Description
When configuring a critical machinery protection system for a high-speed compressor or steam turbine, a mismatched proximity probe loop is a recipe for false trips. The Bently Nevada 330905-00-25-05-02-05 is a 3300 NSv (Narrow System vent) Proximitor Sensor designed specifically for situations where tight physical clearances constrain the use of standard 5mm or 8mm proximity probes. This unit conditions the radio frequency (RF) signal sent to the transducer and converts the changing gap into a highly accurate, linear voltage output proportional to shaft vibration or position.
We maintain stock of this precise configuration, ready to ship to industrial facilities globally.
Model Number Breakdown (Configuration Specs)
To ensure this exact unit matches your existing instrumentation loop, verify the option codes parsed from the part number sequence:
- 330905: 3300 NSv Proximitor Sensor Series
- -00: Total Length / Mounting Option (Panel Mount / No DIN rail hardware)
- -25: Total System Length (2.5 meters)
- -05: Mounting Option (Standard panel mount)
- -02: Agency Approval Option (ATEX / IECEx / CSA Intrinsic Safety & Non-Incendive certifications)
- -05: Hardware Option (Standard multi-language manual and packaging included)
Commercial Availability & Logistics Terms
- Condition: New Original, Factory Sealed (with OEM calibration tracking sticker intact)
- Availability: In Stock
- Standard Lead Time: 1–3 business days for international courier pickup
- Warranty Support: 12-month complete functional warranty
- Pricing Protocol: The listed price on this B2B catalog is a baseline spot market reference. Actual final transaction pricing depends on regional compliance surcharges, contract tiering, and volume. Request a formal quote for firm pricing.
Technical Specifications
| Parameter | Value |
| System Compatibility | 3300 NSv Proximity Transducer System |
| Output Scale Factor | 7.87 V/mm (200 mV/mil) nominal |
| Linear Range | 0.25 to 1.78 mm (10 to 70 mils) |
| Supply Voltage Required | −24 V DC nominal (range: −17.5 V DC to −26 V DC) |
| Current Consumption | Less than 12 mA |
| Operating Temperature | −51 to +100 °C |
| Enclosure Material | A380 Aluminum (corrosion-resistant coating) |
| Net Weight | 0.25 kg |
Field Operational Insights & Calibration Rules
In field deployments of 3300 NSv systems, engineers frequently mistake a “-25” (2.5 meter) Proximitor for a standard 5.0 meter unit. This specific sensor is calibrated exclusively for a total loop length of 2.5 meters. This means the combined length of your proximity probe plus any extension cable must equal exactly 2.5 meters. If you hook this up to a 5.0 meter extension cable, your scale factor will drift wildly away from the calibrated 200 mV/mil specification, resulting in massive measurement errors on your 3500/20 rack.
The “-02” agency option indicates this unit is rated for hazardous areas. When replacing an older sensor within an intrinsically safe loop, verify the condition of the isolation barriers inside your instrument cabinet. To be frank, if the coaxial connector (ClickLoc) on the probe extension cable shows signs of fluid ingress or physical flattening, replace the cable along with the sensor. Poorly mated coaxial connections introduce high-frequency noise that the Proximitor interprets as false thrust position changes.
Global Trade, Shipping, and Customs Compliance
Global trade done right creates competitive advantage. Moving specialized monitoring instrumentation across international ports requires precise regulatory handling.
- HS Code Classification: This sensor falls under HS Code 9031.80.80 (Other measuring or checking instruments, appliances, and machines).
- Export Control & Compliance: Because this instrumentation is deployed on high-value turbomachinery, it undergoes automated screening against regional denied-parties lists. The ECCN is typically categorized as EAR99 unless specific high-accuracy aerospace caveats apply.
- Incoterms & Freight Options: Shipped under EXW (Ex Works) or CIP (Carriage and Insurance Paid to destination) via standard international express lines (DHL, FedEx, or UPS). We handle all line-item commercial invoicing with accurate weights in kg to ensure rapid customs clearance.
Frequently Asked Questions
Can I use a standard 3300 XL 8mm probe with this 330905 NSv Proximitor?
No. The NSv series uses an entirely different target-size calibration and RF frequency profile compared to the standard 3300 XL 8mm line. Mixing an NSv Proximitor with an 8mm probe will yield completely unusable non-linear voltage readings. Always match NSv sensors with NSv probes.
What is the significance of the isolated coaxial connector on the unit?
The coaxial connector on the Proximitor housing is insulated from the metal casing. This design choice prevents accidental ground loops through the mounting plate, ensuring the sensor signal ground remains fully isolated until it reaches the monitoring rack terminal blocks.
What type of machinery (e.g., turbocharger, small pump, or gearboxes) are you installing this NSv sensor on? If you are working against a tight maintenance shutdown window or need to clarify specific customs documents for your country, share your project requirements below.
