Product Core Brief
- Full Model: 330105-02-12-10-02-05 (User input written as 33010502-12-10-02-05, hyphen omitted typo)
- Brand: Bently Nevada (Baker Hughes)
- Series: 3300 XL 8mm Standard Eddy-Current Transducer System, Reverse Mount Series
- Complete Suffix Decode (330105-AA-BB-CC-DD-EE):
- 330105 = Base probe, Reverse Mount (backward installation), 3/8-24 UNF American thread, non-armored cable
-02= Unthreaded tip segment length: 0.2 inch-12= Full stainless steel probe casing length: 1.2 inch; cable with patented FluidLoc oil-sealed molding-10= Factory integrated probe cable total length: 1.0 meter-02= Miniature ClickLoc gold-plated locking coaxial connector, standard protective sleeve-05= Full multi hazardous-area certifications: ATEX, IECEx, CSA; SIL 2 functional safety rating
- Core Function: Non-contact eddy-current reverse mount proximity probe, installed from the back of bearing housing counterbores to measure radial shaft vibration, axial thrust displacement, and Keyphasor rotational speed signals on gas/steam turbines, centrifugal compressors and critical fluid-film bearing rotating machinery
- Product Type: One-piece factory integrated probe + signal cable assembly
- Key Specs: 8mm linear system, 7.87 V/mm (200 mV/mil) sensitivity | FluidLoc anti-oil-wicking cable joint | 1m non-armored FEP cable | Multi global hazardous location approvals
- Condition: New Original (New Surplus), active OEM power generation spare, no formal obsolescence schedule
Key Technical Specifications
| Parameter | Defined Value |
|---|---|
| Mounting Thread | 3/8-24 UNF standard American fine thread, reverse mount rear installation design |
| Unthreaded Tip Length | 0.2 inch (5.08 mm) smooth sensing tip segment |
| Probe Stainless Steel Case Length | 1.2 inch (30.48 mm) compact housing for shallow counterbore mounting |
| Factory Integrated Cable Length | 1.0 m total matched triaxial coaxial cable |
| Cable Construction | 50Ω triaxial low capacitance 69.9 pF/m, FEP high-temperature oil-resistant outer jacket |
| Sealing Tech | FluidLoc molded cable-probe joint, blocks lube oil/process liquid wicking into internal conductors |
| Connector Hardware | Mini ClickLoc tool-free finger-lock gold-plated coaxial male connector |
| Linear Measurement Range | 0.25 mm ~ 2.3 mm full linear span; recommended installation gap 1.27 mm (50 mil) mid-range |
| Standard System Sensitivity | 7.87 V/mm (200 mV/mil) linear gap voltage output when matched with 3300 XL 8mm Proximitor sensor |
| Minimum Target Diameter | 15.2 mm flat metallic target surface; minimum shaft diameter 50.8 mm |
| Operating Temperature | Probe tip: −51°C ~ +177°C continuous; cable: −45°C ~ +100°C continuous |
| Mechanical Bend Limit | Static cable minimum bend radius 25.4 mm, dynamic routing ≥50.8 mm |
| Tensile Pull Strength | Max 330 N (75 lbf) axial pull without joint separation |
| Compliance & Certifications | API 670 4th Edition, CE EMC Class A, SIL 2, ATEX/IECEx Zone 2, CSA Class I Div 2 hazardous location approvals (suffix 05) |
| Compatible System Hardware | Exclusively matched with 3300 XL 8mm Proximitor signal conditioners; fully interoperable with all 3500 series TSI monitor rack modules (3500/42M, 3500/50) |
| Mechanical Form | Non-armored flexible outer cable jacket (no stainless steel braided armor) |
Product Introduction
This reverse mount 8mm proximity probe solves installation limitations for bearing housings with only rear-side counterbores, eliminating front-side mechanical interference with shaft and seal assemblies. The FluidLoc molded cable joint prevents turbine lubrication oil penetration, a primary failure mode for generic aftermarket probes that causes slow measurement drift under thermal load cycles.
Suffix -05 multi-certification variant meets global refinery, LNG, chemical plant hazardous area safety standards, suitable for SIL2 safety instrumented protection loops. The unit cannot operate standalone; a complete measurement stack requires: reverse mount probe + optional extension cable + dedicated 3300 XL 8mm Proximitor sensor, wired to 3500 TSI monitor racks.
