Configured for high-frequency signal transmission in 3300 XL Proximity Transducer System networks, the Bently Nevada 330930-060-00-00 (3300 XL Standard Extension Cable) provides direct physical/electrical execution between proximity probes and Proximitor sensors.
Suffix Breakdown & Model Matrix
The catalog option code sequence for the 330930-060-00-00 extension cable is structured as follows:
- 330930: Base Model designation for 3300 XL Standard Extension Cable
- 060: Cable Length Option - 6.0 meters (19.7 feet)
- 00: Connector and Cable Option - Standard cable without stainless steel armor
- 00: Agency Approval Option - Standard construction, approvals not required
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 330930-060-00-00 |
| Brand | Bently Nevada |
| Origin | USA |
| Weight | 2.0 kg (Shipping weight) |
| Dimensions | 6.0 meters (19.7 feet) physical length |
| Operating Temp | -51 to 177 deg C (-60 to 351 deg F) |
| Power Consumption | Passive physical conductor loop (zero power dissipation) |
| Construction | Coaxial, fluoroethylene propylene (FEP) insulated |
| Armoring | Option 00 (Without stainless steel armor) |
| Agency Approval | Option 00 (Not required) |
Eddy-Current Probe Scaling & Gap Voltage Validation
The 3300 XL extension cable routes high-frequency excitation currents to maintain matched electrical length and loop impedance between the probe tip and the Proximitor sensor. Preserving exact cable physical length prevents distortion in eddy-current probe scaling, ensuring linear output voltage across shaft dynamic displacement ranges. During field commissioning, gap voltage validation requires verifying the physical probe position until a static baseline voltage of -10 VDC is measured across the Proximitor terminals under non-rotating shaft conditions.
Frequently Asked Questions
Q: Why must the extension cable match the calibrated system length of the Proximitor sensor?
A: The Proximitor sensor circuit is tuned to the capacitance and inductance of a specific overall system length (typically 5 meters or 9 meters total). Installing an incorrect extension cable length alters loop impedance and invalidates eddy-current calibration scaling.
Q: What precautions should be taken when installing unarmored (Option 00) coaxial extension cables?
A: Unarmored FEP cables must be installed inside rigid metal conduit or covered instrument raceways to protect the dielectric layer against physical impact, sharp bends, and heavy mechanical crushing.
Field Installation Guidelines
- Conduit Separation: Route the extension cable through dedicated electrical conduits, keeping it physically separated from AC power lines and variable frequency drive output cables to suppress inductive noise.
- Connector Assembly: Clean ClickLoc coaxial connectors prior to engagement. Push and turn the barrel until fully latched; do not apply excessive rotational torque or axial force on the cable junction.
- Bend Radius Limits: Maintain a minimum bend radius along the 6.0-meter run to avoid compromising the FEP inner dielectric insulation or causing coaxial shield migration.
- Shield Grounding Integrity: Verify shield continuity across all intermediate junction boxes, ensuring the loop is grounded exclusively at the monitoring rack interface to eliminate circulating ground currents.
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