Description

Configured for differential expansion and axial displacement monitoring in rotating machinery protection networks, the Bently Nevada 330854-040-24-CN (330854 3300 XL 25 mm Extension Cable) provides direct physical/electrical execution.

Suffix Breakdown & Model Matrix

Hardware Specifications

Machinery Monitoring & TSI Characteristics

The extension cable bridges the electrical connection between a 3300 XL 25 mm proximity probe and a 3300 XL Proximitor Sensor. To maintain the accuracy of the overall 12.7 mm linear measurement range, the cable utilizes tightly matched 75 ohm triaxial physical geometry. Furthermore, the specialized FluidLoc internal construction provides cross-talk suppression and blocks oil, moisture, or steam from wicking through the cable body into remote termination junctions. Because precise eddy-current probe scaling requires a consistent electrical impedance profile, this cable passes high-frequency RF signals without phase distortion. Consequently, this stable datapath allows the system to achieve clean gap voltage validation (-10 VDC nominal targets) and transmit sharp raw position data, which assists engineers in evaluating critical rotor dynamics on large steam turbine generators.

Frequently Asked Questions

Q: How do ClickLoc connectors prevent signal interruption in high-vibration applications?

A: The gold-plated ClickLoc coaxial connectors feature a positive-locking mechanism that physically resists mechanical loosening under persistent turbomachinery vibration.

Q: Can this cable withstand direct exposure to high-pressure steam inside turbine housings?

A: Yes, the PFA fluoropolymer insulation and FluidLoc internal barrier layers actively prevent moisture infiltration at continuous process temperatures up to 200 deg C.

Q: What happens to the proximity system calibration if field technicians trim the cable length?

A: Trimming modifies the internal capacitance and electrical length, which alters the eddy-current probe scaling; therefore, technicians must never cut or splice this calibrated cable.

Field Installation Guidelines

• Connect the cable to the probe and Proximitor Sensor using the integrated ClickLoc connectors, then verify the physical connection clicks firmly into place to confirm full mechanical engagement.
• Install the provided disposable connector protectors over the physical joints, because this step actively guards the coaxial interfaces against oil and atmospheric contaminants.
• Maintain a minimum structural bend radius of 25.4 mm along the routing run, because over-bending damages the internal triaxial shield layers and degrades transmission performance.
• Route the extension cable inside a dedicated, grounded metal conduit or tray system, which isolates the low-voltage RF signals from high-voltage AC electrical lines.