Bently Nevada 330195‑02‑12‑05‑05 3300‑XL 8 mm ETR Reverse‑Mount Eddy‑Current Proximity Probe (Multi‑Hazardous‑Area Approvals)

Description

Bently Nevada 330195‑02‑12‑05‑05

3300‑XL 8 mm ETR Reverse‑Mount Eddy‑Current Proximity Probe (Multi‑Hazardous‑Area Approvals)

Product Overview

The 330195‑02‑12‑05‑05 is a reverse‑mount eddy‑current proximity probe belonging to the Bently Nevada 3300‑XL 8 mm ETR (Extended Temperature Range) Microdot transducer family. The reverse‑mount mechanical design enables probe gap adjustment and replacement from the rear side of bearing housing without complete machine disassembly. Built with high‑temperature rated insulation components, this probe converts shaft‑to‑tip clearance into proportional voltage signal for shaft‑relative radial vibration, static thrust position and Keyphasor rotational speed / phase reference measurements. It fully complies with API‑670 turbomachinery protection standards. The final ‑05 suffix provides multi‑agency ATEX, IECEx and CSA intrinsic‑safety certifications for explosive hazardous‑area installation.

Critical Compatibility Warning

• This is legacy ETR Microdot interface probe. Only interoperable with 3300‑XL ETR‑qualified Microdot extension cables (330190 series). NOT compatible with NSv ClickLoc (330930 series) or standard‑temperature 330130 series cables.
• Total calibrated transducer system length = probe integral pigtail length + matched ETR extension cable length. The summed length must strictly follow the length setting of paired ETR‑compliant proximitor unit. Length mismatch will cause scale‑factor deviation and measurement inaccuracy.
• Termination: straight Microdot 10‑32 coaxial connector. Do not cut, splice or modify factory‑molded probe‑pigtail assembly. Always verify intrinsic‑safety physical label before hazardous‑zone deployment.

Part Number Decoding

• 330195：Base model, 3300‑XL 8 mm ETR reverse‑mount proximity probe
• ‑02：Mounting thread: 3/8‑24 UNF
• ‑12：Probe housing overall length: 120 mm
• ‑05：Integral non‑armored ETR pigtail cable length: 0.5 meter
• ‑05：Agency approval option: ATEX / IECEx / CSA multi‑hazardous‑area intrinsic‑safety approvals

330195-02-12-05-05

Key Specifications

Main Features

• Reverse‑mount mechanical structure: Serviceable from machine housing rear side; probe gap adjustment or replacement without disassembling turbomachinery casing, simplifies overhaul and maintenance workflow.
• ETR extended‑temperature‑range construction: High‑temperature FEP insulated integral pigtail, suitable for locations with high radiant heat where standard‑grade probes cannot survive continuous thermal exposure.
• 3/8‑24 UNF thread & 120 mm housing dimension: Standard mechanical interface for reverse‑mount shell assemblies widely adopted on turbine and compressor bearing housings.
• 0.5 m factory‑calibrated non‑armored ETR pigtail with straight Microdot connector: Matches 330190 series ETR tri‑axial extension cables to build required total transducer‑loop length.
• Multi‑agency hazardous‑area intrinsic‑safety certifications (‑05 suffix): Qualified for petrochemical, refinery and oil‑gas classified explosive‑zone sites.
• Excellent temperature stability and linear performance: Resists oil‑mist, humidity and continuous machinery vibration, satisfies API‑670 protection requirements for critical rotating equipment.
• Full interoperability within 3300‑XL ETR Microdot transducer ecosystem.

Typical Application Scenarios

• Shaft‑relative radial‑vibration and axial thrust‑position protection monitoring for high‑heat steam turbines, gas turbines and centrifugal compressors equipped with reverse‑mount probe housing
• Keyphasor phase reference and shaft rotational‑speed detection for fluid‑film‑bearing rotating machinery operating under elevated ambient temperature
• Refinery, petrochemical and power‑plant projects requiring both ETR high‑temperature rating and ATEX / IECEx hazardous‑area certifications for Microdot proximity transducers
• New‑project integration with Bently Nevada 3500 rack ETR‑qualified Microdot proximitor channels
• Spare‑part replacement for existing reverse‑mount high‑temperature Microdot proximity measurement loops

Related & Recommended Alternative Models

Compatible Components & Accessories

1. ETR Extension Cables: 330190 series ETR Microdot tri‑axial extension cables (straight / right‑angle versions)
2. Monitoring Hardware: ETR‑compliant 330180‑xx‑00 proximitor modules, Bently Nevada 3500 rack ETR‑qualified Microdot monitor channels
3. Mechanical Accessories: Reverse‑mount probe housing assembly, 43501‑02‑04‑02 low‑pressure cable‑seal assembly, 43574‑04 multi‑hole grommet
4. Installation Consumables: Anti‑seize compound for mounting threads, cable clamps for strain‑relief, high‑temperature cable ties
5. Tooling: Specified‑torque Microdot connector tightening tool
6. Calibration Tool: 8 mm 3300‑XL Microdot static gap calibration fixture

Installation and Configuration Guide

Warning: Installation must be performed by qualified instrument technicians. Always refer to original Bently Nevada 3300‑XL ETR transducer‑system manual as primary reference. Verify intrinsic‑safety marking before deployment in explosive classified hazardous zones.

1. Pre‑installation Total‑Length Calculation
   • Calculate total transducer length = probe integral ETR pigtail (0.5 m) + selected ETR extension‑cable length.
   • Confirm total length strictly matches calibrated‑length requirement of paired ETR‑qualified proximitor. Length mismatch causes scale‑factor error.
2. Reverse‑Mount Mechanical Installation
   • Install matching reverse‑mount probe housing assembly onto machine bearing housing according to mechanical drawing.
   • Apply anti‑seize compound to 3/8‑24 UNF probe thread; insert probe from housing rear side, adjust working gap to target value, tighten lock‑nut to specified torque.
   • Ensure probe tip maintains safe clearance and no physical contact with rotating shaft surface.
3. Cable Routing & Microdot Connector Mating
   • