Configured for high-frequency signal transmission between proximity probes and Proximitor sensors in 3500 Machinery Protection System networks, the Bently Nevada 330854-040-24-05 (330854 Extension Cable) provides direct physical/electrical execution. It conducts RF excitation signals and returns dynamic AC vibration along with DC gap position voltages across the transducer interface without introducing phase lag or attenuation.
Suffix Breakdown & Model Matrix
The ordering options for the 330854-040-24-05 extension cable define the physical, environmental, and hazardous area certifications:
- 330854: Base Model Designation for 3300 XL 25 mm Extension Cable.
- 040: Cable Length Option – 4.0 meters (13.1 feet).
- 24: Armor and Cable Option – High Temperature FluidLoc cable.
- 05: Agency Approval Option – Multiple Approvals (CSA, ATEX, IECEx hazardous area certifications).
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 330854-040-24-05 |
| Brand | Bently Nevada |
| Origin | United States |
| Weight | 0.140 kg (Shipping Weight: 1.5 kg) |
| Dimensions | 8.89 cm x 11.7 cm x 24.1 cm (Package/Spool dimensions, 4.0 m cable length) |
| Operating Temp | -35 deg C to +200 deg C (-31 deg F to +392 deg F) |
| Power Consumption | Passive physical media (0 W) |
| Cable Capacitance | 69.9 pF/m (21.3 pF/ft) typical |
| Cable Material | 75 ohm triaxial, perfluoroalkoxyethylene (PFA)-insulated FluidLoc cable |
| Connector Type | ClickLock miniature coaxial connectors |
Gap Voltage Validation and Cross-Talk Suppression
The 330854-040-24-05 extension cable maintains a tight 69.9 pF/m capacitance tolerance to preserve linear eddy-current probe scaling across wide operating displacement spans. Precision impedance matching prevents shift in the Proximitor oscillator circuit frequency, ensuring accurate translation of target clearance into dynamic vibration and position values.
During field commissioning, gap voltage validation requires verifying output baseline signals against target -10 VDC levels at the Proximitor terminals when the shaft rests at static mechanical equilibrium. The FluidLoc internal barrier design prevents fluid capillary migration along the inner core, protecting signal purity and cross-talk suppression between closely spaced orthogonal probe channels in turbulent bearing housings.
Frequently Asked Questions
Q: Can the 330854-040-24-05 cable be field-cut to fit precise conduit lengths?
A: No. Altering the physical length changes total system capacitance and resistance, which destroys factory calibration tuning, alters eddy-current probe scaling, and creates scale factor errors during gap voltage validation.
Q: How does the FluidLoc PFA cable jacket perform in high-temperature environments?
A: The PFA insulation and FluidLoc construction withstand ambient temperatures up to +200 deg C while maintaining a fluid barrier that blocks hot synthetic oils and moisture from penetrating the inner triaxial core.
Field Installation Guidelines
- Inspect the PFA jacket, ClickLock miniature coaxial connectors, and pin contact surfaces for dirt or mechanical abrasion before installation.
- Route the cable through dedicated metallic conduit or cable trays, ensuring a minimum static bend radius of 25.4 mm (1.0 in).
- Maintain a minimum physical separation of 300 mm between the extension cable and high-voltage AC motor lines or variable frequency drive (VFD) output cables.
- Align the coaxial ClickLock connectors, press firmly until the locking ring latches, and pull a protective boot over the junction to seal out moisture.
- Perform gap voltage validation at the Proximitor output terminals with a digital multimeter to confirm the baseline voltage reads approximately -10 VDC under static shaft conditions.
- Connect the cable shield exclusively to instrument earth ground at the Proximitor rack side. Leave the shield floating at the probe side to prevent ground loops.
What's clients say about us
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Engineering Lead, GermanyTop-tier Service and Quality
We have sourced Honeywell and Schneider parts here for two years. Every shipment arrives well-packaged with original factory seals intact. Clear communication and the best lead times in the industry.
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Operations Director, GermanyRelated Products
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