The Bently Nevada 330730-040-00-CN, also cataloged as the 330730 3300 XL 11 mm Extension Cable, operates as a dedicated hardware component for high-frequency analog signal transmission between proximity probes and Proximitor sensors within 3500 Machinery Protection System networks. It conducts high-frequency AC field excitation and returns differential DC/AC gap and vibration voltage signals across the physical probe interface without signal attenuation.
Suffix Breakdown & Model Matrix
The ordering options for the 330730-040-00-CN extension cable structure are defined as follows:
- 330730: Base Model Designation for 3300 XL 11 mm Extension Cable.
- 040: Cable Length Option – 4.0 metres (13.1 feet).
- 00: Connector and Cable Option – Standard cable construction with miniature coaxial connectors.
- CN: Agency Approval Option – ATEX/IECEx and Chinese NEPSI approvals for hazardous area installation.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 330730-040-00-CN |
| Brand | Bently Nevada |
| Origin | United States |
| Weight | 0.42 kg |
| Dimensions | 4.0 m length, 11 mm system compatible |
| Operating Temp | -51 deg C to +177 deg C |
| Power Consumption | Passive physical media (0 W) |
| System Length | 4.0 m cable (configured for 5.0 m or 9.0 m total system match) |
| Capacitance | 69.9 pF/m typical |
| Cable Construction | 75 ohm coaxial, fluorinated ethylene propylene (FEP) outer jacket |
| Connector Type | ClickLock miniature coaxial connectors |
| Hazardous Area Approvals | ATEX, IECEx, NEPSI (Zone 0/1, Ex ia IIC T4...T1 Ga) |
Gap Voltage Validation and Eddy-Current Signal Stability
The 330730 extension cable maintains tight electrical impedance matching (75 ohm nominal) to preserve eddy-current probe calibration linearity across the full operating range. Matched cable capacitance ensures accurate conversion of probe tip displacement into proportional voltage changes (typically 3.94 V/mm or 100 mV/mil for 11 mm systems).
During field setup, gap voltage validation requires verifying a nominal probe bias near -10 VDC at the mid-scale linear position when connected to a 3300 XL Proximitor Sensor. The FEP insulation layer limits dielectric leakage and cross-talk suppression degradation under high electromagnetic interference (EMI) environments.
Frequently Asked Questions
Q: Can the 330730-040-00-CN cable be shortened or spliced in the field?
A: No. Splicing or altering the length alters the total system capacitance and resistance, which destroys the factory calibration curve of the 3300 XL Proximitor sensor and causes significant scale factor errors in gap and vibration readings.
Q: What is the correct procedure for securing the ClickLock coaxial connectors?
A: Align the connector pins, push firmly until the tactile click is engaged, and apply finger tightness plus 1/8 turn. Do not use pliers or over-torque tools, as excessive mechanical stress deforms the internal gold-plated contact pins.
Field Installation Guidelines
- Inspect the cable FEP outer jacket and ClickLock coaxial connectors for debris, moisture, or mechanical damage before installation.
- Route the cable through dedicated electrical conduit or cable trays, maintaining a minimum bend radius of 25.4 mm (1.0 in) to prevent coaxial shield deformation.
- Keep the extension cable isolated from high-voltage power lines and variable frequency drive (VFD) output wiring by at least 300 mm to prevent inductive cross-talk.
- Thread the ClickLock connectors together until fully seated. Apply silicone self-fusing tape or protective connector protectors over the junction if exposed to oil or liquid spray.
- Verify the probe system gap bias voltage using a digital multimeter at the Proximitor sensor terminals; target reading should read approximately -10.0 VDC when the machine shaft is centered in its journal clearance.
- Connect the cable shield to the designated instrument ground at the Proximitor sensor housing only. Maintain ground isolation at the probe end to prevent ground loops.
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