Bently Nevada 330101-00-25-05-02-05 – Non-Contact Eddy Current Proximity Probe | 3300 XL Series
Engineering Background
The Bently Nevada 3300 XL Series represents the industry benchmark for non-contact shaft vibration and position measurement in rotating machinery. Deployed across power generation, oil & gas, and petrochemical industries for over four decades, the 3300 XL proximity probe system delivers the measurement accuracy and long-term reliability demanded by API 670-compliant machinery protection systems.
Product Positioning
The 330101-00-25-05-02-05 is a 25 mm diameter eddy current proximity probe with a 5-metre integral cable, configured for standard 200 mV/mil (7.87 V/mm) sensitivity. It is the primary sensing element in a three-component system comprising probe, extension cable, and Proximitor® sensor, providing continuous, non-contact measurement of shaft radial vibration, axial position, and differential expansion in critical turbomachinery.
Complete Technical Specifications
| Part Number | 330101-00-25-05-02-05 |
| Series | Bently Nevada 3300 XL |
| Probe Tip Diameter | 25 mm (1 inch) |
| Integral Cable Length | 5 m (16.4 ft) |
| Sensitivity | 200 mV/mil | 7.87 V/mm |
| Linear Range | 2.0 mm – 7.0 mm (80 – 280 mil) |
| Frequency Response | DC – 10,000 Hz (–3 dB) |
| Operating Temperature | –35 °C to +177 °C (–31 °F to +351 °F) |
| Supply Voltage | –24 VDC (nominal) |
| Output Voltage Range | –2 VDC to –18 VDC |
| Probe Body Material | 316L Stainless Steel |
| Cable Jacket | Armoured, chemically resistant |
| Thread | M25 × 1.5 (standard) |
| Connector | 3-pin MIL-C-5015 style |
| Ingress Protection | IP67 |
| Compliance | API 670, CE, ATEX (Zone 1/2), IECEx |
| Weight | Approx. 200 g |
Proven Application Environments
- Steam and gas turbines (radial shaft vibration, axial thrust position)
- Centrifugal and reciprocating compressors
- Boiler feed pumps and large motor-driven equipment
- Gearboxes and expanders in refinery and LNG service
- Hydro turbines and generator shaft monitoring
- API 670 machinery protection systems (MPS)
Engineering Advantages
- Non-contact measurement – zero mechanical wear, continuous operation without maintenance intervals
- Wide frequency bandwidth – DC to 10 kHz captures sub-synchronous, synchronous, and high-frequency vibration events
- High chemical resistance – 316L SS body and armoured cable withstand lube oil, process gas, and cleaning solvents
- Temperature stability – calibrated sensitivity maintained across full –35 °C to +177 °C range
- Direct system compatibility – plug-and-play with Bently Nevada 3300 XL Proximitor® sensors and System 1® software
- ATEX / IECEx certified – approved for use in hazardous area Zone 1 and Zone 2 installations
System Architecture & Signal Flow
The 330101-00-25-05-02-05 operates as the sensing element in the Bently Nevada 3300 XL eddy current measurement chain:
- Probe (330101-00-25-05-02-05) – generates a high-frequency electromagnetic field; eddy currents induced in the target shaft modulate the field proportionally to gap distance.
- Extension Cable (330130 series) – transmits the modulated signal from probe to Proximitor® with minimal signal loss; total system cable length must match Proximitor® calibration (typically 5 m + 5 m = 10 m system).
- Proximitor® Sensor (330180 / 330185 series) – demodulates the signal and outputs a DC voltage proportional to gap: –2 V (near) to –18 V (far), at 200 mV/mil sensitivity.
- Monitor / MPS (3500 series) – processes the Proximitor® output for alarm, trip, and data acquisition functions per API 670.
Sourcing & Quality Verification
- All units sourced from authorised distributors or verified surplus channels with full traceability documentation
- Pre-shipment inspection: visual, dimensional, and electrical continuity checks performed on every unit
- Original Bently Nevada calibration certificates and factory test reports available upon request
- Packaging inspected for tamper evidence; serial numbers cross-referenced against manufacturer records where available
- 30-day return policy for units that do not meet stated specifications
Procurement Process
- Submit enquiry with required quantity and delivery timeline via [email protected] or the product page enquiry form
- Receive quotation with lead time, stock availability, and shipping options within 1 business day
- Confirm purchase order; payment via T/T, PayPal, or credit card accepted
- Unit dispatched with commercial invoice, packing list, and available test documentation
- DHL / FedEx express delivery available worldwide; typical transit 3–7 business days
Technical FAQ
Q: Is the 330101-00-25-05-02-05 compatible with the Bently Nevada 3500 monitoring system?
A: Yes. When paired with a 3300 XL Proximitor® sensor (e.g. 330180-X1-05), the output signal is fully compatible with all 3500 series monitor cards configured for 200 mV/mil proximity inputs.
Q: Can this probe be used with a non-Bently Nevada Proximitor®?
A: The probe is designed and calibrated for use with Bently Nevada 3300 XL Proximitor® sensors. Use with third-party oscillator-demodulators may result in sensitivity deviation and is not recommended for API 670 applications without re-calibration.
Q: What target material is assumed for the factory calibration?
A: Factory calibration is performed against AISI 4140 steel per API 670 Annex D. For non-standard target materials (e.g. Inconel, titanium), a material correction factor or field calibration is required.
Q: What is the difference between part numbers 330101-00-25-05-02-05 and 330101-00-25-10-02-05?
A: The fifth numeric field denotes integral cable length: -05 = 5 m, -10 = 10 m. All other electrical and mechanical specifications are identical.
Q: Do you provide ATEX documentation for hazardous area installations?
A: Yes. ATEX and IECEx certificates are available upon request for units confirmed as Ex-rated variants. Please specify your area classification when enquiring.
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