Bently Nevada 330103-00-21-05-11-05 Proximity Probe

330103-00-21-05-11-05 In Stock — Every Hour of Downtime Costs More Than This Probe

Your turbine is down. The DCS is throwing a Not OK on channel 4. Maintenance pulled the probe and the cable jacket is cracked — classic failure mode on a unit that’s been running 24/7 for three years in a humid, high-vibration environment. You need a Bently Nevada 330103-00-21-05-11-05 on-site before the next shift, not in six weeks. We stock it. We ship it today from Xiamen via DHL Express. That’s the only thing that matters right now.

The 330103-00-21-05-11-05 is an 11 mm eddy-current proximity probe from Bently Nevada’s 3300 XL Series — the de facto global standard for shaft radial vibration and axial position measurement in turbomachinery protection systems. The part number encodes everything: 5 m integral cable, 11 mm tip, standard connector termination. It drops straight into any existing 3300 XL installation without touching the Proximitor calibration. No surprises on the bench, no surprises at startup.

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Quick Technical Datasheet

Troubleshooting & Replacement Tips

Most common failure modes for the 330103-00-21-05-11-05 in the field:

1. Cable jacket degradation / open circuit. The integral 5 m cable is the most vulnerable part of this assembly. High-cycle vibration at the probe body-to-cable junction causes micro-fractures in the jacket and eventually conductor breaks. Symptom: Proximitor output goes to rail (typically −24 V or 0 V) with no shaft movement. Confirm with a cable continuity check before condemning the Proximitor. Replacement is the only fix — field splicing is not acceptable on a protection-grade channel.

2. Probe tip contamination / coating buildup. In environments with oil mist, process gas condensate, or metallic debris, the probe tip accumulates a dielectric layer that shifts the gap calibration. Symptom: static gap voltage reads 0.5–1.5 V high at the same physical gap. Clean the tip with isopropyl alcohol and recheck. If the offset persists after cleaning, the tip ceramic may be damaged — replace the probe.

3. Proximitor mismatch after probe swap. The 3300 XL system uses matched probe-Proximitor pairs. If you install a 330103-series (11 mm) probe against a Proximitor calibrated for an 8 mm probe, the sensitivity (mV/mil) will be wrong and the system will not meet API 670 accuracy requirements. Always verify the Proximitor part number matches the 11 mm probe family before installation.

Replacement procedure checklist (field-proven sequence):

• De-energize the 3500 rack channel or place the monitor in bypass/inhibit mode before disconnecting the probe — avoid nuisance trips.
• Record the existing static gap voltage before removal (typically −10 to −11 VDC for a 50 mil gap on a 3300 XL 11 mm system). This is your target after reinstallation.
• Remove the probe from the holder. Inspect the probe holder threads and seating surface — replace the holder if thread damage is present.
• Install the new 330103-00-21-05-11-05. Set the air gap to achieve the same static gap voltage recorded in step 2. Tighten the lock nut to the torque specified in the Bently Nevada installation manual (do not over-torque — probe body damage is irreversible).
• Route the new cable with the same bend radius and clamp spacing as the original. Minimum bend radius for the 3300 XL integral cable is 25 mm.
• Reconnect at the junction box. Verify polarity — the center conductor is the signal, the shield is the return.
• Re-energize the channel. Confirm static gap voltage matches the pre-removal reading ±0.5 VDC. If it does not, recheck the physical gap before assuming a probe fault.
• Remove bypass/inhibit. Confirm the 3500 rack shows OK status on the channel. Log the replacement in the equipment history.

No firmware or DIP switch configuration is required for this probe. The 330103-00-21-05-11-05 is a passive transducer — all signal conditioning is handled by the Proximitor. The only field adjustment is the physical air gap.

Reliability in Harsh Conditions

The 3300 XL Series was not designed for a climate-controlled instrument room. It was designed for the bearing pedestals of gas turbines in the Middle East, the compressor decks of offshore platforms in the North Sea, and the turbine halls of coal-fired power stations in Southeast Asia. The 330103-00-21-05-11-05 reflects that design intent.

The probe body is machined from stainless steel with a ceramic-filled epoxy tip — resistant to the hydrocarbon solvents, lubricating oils, and process condensates found in turbomachinery environments. The integral cable uses a fluoropolymer jacket rated for continuous exposure to temperatures that would degrade standard PVC insulation. The connector is sealed against moisture ingress at the probe body junction.

Vibration resistance is inherent to the design: the probe is a solid-state device with no moving parts. The failure mode under sustained vibration is cable fatigue at the strain relief, not probe body failure — which is why the replacement interval on high-vibration installations is driven by cable condition, not probe tip wear. In low-vibration installations, 3300 XL probes routinely remain in service for 10+ years without replacement.

For installations in classified hazardous areas (Zone 1/Zone 2, Class I Division 1/2), the 3300 XL system is designed to be used with appropriate intrinsically safe barriers or Zener barriers in the junction box. The probe itself does not carry an independent ATEX/IECEx certification — the system certification applies to the complete probe-cable-Proximitor assembly. Verify your installation’s area classification and barrier requirements before ordering.

Global Express Logistics

We operate from Xiamen, China — one of the most logistics-efficient export hubs on the Chinese coast, with direct DHL Express and FedEx International Priority connections to major industrial hubs worldwide. When you place an urgent order before 14:00 CST, same-day dispatch is standard.

Typical transit times from Xiamen:

• Southeast Asia (Singapore, Thailand, Malaysia, Indonesia): 2–3 business days via DHL Express
• Middle East (UAE, Saudi Arabia, Qatar, Kuwait): 3–4 business days via FedEx International Priority
• Europe (Germany, Netherlands, UK, France): 3–5 business days via DHL Express
• North America (USA, Canada): 4–6 business days via FedEx International Priority
• South America (Brazil, Chile, Colombia): 5–7 business days via DHL Express
• Australia / New Zealand: 3–5 business days via DHL Express

Every shipment includes a full tracking number issued at dispatch. For critical plant shutdowns, we can arrange door-to-door courier with real-time tracking updates and customs pre-clearance documentation (commercial invoice, packing list, certificate of origin) prepared to your importing country’s requirements. We have experience with customs clearance in 40+ countries and can advise on HS code classification and import duty implications for your specific destination.

Packaging is anti-static, padded, and double-boxed for international transit. The probe tip and cable connector are individually protected to prevent transit damage. We do not ship loose probes in bubble wrap — this is precision instrumentation and it is packed accordingly.

Contact Information

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