Vibration Monitoring Solution – Bently Nevada 21000-28-05-00-041-03-02 | 3300 Series Proximity Probe Housing Assembly
Where This Product Is Used
The Bently Nevada 21000-28-05-00-041-03-02 Proximity Probe Housing Assembly is engineered for continuous, non-contact vibration and position measurement in rotating machinery. Typical deployment environments include:
- Steam & Gas Turbines – Shaft radial vibration monitoring on high-speed turbine trains in power generation plants
- Centrifugal Compressors – Rotor dynamic monitoring in petrochemical and LNG compression trains
- Pumps & Fans – Bearing housing proximity sensing in critical process pumps (API 670 compliant installations)
- Gearboxes – Gear mesh frequency and shaft orbit analysis in heavy industrial gearboxes
- Marine Propulsion Systems – Shaft monitoring on vessel propulsion shafting and auxiliary machinery
- Paper & Steel Mills – Roll and spindle position feedback in continuous process lines
Wherever API 670 machinery protection is mandated, this housing assembly provides the mechanical interface that keeps the probe tip precisely positioned relative to the target shaft.
Technical Specifications
| Part Number | 21000-28-05-00-041-03-02 |
| Brand | Bently Nevada (Baker Hughes) |
| Series | 3300 XL / 21000 Proximity Probe System |
| Product Type | Proximity Probe Housing Assembly |
| Probe Tip Diameter | 8 mm (standard) |
| Cable Length | 5 m (integral cable) |
| Thread Size | M10 × 1 (metric) |
| Temperature Range | –40 °C to +177 °C |
| Target Material | AISI 4140 / 4340 steel (ferromagnetic) |
| Output Signal | –24 VDC nominal (used with 3300 XL driver) |
| Sensitivity | 7.87 V/mm (200 mV/mil) |
| Linear Range | 0.25 mm – 2.54 mm (10–100 mil) |
| Approvals | FM, CSA, ATEX, IECEx |
| Weight | Approx. 60 g |
Why Engineers Specify This Model
- Exact OEM Replacement – Drop-in fit for existing 3300 XL and 21000-series installations; no re-calibration of the driver required when replacing like-for-like
- Integral Cable Design – Factory-terminated 5 m cable eliminates field-splice points, reducing signal noise and connector failure risk in high-vibration environments
- Wide Temperature Tolerance – Rated to 177 °C continuous, suitable for hot-section turbine bearing pedestals without derating
- Hazardous Area Certified – FM/CSA/ATEX/IECEx approvals allow installation in Zone 1/Division 1 classified areas without additional barriers in most configurations
- API 670 Compliance – Meets the mechanical protection standard required by most EPC contractors and end-user machinery protection specifications
- Proven Field Reliability – Bently Nevada 3300-series probes are the de facto standard in turbomachinery protection globally, with decades of installed base
Complete System Bill of Materials
For a fully functional proximity measurement channel, the following components are typically required alongside this housing assembly:
- Proximitor / Signal Conditioner: Bently Nevada 3300 XL 8 mm Proximitor (e.g., 330180-91-05)
- Extension Cable: Bently Nevada 330130-series (length to suit installation)
- Monitor Card: Bently Nevada 3500/42M Proximitor / Seismic Monitor or equivalent
- Mounting Hardware: Stainless steel locknut and jam nut (M10 × 1), anti-vibration compound
- Barrier (if required): Zener barrier or galvanic isolator per area classification
Compliance & Industry Standards
- API 670 – Machinery Protection Systems (5th Edition)
- IEC 60079 – Explosive Atmospheres (ATEX / IECEx)
- FM 3610 / CSA C22.2 No. 157 – Intrinsic Safety
- ISO 10816 / ISO 20816 – Mechanical Vibration – Evaluation of Machine Vibration
- NEMA 4X – Enclosure rating for connector/housing interface
Quality Assurance & Sourcing
Konmask.com sources Bently Nevada components through established industrial distribution channels. Each unit undergoes the following before dispatch:
- Visual inspection for housing integrity, cable jacket condition, and connector seating
- Part number label verification against order documentation
- Packaging in anti-static, moisture-barrier material with desiccant
- Certificate of conformance (CoC) available upon request
We stock both new-surplus and factory-new inventory. Condition is clearly stated on each listing. Refurbished or repaired units are never sold without explicit disclosure.
How to Source This Part
- In Stock Orders – Add to cart and check out. Most orders ship within 1–3 business days from our warehouse.
- Bulk / Project Quantities – Contact us for volume pricing and lead-time commitment on multi-unit project orders.
- Urgent Shutdown Requirements – Email support@konmask.com or call +0086 19859288691 for expedited handling.
- Cross-Reference / Interchange – If you are unsure whether this part number matches your installation, send us your existing probe tag number or datasheet and our engineers will confirm compatibility.
Application-Specific FAQ
Q: Can this probe be used with a 3500-series monitor directly?
A: Yes. The 21000-series probe is fully compatible with 3500-series Proximitor monitors when paired with the correct 3300 XL Proximitor signal conditioner. The monitor card reads the conditioned –24 VDC output signal.
Q: What is the maximum shaft speed this probe can monitor?
A: The 3300 XL 8 mm system has a frequency response flat to 10 kHz, making it suitable for shaft speeds up to approximately 600,000 RPM in theory; practical installations typically cover up to 60,000 RPM for turbomachinery applications.
Q: Is this probe suitable for non-ferromagnetic targets (e.g., titanium or Inconel shafts)?
A: Standard eddy-current probes require ferromagnetic or conductive targets. For non-standard target materials, a calibration correction factor must be applied. Contact Bently Nevada or our technical team for target-specific sensitivity data.
Q: What is the difference between the 21000 and 330100 probe series?
A: The 21000 series uses a metric M10 thread and is common in international (non-North American) installations. The 330100 series uses a 3/8-24 UNF thread standard in North American installations. Both are electrically compatible with the 3300 XL Proximitor.
Q: Do you provide installation and commissioning support?
A: We provide technical documentation and remote guidance. For on-site commissioning, we can recommend certified Bently Nevada service partners in your region.
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Contact: support@konmask.com | +0086 19859288691
