Product Core Brief

• Full Model: 330908-00-08-05-02-CN
• Brand: Bently Nevada (Baker Hughes)
• Series: 3300 XL NSv Compact Mini Eddy-Current Proximity Transducer System

Full Suffix Decode (330908-AA-BB-CC-DD-EE / Final CN Suffix)

1. 330908: Base NSv probe series, mounting thread 3/8-24 UNF American fine thread, non-armored factory integrated cable
2. -00: Unthreaded smooth tip segment length = 0 inch (thread extends fully to sensing tip)
3. -08: Stainless steel probe housing total length = 0.8 inch (80mm) ultra-compact short body
4. -05: Factory pre-attached signal cable length = 0.5 meter
5. -02: Miniature gold-plated ClickLoc tool-free locking coaxial connector, standard FluidLoc oil-sealed molded joint
6. -CN: Special China market certification version, carries NEPSI domestic intrinsic safety explosion certification + ATEX/IECEx global hazardous zone approvals, SIL2 functional safety rating

• Core Function: Miniature narrow-body eddy-current proximity probe for tight limited mounting space on small centrifugal compressors, aero-derivative gas turbines and compact bearing housings. Measures radial shaft vibration, axial thrust displacement and Keyphasor rotational speed signals for machinery safety protection loops.
• Product Type: One-piece factory integrated probe + non-armored 75Ω coaxial signal cable assembly
• Key Specs: 3/8-24 UNF thread | 0.5m FEP non-armored cable | 7.87 V/mm (200 mV/mil) NSv standard sensitivity | FluidLoc anti-lube-oil infiltration molding | Dual domestic + international explosion-proof safety certifications
• Condition: New Original (New Surplus), active OEM power & petrochemical spare, no formal obsolescence schedule

Key Technical Specifications

Product Introduction

This ultra-compact NSv miniature proximity probe solves installation bottlenecks on small rotating equipment with extremely narrow bearing housing mounting ports where standard 8mm/11mm large-body 3300 XL probes cannot be installed. The FluidLoc molded integrated joint eliminates slow measurement drift caused by lubrication oil penetrating coaxial conductors, a major failure point of generic aftermarket replacement probes.

The -CN suffix variant is customized for Chinese petrochemical, LNG, refinery and thermal power hazardous classified zone projects, carrying both international ATEX/IECEx and domestic NEPSI explosion-proof certifications, fully compliant with China’s local explosion safety inspection standards, replacing the standard -05 multi-cert export-only model for domestic bidding and site acceptance.

Complete NSv Measurement System Composition

NSv Mini Probe (330908 series) + optional matching NSv extension cable + dedicated 330980 NSv Proximitor signal conditioner + 3500 series TSI rack monitor

Critical Compatibility Limitation

This NSv probe uses 75Ω coaxial impedance, completely incompatible with standard 50Ω triaxial 8mm/11mm 3300 XL probe front ends (330180 series). Cross-mixing hardware will destroy linearity and produce severe permanent measurement offset errors.

Model Series Distinction

• 330901: 1/4-28 UNF NSv mini probe
• 330908: 3/8-24 UNF NSv mini probe (this model)
• 330909: M8 metric thread NSv mini probeAll NSv series share identical 75Ω electrical matching, interchangeable within the full NSv system.

Firmware & Software Compatibility Notes

This probe is a passive analog sensing assembly with no onboard firmware. System matching rules for paired NSv Proximitor and 3500 TSI rack monitors:

• Minimum compatible 3500 monitor firmware revision: Revision G
• Minimum Rack Configuration Software version: v2.00
• All M-series monitor modules inside the 3500/05 chassis must run unified matching firmware revisions to correctly interpret the NSv 200 mV/mil linear gap voltage characteristic curve.
• Mandatory commissioning step: Input total combined transducer length (0.5m probe + optional extension cable) into rack configuration software to activate built-in cable capacitance linearity compensation; incorrect length input generates permanent static measurement offset errors.

Frequently Asked Questions

1. Can I disconnect the NSv probe ClickLoc connector while the NSv Proximitor 24VDC power remains live?Yes, power shutdown is not required for connector disconnection. Unplugging the RF input triggers persistent channel fault alarms on the 3500 rack and cuts all vibration/thrust displacement data, but no permanent damage occurs to the Proximitor internal circuit or rack monitor analog input. Fully re-seat the ClickLoc connector until the locking tab clicks to clear fault status.
2. Is this part obsolete? Are there direct plug-and-play alternative variants?This compact NSv probe remains active OEM stock with no end-of-life date:

• General industrial non-hazardous version: 330908-00-08-05-02-00 (no explosion certifications, cannot be deployed in classified zones)
• Global export multi-cert version: 330908-00-08-05-02-05 (ATEX/IECEx/CSA only, without Chinese NEPSI, fails domestic hazardous zone site inspection)The -CN version is uniquely qualified for Chinese explosion classified safety instrumented loops and cannot be zero-modification interchanged with -00/-05 for domestic refinery/chemical plant projects.

1. Will transducer linearity or gap calibration data erase if the rack loses full power?All NSv system length and sensitivity 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 only requires physical reconnection with zero software rework if total transducer length stays unchanged.
2. What warranty and reliability differences separate New Surplus original vs refurbished units?New Surplus factory original probes carry a 12-month full functional warranty covering coil linearity, 75Ω coaxial impedance consistency, ClickLoc connector plating integrity, FluidLoc molded seal performance, and full NEPSI/ATEX certification validity. Refurbished probes only offer 3–6 month limited coverage, with hidden risks of cracked PPS tip insulation, worn connector locking tabs, and compromised liquid sealing that cause drifting vibration readings during turbine thermal load cycles.
3. Why is New Surplus original pricing higher than generic used/refurbished alternatives?All brand-new original probes pass complete standardized factory QC validation: serial traceability against OEM production logs, full 0–1.75mm linearity sweep bench testing, 24-hour thermal soak aging test, RF input impedance matching verification, 1000-cycle connector lock durability testing, and sealed anti-static factory packaging with full dual certification documentation. Refurbished units skip this multi-step electrical and mechanical testing workflow, introducing unplanned downtime risk for safety-critical compressor vibration and thrust position protection loops.
4. Can this NSv mini probe mate with standard 330180 series 8mm XL Proximitor sensors?No, this NSv probe uses 75Ω coaxial matching parameters exclusive to 330980 NSv dedicated front ends. Standard 8mm XL probe systems adopt 50Ω triaxial cables with different capacitance matching parameters; cross-mixing hardware completely breaks measurement linearity and generates severe permanent offset errors. Verify NSv vs standard XL impedance before wiring to avoid irreparable Proximitor RF input circuit damage.
5. 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, Keyphasor rotational speed trending records and fault event logs 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.