Bently Nevada 330903-00-21-05-02-00 3300 NSv Proximity Probe | Replacement, Equivalent & Selection Guide
The Bently Nevada 330903-00-21-05-02-00 is a high-performance eddy-current proximity probe from the 3300 NSv Series, engineered for continuous, non-contact vibration and position measurement in rotating machinery. This page provides full technical specifications, compatible replacement models, application guidance, and a structured selection guide to help engineers and procurement teams make confident sourcing decisions.
Technical Specifications
- Part Number: 330903-00-21-05-02-00
- Series: 3300 NSv (Non-Standard Voltage)
- Manufacturer: Bently Nevada (Baker Hughes)
- Sensor Type: Eddy-Current Proximity Probe
- Measurement: Radial vibration, axial position, differential expansion
- Cable Length: 5 m (standard extension cable)
- Probe Tip Diameter: 5 mm
- Thread Size: M8 × 1.0
- Operating Temperature: −35 °C to +177 °C
- Sensitivity: 7.87 V/mm (200 mV/mil)
- Linear Range: 0.25 mm to 2.54 mm (10 mil to 100 mil)
- Output: −18 VDC nominal (NSv output)
- Connector: Integral coaxial, compatible with 3300 XL driver/monitor systems
- Approvals: CE, ATEX, IECEx (consult datasheet for zone ratings)
- Weight: Approx. 40 g
Compatible Replacement & Equivalent Models
The following models are functionally equivalent or drop-in replacements for the 330903-00-21-05-02-00. Always verify system driver compatibility before substitution.
- 330903-00-21-05-02-00 — OEM original (this listing)
- 330903-00-21-05-CN-00 — China-market variant, same electrical spec
- 330903-00-21-10-02-00 — 10 m cable variant, same probe head
- 330730-040-01-00 — 3300 XL 8 mm probe, compatible with same 3300 drivers (verify gap range)
- 330780-50-00 — 3300 XL 5 mm probe, direct dimensional equivalent
- Emerson 330903 Series — Post-acquisition equivalent under Emerson/Baker Hughes branding
- Third-party 5 mm eddy-current probes — Must match: −18 V NSv output, 200 mV/mil sensitivity, M8×1.0 thread, and 3300-series driver compatibility
⚠ Note: Always confirm driver/monitor system compatibility (3300 XL, 3500, or 3300 NSv) before ordering a replacement.
Why Choose the Original Model
- Factory-calibrated sensitivity and linearity — no field adjustment required
- Proven reliability in API 670-compliant machinery protection systems
- Seamless integration with Bently Nevada 3300 XL drivers, 3500 monitors, and System 1 software
- Traceable quality — each probe ships with calibration documentation
- Long service life in high-temperature, high-vibration environments
Typical Applications
- Steam and gas turbine shaft vibration monitoring
- Centrifugal compressor radial and axial position measurement
- Pump and motor bearing clearance monitoring
- Gearbox and expander rotor dynamics analysis
- Petrochemical, power generation, and LNG plant machinery protection
System Compatibility
- Driver/Oscillator: Bently Nevada 3300 XL NSv Driver (e.g., 330180-X1-05)
- Monitor: Bently Nevada 3500 Series, 3300 Series rack monitors
- Software: System 1 Evolution, Orbit 60 Series
- Target Material: AISI 4140 steel (standard); consult Bently Nevada for non-standard alloys
- Extension Cable: 330130-080-00-00 (8 m) or matched cable sets per system design
Selection Guide
Use the table below to select the correct 3300 NSv probe configuration for your application:
- Probe tip diameter: 5 mm (this model) vs. 8 mm (330730 series) — choose based on available installation space
- Cable length: Encoded in part number positions 5–6 (e.g., -21- = 1 m probe + extension; total system cable = probe + extension cable)
- Output voltage: NSv (−18 V) for 3300 NSv drivers; confirm driver input spec before ordering
- Temperature rating: Standard (−35 °C to +177 °C) covers most turbomachinery; high-temp variants available on request
- Hazardous area: Confirm ATEX/IECEx zone classification matches your installation zone
- Target material: Verify target alloy against Bently Nevada sensitivity correction tables if non-standard steel is used
Quality Assurance & Sourcing
- All units sourced from authorized distributors or verified surplus channels
- Pre-shipment inspection: visual, dimensional, and electrical output verification
- Calibration certificate available upon request
- Packaging: anti-static, moisture-proof, original or equivalent OEM-style packaging
- Lead time: typically 3–7 business days for in-stock units; expedited sourcing available
How to Order
To place an order or request a quote for the Bently Nevada 330903-00-21-05-02-00:
- Click Add to Cart or Buy Now on this page
- Email: support@konmask.com
- Phone/WhatsApp: +0086 19859288691
- Provide your required quantity, delivery address, and any certification requirements
- Bulk and OEM pricing available for orders of 5+ units
Replacement & Compatibility FAQ
Q: Can I use a 330903-00-21-10-02-00 (10 m cable) as a direct replacement?
A: Yes, if your installation allows the longer cable. The probe head and electrical specifications are identical; only the extension cable length differs.
Q: Is this probe compatible with the Bently Nevada 3500 monitor system?
A: Yes, when paired with the correct 3300 NSv driver module. The 3500 monitor accepts the driver output signal.
Q: Can third-party probes replace the 330903-00-21-05-02-00?
A: Third-party probes with matching sensitivity (200 mV/mil), output (−18 V NSv), and thread (M8×1.0) can be used in non-API 670 critical applications. For API 670 machinery protection, OEM or certified equivalent parts are strongly recommended.
Q: What is the difference between 3300 NSv and 3300 XL probes?
A: NSv (Non-Standard Voltage) probes output −18 VDC and require NSv-specific drivers. 3300 XL probes use a different output range. They are not interchangeable without matching driver changes.
Q: Do you provide calibration certificates?
A: Yes. Calibration documentation is available upon request for all units.
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