Description

Configured for converting eddy-current gap modulations into proportional analog DC voltages in machinery protection platforms, the Bently Nevada 330850-90-CN (330850 Proximity Sensors) provides direct physical and electrical execution.

Suffix Breakdown & Model Matrix

• 330850: Designates the base model for the 3300 XL 25 mm Proximitor Sensor.
• -90: Dictates a 9.0 meters (29.5 feet) total system length specifically configured for panel mounting.
• -CN: Indicates country-specific hazardous environment certification, complying with Chinese NEPSI and CCC Ex standards.

Hardware Specifications

Eddy-Current Probe Scaling and Rotor Dynamics

The Bently Nevada 330850-90-CN relies on precise eddy-current probe scaling to monitor large-scale physical shifts in rotating machinery. Because of its 20 mV/mil nominal scale factor, the sensor tracks large shaft displacements, such as differential expansion and axial thrust, during critical rotor dynamics phases. The internal demodulator design actively suppresses high-frequency cross-talk and electromagnetic interference, ensuring clean analog signal transmission back to the monitoring rack.

Frequently Asked Questions

Q: How does the system ensure electrical ground isolation on a panel mount configuration? A: The isolated structural base of the panel mount housing isolates the internal sensor circuitry from the local metal frame. Consequently, this design prevents parasitic ground loop currents from corrupting the dynamic voltage output.

Q: What extension cable configuration does this Proximitor require? A: The unit requires a specific 3300 XL 25 mm extension cable and probe system. The combined length of the probe and extension cable must equal exactly 9.0 meters to maintain correct calibration accuracy.

Field Installation Guidelines

• Mechanical Gapping: Mount the physical 25 mm probe relative to the rotor collar. Adjust the physical sensor distance until the static DC gap voltage output at the Proximitor registers approximately -6.5 VDC, representing the midpoint of the linear range.
• Wiring Termination: Connect the field wiring using the terminal strip. Route all signal cables in grounded metal conduits to block electromagnetic interference. Do not run the signal cables parallel to high-voltage AC motor lines.
• ClickLoc Assembly: Ensure the gold-plated ClickLoc connectors between the coaxial cable and Proximitor lock securely. Turn the connector sleeve to complete the connection, which prevents moisture ingress and maintains impedance continuity.