Critical distinction vs standard forward mount probes (330101/330102): 330105 series is dedicated to rear counterbore reverse installation, with optimized tip geometry for recessed bearing housing mounting; electrical 50Ω triaxial matching is fully interchangeable with standard 8mm 3300 XL systems.
Firmware/Software Versions & Upgrade Notes
This probe is a passive analog sensing assembly with no onboard firmware. System compatibility rules apply to paired Proximitor and 3500 rack monitors:Minimum compatible 3500 monitor firmware: Revision G; minimum Rack Configuration Software v2.00. All M-series monitor modules must run unified matching firmware revisions to correctly interpret the 8mm 200 mV/mil linear gap voltage characteristic curve.No probe-specific software configuration required after physical installation; only total combined length (1m probe + optional extension cable) must be entered into rack configuration software to lock transducer sensitivity calibration. Always verify total system length before commissioning to eliminate static measurement offset errors.
Frequently Asked Questions (FAQ)
- Is hot-disconnecting the probe connector safe while the 3500 rack remains energized?Proximitor and TSI rack monitors stay powered during connector removal. Unplugging this probe triggers persistent channel fault flags and full loss of vibration/thrust displacement data, but no permanent damage occurs to monitor analog input circuits. Fully re-seat the ClickLoc connector until the locking tab clicks to clear fault alarms.
- Is this part obsolescent, and are direct drop-in hardware upgrades available?This reverse mount probe remains an active OEM catalog spare with no formal end-of-life date. The mechanical upgrade variant is 330106-xx-xx-10-02-05 (M10 metric thread armored reverse mount), which adds stainless steel braided armor for abrasive cabinet routing; it shares identical electrical performance but thicker outer diameter requires modified cable gland hardware, so it is not zero-modification plug-and-play.
- Will transducer linearity or gap calibration data erase if the rack loses full power?All system sensitivity and total length calibration parameters store in non-volatile flash memory on the paired 3500 monitor module, not the probe assembly itself. Full rack power loss does not erase transducer configuration data; swapping this unit requires only physical reconnection with no software rework if total system length stays unchanged.
- What warranty terms separate New Surplus inventory from refurbished alternatives?New Surplus probe assemblies carry a 12-month functional warranty covering coil linearity, 50Ω triaxial impedance consistency, ClickLoc connector plating integrity, FluidLoc molded seal performance, and full hazardous area certification validity. Refurbished probes typically offer only 3–6 month limited coverage and carry hidden risks of cracked PPS tip insulation, worn connector locking tabs, and compromised liquid sealing that cause drifting vibration readings during turbine thermal cycles.
- Why does New Surplus pricing sit higher than generic used/refurbished marketplace listings?All New Surplus probe assemblies complete mandatory standardized QC validation: serial traceability cross-check against OEM production logs, full length impedance and capacitance bench testing, linearity sweep testing across full 2.3mm measurement range, tensile pull-load testing to validate FluidLoc joint adhesion, 1000-cycle connector lock durability testing, and sealed anti-static factory packaging with full certification documentation. Refurbished lots skip this multi-step electrical and mechanical validation workflow, introducing unplanned downtime risk for safety-critical turbine vibration and thrust position protection loops.
- Can this reverse mount probe mate with 11mm 330700 series Proximitor sensors?No, this 8mm probe uses 50Ω triaxial matching parameters exclusive to 3300 XL 8mm Proximitor hardware. 11mm probe systems use different capacitance matching; cross-mixing hardware breaks linearity and generates severe measurement offset errors. Verify against the OEM 3300 XL datasheet before mixing transducer hardware to avoid permanent Proximitor input circuit damage.
- Does the probe locally store vibration waveforms or long-term rotor position trending logs?No, the assembly is a fully passive analog sensing component with zero memory or signal processing hardware. All vibration amplitude, axial thrust displacement, and Keyphasor rotational speed trending records are captured and retained exclusively by the Slot1 3500/20 TDI master communication gateway module. This probe only outputs raw high-frequency eddy-current gap voltage signals without modifying or storing measurement data.
