Bently Nevada 33105-02-12-05-02-00 – Reverse Mount Eddy Current Probe | 3300 Series Vibration Monitoring Platform
Engineering Background
The Bently Nevada 3300 Series represents the industry benchmark for continuous machinery protection in rotating equipment applications. Developed by Baker Hughes (Bently Nevada), this platform has been deployed across power generation, oil & gas, petrochemical, and heavy industrial facilities worldwide for over four decades. The 33105 probe series is the reverse-mount variant engineered for installations where standard front-mount access is mechanically constrained.
Product Positioning
The 33105-02-12-05-02-00 is a precision eddy current proximity probe designed for radial shaft vibration measurement and axial position monitoring in critical rotating machinery. Its reverse-mount configuration allows installation from the non-drive end of bearing housings, making it the preferred solution for turbines, compressors, pumps, and gearboxes where conventional probe access is restricted. This unit is fully compatible with the Bently Nevada 3300 XL 8mm proximity transducer system and integrates directly with 3500 Series rack-based monitoring systems.
Complete Technical Specifications
| Part Number | 33105-02-12-05-02-00 |
| Brand | Bently Nevada (Baker Hughes) |
| Series | 3300 XL 8mm Proximity Transducer System |
| Probe Type | Reverse Mount Eddy Current Proximity Probe |
| Sensing Technology | Eddy Current (Non-contact) |
| Probe Diameter | 8 mm |
| Cable Length | 0.5 m (integral cable) |
| Extension Cable | Compatible with 3300 XL extension cables |
| Linear Range | 0.25 mm – 2.25 mm (nominal) |
| Scale Factor | 7.87 V/mm (200 mV/mil) |
| Frequency Response | DC to 10,000 Hz (–3 dB) |
| Temperature Range (Operating) | –35°C to +177°C (–31°F to +351°F) |
| Target Material | AISI 4140 steel (standard); consult factory for other alloys |
| Connector Type | Reverse mount, integral armored cable |
| Housing Material | Stainless steel |
| Weight | Approx. 230 g |
| Approvals / Certifications | CE; compatible with ATEX/IECEx installations (verify with driver) |
| Compatible Driver / Oscillator | Bently Nevada 3300 XL Driver (e.g., 330180, 330185) |
| Compatible Monitor | Bently Nevada 3500 Series Rack |
Proven Application Environments
- Steam & Gas Turbines – Radial vibration and thrust position monitoring on HP/LP stages
- Centrifugal Compressors – Shaft orbit and differential expansion measurement in process gas trains
- Boiler Feed Pumps – Continuous bearing proximity monitoring in high-temperature environments
- Gearboxes & Expanders – Non-contact displacement sensing where physical access is limited
- Hydro Turbines – Axial position and radial vibration in vertical shaft machines
- Petrochemical Rotating Equipment – API 670-compliant machinery protection systems
Engineering Advantages
- Reverse-Mount Design – Enables probe installation from the back of the bearing housing, eliminating the need for front-access machining or disassembly
- Non-Contact Measurement – Zero mechanical wear; continuous operation without physical contact with the rotating shaft
- Wide Temperature Tolerance – Rated to +177°C, suitable for high-temperature turbine and compressor environments
- High Frequency Response – DC to 10 kHz bandwidth captures sub-synchronous, synchronous, and high-frequency vibration events
- Direct System Integration – Plug-and-play compatibility with existing 3300 XL and 3500 Series infrastructure; no recalibration of the monitoring rack required
- Armored Cable Construction – Integral stainless steel armored cable resists mechanical damage, oil, and chemical exposure in harsh plant environments
System Architecture & Signal Flow
The 33105-02-12-05-02-00 operates as part of a three-component eddy current transducer system:
- Probe (33105-02-12-05-02-00) – Generates a high-frequency electromagnetic field; detects changes in gap distance to the conductive target (shaft)
- Extension Cable (3300 XL Series) – Transmits the RF signal from probe tip to driver/oscillator with matched impedance
- Driver / Oscillator (e.g., 330180) – Conditions the signal and outputs a DC voltage proportional to gap distance at 7.87 V/mm scale factor
The conditioned DC output feeds directly into a Bently Nevada 3500 Series monitor card for alarm, trip, and data acquisition functions. The system supports both radial vibration (dynamic AC component) and position (static DC component) measurements from a single probe installation.
Sourcing & Quality Verification
- All units sourced through verified industrial automation supply channels with full traceability
- Each probe inspected for physical integrity, connector condition, and cable armor continuity prior to dispatch
- Original manufacturer part number confirmed against Bently Nevada product catalog
- Packaging inspected for evidence of improper storage or transit damage
- Certificate of conformance available upon request for critical plant applications
Procurement Process
- Confirm Compatibility – Verify your existing driver model (330180 / 330185 / 330130) and extension cable length against your installation drawing
- Submit Inquiry or Order – Place order directly on Konmask.com or contact our engineering team for volume pricing and lead time confirmation
- Order Confirmation – Receive order acknowledgment with estimated dispatch date within 1 business day
- Dispatch & Tracking – Units shipped with full tracking; express freight available for urgent plant shutdowns
- Technical Support – Post-delivery installation and commissioning support available via email or phone
Technical FAQ
Q: Is the 33105-02-12-05-02-00 interchangeable with the 330105 standard probe?
A: No. The 33105 reverse-mount series uses a different mechanical interface and cable exit direction. Confirm your bearing housing drawing before substituting probe types.
Q: What driver is required for this probe?
A: This probe is designed for use with Bently Nevada 3300 XL drivers (e.g., 330180-90-05, 330185-90-05). Verify the driver part number suffix matches your system’s power supply and output configuration.
Q: Can this probe be used with non-Bently Nevada monitors?
A: The probe outputs a standard eddy current signal, but scale factor and impedance matching must be verified. Bently Nevada recommends using matched system components for API 670-compliant installations.
Q: What is the recommended gap setting?
A: The nominal installation gap is 1.0 mm (40 mil), placing the probe in the center of its linear range. Verify with your system’s calibration documentation.
Q: Is a calibration certificate included?
A: A certificate of conformance is available upon request. Factory calibration certificates can be arranged for new OEM units; contact our team prior to ordering.
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