminating thermally induced false alarms
- Vibration Immunity: Rigid stainless steel construction prevents probe resonance that can corrupt vibration signals at high shaft speeds
- Sealed Design: Protects probe body and cable connection from process fluid ingress, condensation, and particulate contamination
- Tool-Free Gap Adjustment: Threaded probe body interface allows precise gap setting during commissioning without special tooling
- OEM Interchangeability: Direct drop-in replacement for existing 3300 XL installations — no re-cabling or re-calibration required
- Long Service Life: Corrosion-resistant materials rated for continuous operation in H₂S, steam, and hydrocarbon environments
System Architecture & Signal Flow
The 21000-28-05-00-080-03-02 housing assembly occupies the critical mechanical interface layer in the Bently Nevada 3300 XL signal chain:
- Target (Shaft): Rotating conductive surface (typically 4140 steel or Inconel)
- Probe Housing (this part): Mechanically fixes probe tip position relative to shaft centerline; provides environmental sealing and cable strain relief
- 3300 XL Proximity Probe: Generates eddy current field; outputs –200 mV/mil (–7.87 V/mm) linear voltage signal
- Extension Cable: Transmits signal from probe to proximitor; matched system impedance
- Proximitor / Oscillator-Demodulator: Conditions signal; outputs DC voltage proportional to gap distance
- 3500 / 3300 Monitor: Processes vibration, position, and speed data; triggers alarms and trips
Mechanical integrity of the housing is the foundation of system accuracy. A loose or misaligned housing introduces a static offset error that propagates through the entire signal chain and cannot be corrected by software calibration.
Sourcing & Quality Verification
- OEM Traceability: All units sourced with full manufacturer documentation and part number verification
- Incoming Inspection: 100% dimensional check on probe thread, housing bore, and mounting face perpendicularity
- Functional Test: Verified compatible with 3300 XL probe and proximitor prior to shipment
- Packaging: Anti-static, moisture-barrier packaging with individual part number labeling
- Shelf Life: Stored in climate-controlled warehouse; no shelf-life limitations for mechanical assemblies
- Documentation: Certificate of conformance and packing list included with every shipment
Procurement Process
- Step 1 – Confirm Compatibility: Verify your existing probe model and housing thread specification against part number 21000-28-05-00-080-03-02
- Step 2 – Request Quote: Contact support@konmask.com with your PO number, required quantity, and delivery location
- Step 3 – Lead Time: In-stock units ship within 2–5 business days; expedited shipping available for critical plant outages
- Step 4 – Customs & Export: We handle export documentation, HS code classification, and ECCN compliance for international shipments
- Step 5 – After-Sales Support: Technical support available for installation, gap setting, and system integration questions
Technical FAQ
Q: Is this housing compatible with both radial and axial probe orientations?
A: The 21000-28-05-00-080-03-02 is designed for specific mounting configurations. Confirm your machine drawing and probe orientation before ordering. Contact us if you need application-specific guidance.
Q: Can I use a non-Bently Nevada probe in this housing?
A: Not recommended. The 3300 XL system is a matched-impedance system. Using third-party probes in OEM housings will invalidate calibration and may trigger nuisance trips or missed fault detection.
Q: What is the recommended gap setting for this housing?
A: Standard gap for 3300 XL 8 mm probes is 1.0 mm (–10.0 VDC). Refer to Bently Nevada Installation Manual 141536-01 for your specific probe model and target material correction factors.
Q: Do you supply the complete probe system (probe + cable + proximitor)?
A: Yes. Konmask.com stocks complete 3300 XL system assemblies. Contact us with your system BOM for a consolidated quote.
Q: What is your return policy for this part?
A: Unused parts in original packaging may be returned within 30 days. Custom-configured or installed assemblies are non-returnable. See our full returns policy at Konmask.com.
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