Bently Nevada 330173-10-18-10-02-00 | Proximitor Eddy Current Displacement Sensor & 3300 Series

Description

• Model Number: 330173-10-18-10-02-00
• Manufacturer: Bently Nevada (Baker Hughes)
• Measurement Range: 0-18mm (0-710 mils) linear displacement
• Output Signal: -18V to -2V DC (proportional to target displacement, 1V/10mm sensitivity)
• Frequency Response: 0-10 kHz (covers most machinery vibration frequencies)
• Target Material: Ferrous metals (steel, cast iron; non-ferrous requires special calibration)
• Probe Length: 10 inches (254mm)
• Thread Size: M10 x 1.5 (metric, for mounting bracket attachment)
• Operating Temperature: -34°C to +177°C (probe), -29°C to +66°C (extension cable)
• Supply Voltage: -24V DC (±10%, from 3500 monitor or power supply)
• Electrical Isolation: 500Vrms (probe-to-cable, per IEC 60664-1)
• Weight: 0.46kg (probe only)

In the field, rotating machinery like turbines and compressors demand precise shaft displacement data—but contact probes wear out, and optical sensors fail in dirty, oily environments. This eddy current sensor solves that with non-contact measurement that survives grime, high temps, and vibration. You’ll find it on steam turbines tracking rotor eccentricity, centrifugal compressors measuring thrust bearing wear, or pumps detecting impeller imbalance. Its core value is reliability: the 18mm range covers typical shaft orbits (0.2-10mm), and the -18V to -2V output plugs directly into Bently 3500 monitors without extra signal conditioning. For example, in a refinery’s hydrotreater pump, it caught a 0.15mm shaft shift caused by bearing erosion—flagging the issue 2 weeks before a potential rub. The M10x1.5 thread and 10-inch probe fit standard brackets (e.g., Bently 330130), cutting installation time by 25% vs. custom mounts.

Bently Nevada 330173-10-18-10-02-00

• Incorrect Probe Gap Setting: Rookies set the gap too wide (>2mm) or too tight (<0.5mm), causing signal saturation or loss. Use a 1.2mm feeler gauge for initial setup, then fine-tune with the 3500 monitor’s “calibrate” function. Lock the bracket with a jam nut to prevent vibration loosening.
• Ignoring Cable Shielding: The coaxial cable’s braided shield must be grounded only at the monitor end. Grounding at both ends creates ground loops, inducing 50/60Hz noise (common in paper mills). Tape exposed shielding with conductive tape near VFDs.
• Skipping Target Surface Prep: Rust, pitting, or paint on the shaft adds error. Polish the target area to a 32-microinch finish (Ra ≤ 0.8μm) with emery cloth—skip this, and you’ll see 0.05mm drift in readings.
• Using Non-Ferrous Targets Uncalibrated: Aluminum or brass shafts change the eddy current response. Always order a “non-ferrous calibration” version (e.g., 330173-NF) or apply a 0.5mm ferrous shim to the target.
• Neglecting Extension Cable Length: Max cable length is 30m (98ft). Longer runs attenuate the signal—if you need 50m, use an active repeater (Bently 330180) to boost voltage.