Bently Nevada 330800-28-00-085-02-02 Proximity Transducer Assembly

330800-28-00-085-02-02 PROXPAC XL – Stop the Clock on Your Downtime

Every hour your turbine or compressor sits idle costs real money — production losses, penalty clauses, emergency labor. The Bently Nevada 330800-28-00-085-02-02 PROXPAC XL proximity transducer assembly is one of the most failure-critical components in any API 670 machinery protection loop. When it goes down, you don’t have time to wait three weeks for a factory order. We stock it. We ship it today.

This is a complete, pre-calibrated eddy current transducer assembly — probe, extension cable, and proximitor matched at the factory. No field calibration. No gap-setting guesswork. Pull the failed unit, install this one, verify the DC output voltage at the rack input, and get your machine back online. That’s the entire workflow.

URGENT REQUIREMENT? Contact: [email protected] | WhatsApp: +86 18359268345

Quick Technical Datasheet

Troubleshooting & Replacement Tips

Most common failure modes for the 330800-28-00-085-02-02:

1. Proximitor oscillator failure (most frequent). Symptom: rack card shows a flat –24 VDC or –1 VDC output with no response to shaft movement. The oscillator circuit inside the proximitor is the weakest link — heat cycling and oil contamination accelerate degradation. Confirm by disconnecting the probe from the proximitor and measuring open-circuit output. If it reads outside –18 to –20 VDC with no probe attached, the proximitor is dead. Replace the full PROXPAC assembly — do not attempt to swap only the proximitor on a pre-matched PROXPAC unit, as the factory calibration is tied to the matched set.

2. Extension cable shield break. Symptom: intermittent noise spikes on the vibration waveform, or a slowly drifting DC gap voltage that doesn’t track shaft position. Flex the cable along its length while watching the rack display. A shield break will show as a transient spike. The coaxial cable in this assembly uses a double-shield construction — physical damage near the probe entry or proximitor connector is the typical failure point. Inspect the armor jacket at both terminations first.

3. Probe tip contamination or mechanical damage. Symptom: DC gap voltage reads correctly at rest but vibration amplitude is suppressed or distorted. Remove the probe and inspect the tip face under magnification. Oil varnish, metallic debris, or a chipped tip face will alter the eddy current field geometry. Clean with isopropyl alcohol. If the tip is physically damaged, replace the assembly — lapping or machining the probe tip will shift the scale factor.

Replacement procedure (field-verified steps):

1. De-energize the monitoring rack channel. Note the existing gap voltage before shutdown — you’ll use this as your reinstallation reference.
2. Disconnect the proximitor output cable from the rack input card (BNC or terminal block depending on 3500/3300 card type).
3. Remove the proximitor from its mounting bracket. Note the cable routing — the replacement must follow the same path to avoid induced noise from adjacent power cables.
4. Unthread the probe from the bearing housing. Count the turns — record the thread engagement depth for reinstallation reference.
5. Install the new 330800-28-00-085-02-02 assembly. Thread the probe to the same engagement depth. Do not use thread sealant on the probe threads unless specified by the OEM drawing.
6. Reconnect the proximitor output. Power up the rack channel.
7. Verify DC gap voltage at the rack input. Target: match the pre-shutdown reading ±0.5 VDC. Adjust probe thread engagement in 1/4-turn increments if needed. At 7.87 V/mm scale factor, one full turn of a standard M8 probe thread moves the gap approximately 1.25 mm, shifting output by ~9.8 V — adjust carefully.
8. Confirm alarm and danger setpoints are active. Run a functional trip test per your site procedure before returning the machine to service.

Configuration notes: The PROXPAC XL is a self-contained, pre-matched assembly — there are no DIP switches, no address settings, and no firmware to configure. The only field adjustment is physical gap setting via probe thread engagement. Rack card configuration (scale factor, gap voltage, alarm setpoints) should already be set for the 330800-series; verify the rack card is not set for a different series (e.g., 3300 XL 8 mm vs. 5 mm) before assuming the replacement is faulty.

Reliability in Harsh Conditions

The 330800-28-00-085-02-02 is built for environments that destroy lesser sensors. The IP67-rated stainless steel proximitor housing is sealed against oil mist, process gas ingress, and high-pressure washdown. The probe body is constructed from 316 stainless steel with a ceramic-filled epoxy tip — chemically resistant to the hydrocarbon and amine environments common in refinery and gas processing applications.

Vibration immunity is a design priority, not an afterthought. The MIL-C-5015 connector system used throughout this assembly was originally developed for military aerospace applications — it maintains electrical continuity under continuous vibration loads that would fatigue standard BNC or push-pull connectors within months. The double-armored coaxial extension cable is rated for continuous flexing in high-vibration installations such as compressor skids where the cable must accommodate machine movement.

Thermal performance is equally robust. The probe is rated to +177°C — sufficient for direct installation in high-temperature bearing housings on steam turbines and hot gas expanders without thermal isolation adapters. The proximitor, rated to +85°C, handles the elevated ambient temperatures typical of turbine enclosures and compressor buildings in tropical and desert climates. Units stored in our Xiamen warehouse are maintained in climate-controlled conditions with humidity control to prevent connector oxidation and cable jacket degradation prior to shipment.

Global Express Logistics

Stock is held in Xiamen, China — one of the best-connected export hubs in Asia, with direct DHL and FedEx gateway access. Here’s how a typical urgent order moves:

• Day 0 (order confirmed before 14:00 CST): Unit pulled from stock, inspected, and packed. Commercial invoice and packing list prepared. Export declaration filed.
• Day 1: DHL Express or FedEx International Priority pickup. Tracking number issued to buyer within 2 hours of handover.
• Day 2–3: Delivery to most Southeast Asian destinations (Singapore, Thailand, Malaysia, Indonesia, Vietnam). Customs clearance typically same-day for industrial components with correct HS code documentation (9031.80.90.90).
• Day 3–5: Delivery to Middle East (UAE, Saudi Arabia, Kuwait), India, and Australia.
• Day 4–6: Delivery to Europe (Germany, Netherlands, UK, Italy) and North America (USA, Canada).

All shipments include a commercial invoice with accurate declared value, packing list with part number and serial number, and country of origin documentation. For customers requiring a Certificate of Conformance or incoming inspection report, these are prepared at time of order and included in the shipment package. We do not under-declare shipment values — accurate documentation protects your customs clearance and your audit trail.

For orders requiring same-day dispatch, contact us directly via WhatsApp before 12:00 CST to confirm stock availability and initiate the export process in parallel with your PO issuance.

Contact Information

📧 Email: [email protected]
💬 WhatsApp: +86 18359268345
🌐 Web: siemensplc.com
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