Bently Nevada 330980‑51‑05 — 3300‑XL 11 mm Proximitor® Sensor

Description

Bently Nevada 330980‑51‑05 — 3300‑XL 11 mm Proximitor® Sensor

Product Overview

The 330980‑51‑05 is a proximitor sensor from Bently Nevada 3300‑XL 11 mm eddy‑current transducer family, with 5‑meter total system length, DIN‑rail mounting and multi‑hazardous‑area certifications. It is the signal‑conditioning unit for large‑gap non‑contact proximity measurement systems. It converts impedance changes between probe tip and metallic rotating target into calibrated DC gap‑voltage output for static position and dynamic vibration monitoring. This unit complies with API 670 machinery‑protection standards and is designed for applications requiring larger mechanical installation clearance compared to the standard 8 mm transducer series.

330980-51-05

Specific Application Information

Used together with matched 3300‑XL 11 mm proximity probe and extension cable for non‑contact measurement on metallic rotating shafts:

1. Radial shaft vibration monitoring: AC component of output captures shaft vibration amplitude for journal bearing health diagnosis.
2. Axial thrust / shaft position measurement: DC gap‑voltage tracks static thrust‑shaft displacement to detect thrust bearing wear.
3. Keyphasor® speed & phase reference: Cooperates with notch probe to generate tachometer pulses for RPM calculation and rotor phase analysis.
4. Retrofit spare part: Drop‑in replacement for legacy 3300‑XL 11 mm loops with 5 m total system cable length, applied where larger probe‑to‑target clearance is required.

Key Specifications

Main Features

• 11 mm large‑gap transducer system: 4 mm linear range provides larger mechanical installation tolerance, suitable for applications with greater shaft‑to‑probe clearance requirements.
• 5‑meter matched total‑system length: Probe cable plus extension cable must sum to exactly 5 m to guarantee correct scale factor.
• API‑670 compliant: Optimized for turbomachinery protection, stable linear output under industrial electrical disturbance.
• Dual‑mount design: Clip‑on 35 mm DIN‑rail for dense cabinet layout; bulkhead mounting holes support legacy footprint retrofit.
• Built‑in diagnostic functions: Not‑OK / Signal‑Defeat circuit prevents false alarms caused by open circuit, short‑circuit or loose coaxial connections; Power‑Up Inhibit avoids false trips during power‑on transients.
• Dual signal outputs: Terminal‑block DC gap‑voltage for monitor rack; coaxial PROX‑OUT port outputs raw dynamic vibration waveform for oscilloscope or portable diagnostic instruments.
• Potted rugged construction: High resistance to humidity, cabinet vibration and shock, fit for petrochemical, power plant and offshore environments.
• Test‑input pin: Allows loop simulation test by injecting simulated gap signal, no mechanical adjustment on machine shaft during commissioning.
• Intrinsic‑safety hazardous‑area ratings: ATEX / IECEx Ex ia IIC certification for Zone 0 / Zone 1 hazardous locations.
• Integrated isolation base: 500 Vrms isolation between unit and DIN‑rail, no extra insulating mounting plate needed.

Typical Application Scenarios

• Steam / gas turbine protection where larger probe installation clearance is required
• Centrifugal compressors in refinery, petrochemical and LNG facilities
• Large critical pumps, fans, blowers and fluid‑film‑bearing motors with larger mechanical tolerances
• Off‑shore platform rotating‑machinery condition‑monitoring loops
• Heavy‑duty rotating equipment in steel‑mill and pulp‑and‑paper industries
• Hazardous‑area classified sites requiring ATEX / IECEx intrinsic‑safety certification
• Retrofit and spare‑part replacement for existing 5‑m 3300‑XL 11 mm proximity measurement loops

Related & Recommended Alternative Models

Compatible Components & Accessories

1. 3300‑XL 11 mm proximity probes: e.g. 330903‑xx‑xx‑xx‑xx‑xx series, must belong to 11 mm transducer family for 5 m total‑system configuration.
2. Matched 3300‑XL extension cables: 330930‑xx‑xx‑00 series; probe cable + extension cable total length = 5 m.
3. Bently Nevada monitor modules: 3500/42M, 3300/12, 3300/15 monitor racks for gap‑voltage acquisition, alarm and trip logic.
4. Shielded twisted‑pair field wiring: 22 AWG shielded cable for power and signal; single‑end shield grounding only at monitor‑rack side.
5. 35 mm standard DIN‑rail: for cabinet DIN‑clip installation.
6. Calibration test fixture: static gap‑calibration tool for commissioning and periodic maintenance verification.

Installation and Configuration Guide

Warning: Installation must be performed by qualified instrumentation technicians. Always refer to original Bently Nevada 3300‑XL official user manual as primary authority.

1. Mechanical Mounting
   • Install proximitor inside clean, ventilated instrument cabinet; avoid mounting beside high‑power contactors or variable‑frequency drives to minimize EMI interference.
   • Snap unit onto standard 35 mm DIN‑rail or fasten through bulk‑head mounting holes. Ensure isolation base is fully seated; reserve peripheral clearance for heat dissipation.
2. 5‑Meter System‑Length & Transducer‑Family Matching
   • Confirm that probe and extension cable are 11 mm series parts, not 8 mm series. Total length of probe cable plus extension cable must equal exactly 5 meters. Mismatched family or length will cause measurement failure.
   • Torque coaxial connectors to manufacturer‑specified torque value; avoid over‑tightening. Do not connect / disconnect coaxial cables while power is applied.
3. Electrical Wiring
   • Supply negative‑polarity DC power: ‑17.5 VDC ~ ‑26 VDC to power terminals. Positive‑polarity supply will permanently damage the proximitor.
   • Deploy shielded twisted‑pair for power and signal wiring. Connect cable shield only at monitor‑rack end, leave shield floating at proximitor side to eliminate ground‑loop noise.
   • Terminate PROX‑OUT coaxial port to diagnostic instrument when dynamic waveform capture is needed; cap unused PROX‑OUT connector.
4. Commissioning & Gap‑Voltage Adjustment
   • Adjust mechanical probe installation gap to nominal mid‑range working point (target gap voltage approx. ‑10 VDC for AISI‑4140 steel target).
   • Measure DC gap‑voltage between SIG and COM terminals with high‑impedance multimeter, confirm operating point lies within linear zone (‑1 VDC ~ ‑17 VDC).
   • Perform static gap calibration; validate Not‑OK fault indication by simulating probe open‑circuit failure.
5. System Integration
   • Feed DC gap‑voltage output to Bently Nevada monitor channel. Configure monitor scale factor to 3.94 V/mm (100 mV/mil). Set alarm and trip thresholds following machinery OEM specification.
   • Use Test‑Input pin to inject simulated gap signal for loop‑function test without machine intervention.
6. Maintenance & Troubleshooting
   • Periodically inspect coaxial connections for looseness or corrosion.
   • Monitor Not‑OK status flag; Not‑OK assertion indicates failure of probe, extension cable or connector.
   • Internal potted assembly cannot be repaired in‑field; replace complete unit upon hardware fault.
7. Hazardous‑Area Special Requirement
   • For Ex ia IIC hazardous‑area installation, strictly comply with ATEX / IECEx rules for cable type, grounding and enclosure rating.

Supplementary Remark

330980‑51‑05 is mature 3300‑XL 11 mm large‑gap series hardware, widely used as spare‑part for global existing turbomachinery assets. Before site deployment, cross‑verify nameplate marking, transducer family, total‑system‑length marking and agency approvals.