330101-00-25-10-02-00 | Bently Nevada | Proximity Probes

Technical Overview

The Bently Nevada 330101-00-25-10-02-00 is a high-stability eddy-current proximity probe designed for non-contact displacement and vibration measurement of rotating shafts. It operates within the Bently Nevada 3500 Machinery Protection System, interfacing directly with 3500 series monitors via standard 3300 XL or 3300 NSM preamplifiers. The probe generates a high-frequency electromagnetic field; changes in target distance alter the field’s impedance, which the preamplifier converts into a calibrated DC voltage output (typically –2 to –18 VDC). This analog signal transmits over shielded coaxial cable to the monitor, where it processes shaft position, gap voltage, vibration magnitude (peak-to-peak), and dynamic orbit data. The probe’s 25 mm diameter active element and integral 10 m coaxial cable support robust operation in high-vibration, high-temperature environments. Its design complies with API 670 (4th ed.) requirements for machinery protection, including linearity, temperature stability, and thermal drift limits across the specified operating range.

Detailed Specifications

Operational Capabilities

Processes shaft displacement and vibration in continuous-duty rotating equipment. Monitors critical clearance between shaft and bearing housing in centrifugal compressors, steam and gas turbines, and large electric motors. Converts dynamic shaft motion into real-time diagnostic data used for trip logic, trend analysis, and alignment verification. Deployed in Oil & Gas (offshore platforms, pipeline compressor stations) and Power Generation (combined-cycle and nuclear turbine trains). Features G3 corrosion-resistant coating per ASTM B117 (500-hour salt-spray rating). Certified SIL 2 per IEC 61508:2010 when used with Bently Nevada 3500/42M or 3500/53M monitors and configured per System Configuration Manual Rev. D.

Technical FAQ

Q: Is this probe compatible with legacy 3300 system monitors?

A: Yes. The 330101-00-25-10-02-00 is mechanically and electrically compatible with all 3300-series monitors using 3300 XL or 3300 NSM preamplifiers. Verify preamplifier part number (e.g., 330180-50-00, 330180-90-00) and confirm calibration file version matches the probe’s revision level in the monitor’s configuration database.

Q: What is the minimum required mounting hole depth for flush installation?

A: Flush mounting requires a minimum counterbore depth of 18.5 mm to accommodate the probe body and ensure the sensing face is coplanar with the mounting surface. Do not exceed 0.05 mm deviation from flatness across the mounting surface. Use only the supplied stainless-steel locknut and torque to 12–15 N·m.