Configured for high-frequency analog vibration signal transmission in 3500 Machinery Protection System platforms, the Bently Nevada 330730-040-01-00 (330730 Extension Cable) provides direct physical/electrical execution. It conducts high-frequency excitation currents and returns raw AC dynamic vibration and DC gap voltage signals between a 3300 XL 11 mm proximity probe and its matching Proximitor sensor without signal phase shift or amplitude degradation.
Suffix Breakdown & Model Matrix
The suffix options for the ordering code 330730-040-01-00 represent the following physical configurations:
- 330730: Base Model Designation for 3300 XL 11 mm Extension Cable.
- 040: Cable Length Option – 4.0 metres (13.1 feet).
- 01: Connector Protector and Cable Option – Armored cable with miniature coaxial connectors.
- 00: Agency Approval Option – Not required (Standard non-approved area construction).
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 330730-040-01-00 |
| Brand | Bently Nevada |
| Origin | United States |
| Weight | 0.55 kg |
| Dimensions | 4.0 m cable length, 11 mm transducer system standard |
| Operating Temp | -51 deg C to +177 deg C |
| Power Consumption | Passive physical cable interface (0 W) |
| Cable Armor | Flexible stainless steel armor outer casing |
| System Length Match | 4.0 m cable (configured for total 5.0 m or 9.0 m transducer system length) |
| System Impedance | 75 ohm nominal coaxial balance |
| Connector Type | ClickLock miniature coaxial connectors |
Eddy-Current Probe Scaling and Signal Integrity
The 330730 armored extension cable is engineered to maintain tight tolerance on overall system capacitance (69.9 pF/m typical) to enforce linear eddy-current probe scaling (3.94 V/mm or 100 mV/mil). Variations in cable length or capacitance directly alter the tuned LC circuit frequency of the Proximitor sensor, corrupting scale factor accuracy.
During installation and maintenance, technicians perform gap voltage validation (-10 VDC targets at center gap position) across the signal lead and shield. The flexible stainless steel armor delivers high mechanical crushing protection while preventing cross-talk suppression degradation caused by parasitic capacitive coupling in dense cable runs.
Frequently Asked Questions
Q: Can the stainless steel armor of the 330730-040-01-00 cable be grounded at both ends?
A: No. The extension cable armor and inner coaxial shield must remain electrically isolated from machine earth at the probe end. Grounding must be established exclusively at the Proximitor sensor housing to eliminate ground loops that introduce 50/60 Hz line noise.
Q: How does the -01 armored option affect the physical bend radius compared to standard non-armored cables?
A: The stainless steel armor increases the minimum dynamic bend radius requirement to 38.1 mm (1.5 in). Bending the cable beyond this limit risks buckling the inner coaxial sheath and altering physical conductor geometry.
Field Installation Guidelines
- Inspect the 330730 extension cable for mechanical sheath cuts, crushed armor sections, or moisture ingress before mounting.
- Route the cable through protective cable trays or conduit, maintaining a minimum bend radius of 38.1 mm (1.5 in) along the armor run.
- Keep the extension cable separated from high-voltage motor feeds and variable frequency drive output cables by a minimum clearance of 300 mm to avoid electromagnetic interference.
- Mate the ClickLock miniature coaxial connectors until a firm click is felt; tighten the threaded coupling finger-tight plus 1/8 turn. Do not apply heavy pliers or over-torque tools.
- Verify that gap voltage validation yields approximately -10.0 VDC across the Proximitor output terminals when the target shaft rests at mid-span journal clearance.
- Terminate the overall drain shield wire strictly at the instrument system earth point at the Proximitor sensor enclosure.
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