Bently Nevada 330708-00-10-90-02-00 Replacement for 3300 XL

Product Overview

Bently Nevada 330708-00-10-90-02-00 Replacement for 3300 XL: Smooth Transition from Legacy Vibration Monitoring Systems

The Bently Nevada 330708-00-10-90-02-00 is an eddy current proximity probe designed for the 3300 XL Series continuous vibration monitoring platform. As rotating machinery protection systems age and OEM support for legacy configurations becomes increasingly limited, plant engineers and reliability teams face mounting pressure to source direct-replacement probes that maintain signal integrity, wiring compatibility, and system certification without triggering a full rack overhaul.

This probe operates on the standard Bently Nevada eddy current sensing principle, generating a linear output voltage proportional to the gap between the probe tip and the observed conductive target surface. It is engineered for radial shaft vibration, axial position, and differential expansion measurement in turbines, compressors, pumps, and gearboxes where continuous online monitoring is mandatory under API 670 or equivalent plant protection standards.

When migrating from an earlier-generation 3300 Series installation — including systems originally built around the 3300/16 or 3300/20 monitor cards — the 330708-00-10-90-02-00 maintains the same 5-metre armored cable assembly, 8 mm probe tip diameter, and -24 VDC driver supply compatibility. This means existing field wiring, junction boxes, and conduit runs can be retained without modification, dramatically reducing installation labor and the risk of wiring errors during a live-plant replacement window.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful proximity probe replacement rarely involves the probe alone. In most 3300 XL retrofit projects, the probe is one component in a tightly coupled measurement chain. The proximitor/extension cable assembly — typically the 330130-080-00-00 or 330130-045-00-00 extension cable — must be matched to the probe’s calibrated gap range and target material. If the existing extension cable shows signs of shield degradation or connector corrosion, replacing it alongside the probe eliminates a common source of signal noise that can trigger false alarms on the 3500/40M Proximitor Monitor card.

For installations where the 3500 rack is also being refreshed, the 3500/40M monitor module handles up to four proximity probe channels and is the standard pairing for this probe in API 670-compliant machinery protection systems. Plants running older 3300/16 monitor cards may find that upgrading to the 3500/40M simultaneously resolves both the probe obsolescence and the monitor card end-of-life issue in a single maintenance window, minimizing total downtime.

Where the control cabinet also houses a 3500/20 rack interface module or a 3500/22M transient data interface, the analog output from the 330708-00-10-90-02-00 feeds directly into these modules without signal conditioning adapters. Similarly, if the plant DCS — such as a Honeywell Experion PKS or an Emerson DeltaV system — receives vibration data via a 4–20 mA output card, the existing I/O wiring and channel assignments remain valid after the probe swap.

In compressor train applications where the 330708-00-10-90-02-00 monitors radial shaft position alongside a thrust position probe such as the 330500-02-05 axial probe, both probes share the same -24 VDC supply rail and can be replaced during the same planned outage. The 3500/42M Proximitor Monitor, which handles both radial and axial channels, requires no reconfiguration when the probe model remains within the 330708 family.

For sites performing a broader machinery protection upgrade that includes replacing keyphasor probes — such as the 330980-50-05 or 330980-70-05 — the 330708-00-10-90-02-00 integrates into the same 3500 rack without additional rack slots or power budget changes. The keyphasor signal continues to provide phase reference for the vibration channels, and the existing System 1 or Orbit software configuration requires only a probe serial number update rather than a full channel reconfiguration.

Where field junction boxes use standard Bently Nevada barrier strips or intrinsically safe barriers for hazardous area installations, the 330708-00-10-90-02-00 is compatible with existing IS barrier models rated for the 3300 XL probe family, avoiding the need for barrier replacement or ATEX/IECEx re-certification of the field installation.

Retrofit Guidance FAQ

Q: Can I replace the 330708-00-10-90-02-00 without recalibrating the monitor card?
A: Yes, provided the replacement probe is from the same 330708 family and the gap is set to the same nominal value (typically 1.0 mm or 1.5 mm depending on target material). The 3500/40M and 3300 XL monitor cards store calibration data per channel; a same-family probe swap does not require a full recalibration, only a gap verification at commissioning.

Q: Is the wiring pinout identical to the probe it replaces?
A: Yes. The 330708-00-10-90-02-00 uses the standard Bently Nevada coaxial connector scheme: center conductor carries the signal, shield is the -24 VDC return. No wiring changes are required at the junction box or monitor card terminal block.

Q: What communication protocol does this probe use?
A: The probe outputs a passive analog DC voltage signal. There is no digital protocol involved at the probe level. The 3500/40M monitor card converts this to a 4–20 mA or digital output (Modbus, FOUNDATION Fieldbus, or Profibus depending on the rack’s communication gateway card) for DCS integration.

Q: Will this probe fit the existing probe boss and mounting thread?
A: The 330708-00-10-90-02-00 uses the standard 3/8-24 UNF thread common to the 8 mm 3300 XL probe family. If the existing boss was machined for a 330708-series probe, the replacement is a direct mechanical fit. No machining or adapter is required.

Q: How do I verify the probe is functioning correctly after installation?
A: Set the probe gap to the nominal value specified in the machine’s vibration monitoring specification (typically 1.0–1.5 mm). Verify the DC gap voltage at the monitor card input matches the expected value per the 3300 XL calibration curve. Check that the OK relay on the 3500/40M is energized and that the System 1 software shows a valid gap reading before returning the machine to service.

Q: Can this probe be used in hazardous area (Zone 1 / Zone 2) installations?
A: The 330708-00-10-90-02-00 is compatible with Bently Nevada-approved intrinsically safe barriers for hazardous area use. Confirm the specific barrier model and entity parameters against the probe’s IS certificate before installation in classified areas.

Warranty Assurance

Every 330708-00-10-90-02-00 unit supplied by TOPNLMS is covered by a 12-month warranty from the date of shipment. Prior to dispatch, each probe undergoes output linearity verification, cable continuity testing, and connector integrity inspection. Units that do not meet the 3300 XL specification are quarantined and not shipped.

If a unit exhibits a defect in materials or workmanship within the warranty period, TOPNLMS will arrange a replacement shipment or issue a credit note — whichever best suits your plant’s maintenance schedule. Our standard response time for warranty claims is within 2 business days of receiving the defective unit or photographic evidence of the fault.

Stock is held in Xiamen and ships via DHL Express, FedEx International Priority, or sea freight depending on order volume and urgency. Most single-unit orders to Southeast Asia, the Middle East, and Europe are delivered within 5–10 business days. Expedited same-day dispatch is available for orders confirmed before 14:00 CST.

For procurement teams requiring documentation, we can provide a test report, packing list, commercial invoice with HS code, and certificate of origin upon request. All export documentation is prepared in compliance with Chinese customs regulations for industrial electronic components.

To place an order or request a quotation, contact our technical sales team directly:

📧 [email protected]
📞 +86 18359293191