Description

The Bently Nevada 18745-02, also cataloged as the 18745-02 Proximitor Sensor, operates as a dedicated hardware component for continuous machinery protection and displacement monitoring within 7200 Series Transducer platforms.

Hardware Specifications

Eddy-Current Probe Scaling and Gap Voltage Validation

The module continuously conditions high-frequency radio frequency signals generated across the system probe tip. During installation and field commissioning, technicians perform gap voltage validation across the driver loop terminals to confirm the target sits within the linear window, aiming for a baseline of -10 VDC under standard conditions. Furthermore, the specialized internal architecture suppresses cross-talk between multi-channel cable runs, directly preserving phase integrity for critical rotor dynamics evaluation. The integrated circuitry inherently scales the output according to the 200 mV/mil standard factor, which systematically converts eddy-current impedance drops into direct analog voltage signals without introducing drift or signal corruption.

Frequently Asked Questions

Q: What specific total cable length does the 18745-02 Proximitor sensor require for correct calibration?

A: The 18745-02 requires pairing with a specific 5-meter or 9-meter total system length (combining probe and extension cable) to match the internal oscillator tuning and maintain the 200 mV/mil scale factor.

Q: Can this older 7200 series sensor interface with the newer 3500 machinery protection monitors?

A: Yes, technicians can route the analog output signal from the 18745-02 directly into the 3500/42M Proximitor Monitor card, provided they select the correct 7200 system sensor type in the configuration utility.

Field Installation Guidelines

• Mechanical Panel Mounting: Mount the Proximitor housing inside a local weatherproof junction box using the provided base plate slots. Consequently, tighten all mounting hardware securely to minimize mechanical casing vibration.
• Shield Grounding Control: Terminate the external three-conductor extension cable shield explicitly at the monitoring rack instrument ground bus bar. Specifically, isolate the field-end shield with heat-shrink tubing to prevent ground loops from injecting noise into the vibration loop.
• Conduit Separation Rules: Route all coaxial extension lines through dedicated, low-voltage instrument raceways. Maintain a structural separation of at least 300 mm from three-phase motor lines to shield the high-frequency eddy-current signal from EMI interference.