Configured for high-frequency analog vibration signal transmission in 3500 Machinery Protection System platforms, the Bently Nevada 330730-080-01-00 (330730 Extension Cable) provides direct physical/electrical execution. It conducts RF field excitation and transfers raw AC dynamic displacement and DC gap voltage signals between a 3300 XL 11 mm proximity probe and a Proximitor sensor without phase distortion or amplitude loss.
Suffix Breakdown & Model Matrix
The ordering breakdown for the 330730-080-01-00 extension cable code specifies the following physical properties:
- 330730: Base Model Designation for 3300 XL 11 mm Extension Cable.
- 080: Cable Length Option – 8.0 metres (26.2 feet).
- 01: Connector and Cable Option – Armored cable (flexible AISI 302 stainless steel armor with outer jacket).
- 00: Agency Approval Option – Not required (Standard non-hazardous area configuration).
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 330730-080-01-00 |
| Brand | Bently Nevada |
| Origin | United States |
| Weight | 0.36 kg (Shipping Weight: 1.5 kg) |
| Dimensions | 8.0 m cable length, 11 mm system standard |
| Operating Temp | -51 deg C to +177 deg C |
| Power Consumption | Passive physical conductor (0 W) |
| Cable Capacitance | 69.9 pF/m (21.3 pF/ft) typical |
| Construction | 75 ohm triaxial, fluoroethylene propylene (FEP) insulated |
| Armor Outer Jacket | Flexible AISI 302 stainless steel (SST) with FEP outer jacket |
| System Target Match | Configured for 9.0 m total system length when paired with a 1.0 m probe |
Eddy-Current Probe Scaling and Rotor Dynamics Analysis
The 330730-080-01-00 armored cable maintains a tight 69.9 pF/m typical capacitance profile to enforce linear eddy-current probe scaling (3.94 V/mm or 100 mV/mil output response). Deviations in physical cable capacitance directly shift the resonant circuit frequency of the 3300 XL Proximitor sensor, introducing measurement error into rotor dynamics tracking and phase angle calculations.
During installation and field loop checks, gap voltage validation targets a nominal -10 VDC reading at the Proximitor output terminals when the shaft rests in the center of its mechanical journal clearance. The flexible AISI 302 stainless steel armor protects the internal 75 ohm triaxial core against mechanical crushing while suppressing parasitic inductive coupling in dense cable runs.
Frequently Asked Questions
Q: Can the 330730-080-01-00 extension cable be cut to length in the field if 8.0 m is too long?
A: No. Shortening or splicing the cable alters the total system electrical length and capacitance, destroying factory calibration and causing severe scale factor errors in gap and vibration measurements.
Q: How is the stainless steel armor grounded on the 330730-080-01-00 cable assembly?
A: The armor sheath is electrically isolated from the inner signal conductors. The cable shield must be grounded exclusively at the Proximitor sensor housing and left floating at the probe junction to prevent earth potential loops.
Field Installation Guidelines
- Inspect the AISI 302 stainless steel armor and FEP outer jacket for structural cuts or mechanical crushing prior to routing.
- Pull the cable through designated cable trays or conduit, observing a minimum static bend radius of 38.1 mm (1.5 in) along the armored section.
- Maintain a minimum separation distance of 300 mm between the extension cable run and high-voltage power lines or variable frequency drive (VFD) output wiring to limit inductive interference.
- Align the coaxial connectors, push until fully engaged, and secure hand-tight plus 1/8 turn. Avoid applying excessive torque using heavy hand tools.
- Perform gap voltage validation across the Proximitor sensor signal output terminals; confirm the DC bias voltage reads approximately -10.0 VDC when the machine shaft is centered.
- Terminate the cable outer shield wire to the dedicated system instrument ground at the Proximitor enclosure only.
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