330103-00-22-50-12-00 Bently Nevada 3300 XL 8 Mm Proximity Probes
The Bently Nevada 330103-00-22-50-12-00 is a heavy-duty, reverse-mount 3300 XL 8 mm proximity probe engineered to monitor dynamic shaft vibration and axial position inside critical, tight-clearance rotating machinery. It solves the costly engineering headache of adjusting sensors in inaccessible spaces by utilizing a rear-locking, threadless forward body that slips cleanly through machine housings, allowing all depth calibration to be handled from the exterior flange. Compared to standard front-mounting models, this premium reverse-mount configuration features a highly durable FluidLoc® armored cable that blocks hot lubricating oils from wicking into external electronics, delivering an API 670 compliant 2.0 mm (80 mil) linear sensing range that handles the toughest industrial turbine environments with absolute signal precision.
Automation Engineer's Note
"When working with the 330103-00-22-50-12-00, keep in mind that its 5.0-meter integrated length means it is a 'total-length' system component. Unlike short 1.0-meter probes that require a separate extension cable to meet the Proximitor's impedance loop tuning, this 5.0-meter probe hooks directly into a 5.0-meter tuned Proximitor sensor. Do not add an extension cable to this circuit, or you will throw off the scale factor and ruin your vibration metrics. When setting the physical gap distance, use a digital multimeter at the Proximitor to dial in a raw DC voltage readout of exactly -10.0 Vdc--this anchors the sensor dead-center on its linear curve to allow room for both rapid radial vibrations and slow thermal axial growth."
Product FAQ
Q: Why would a plant choose a 2.2-inch (Option 22) case length over shorter reverse-mount probes?
A: The 2.2-inch case length is specifically chosen for heavy industrial machinery with thick housing walls or specialized internal fluid-film bearing caps. Shorter probes might not reach deep enough to target the shaft surface properly, whereas the extended 56 mm barrel ensures the probe tip is correctly positioned relative to the target without sacrificing external mounting stability.
Q: What is the significance of the FluidLoc® feature denoted by the '12' option code?
A: In high-pressure turbine housings, oil mist can seep into the minute gaps between standard cable copper wire braids and the outer insulation layer. Over months of service, this oil travels like a straw, eventually leaking into and ruining your external junction terminal boxes. The FluidLoc® internal barrier acts as a physical plug inside the cable insulation, sealing the wire core completely and halting oil migration in its tracks.
Q: Can this 3300 XL 8 mm probe target a small gear tooth wheel for speed measurements?
A: While it can detect moving metallic targets, Bently Nevada's 8 mm proximity probes are optimized for flat or smoothly curved shaft surfaces (minimum 50 mm/2 inch diameter target) to track vibration and axial position. For targeting narrow gear teeth or measuring machine RPM/speed, you should instead source a dedicated narrow-view sensor like the 3300 XL NSv series or a magnetic speed pickup.
Verified Field Application Case
Project: Induced Draft Fan Fluid Bearing Retrofit
Location: Gladstone Power Station, Queensland, Australia
Environment: High-frequency bearing housing tremors, persistent fly-ash dust, and hot synthetic lubricating oil splashes.
Deployment Result: A critical ID fan setup suffered frequent electrical failures when hot bearing lubricants wicked through generic unarmored sensor cables, filling the outdoor junction boxes with oil and causing short-circuits. Maintenance teams retrofitted the fan with the Bently Nevada 330103-00-22-50-12-00 reverse-mount probe. The integrated FluidLoc® construction stopped the oil leaks instantly, while the ruggedized stainless steel armor shielded the cable from abrasive fly-ash particles. The monitoring system achieved 100% data fidelity, allowing the plant to track shaft position continuously across a 12-month run without a single false signal trip.
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The Amikon Benefit
100% Original | Factory Sealed | Lowest Lead Times
Global Distribution Network
Amikon supplies industrial automation parts to more than 150 countries, covering a wide mix of regions.
The Americas: especially the USA and Canada, still rely quite a lot on replacement parts. Many sites there are older facilities like refineries or chemical plants.
Europe: similar, with countries such as Germany, UK, France and Italy. A lot of work there is about keeping existing systems running rather than new installations.
Asia-Pacific: includes China, Japan, South Korea, Singapore and Australia. Industries there range from semiconductors to shipbuilding and mining, depending on the country.
Middle East and Africa: like UAE, Saudi Arabia, Qatar and South Africa, are more focused on energy-related operations, mainly oil, gas and power sectors.
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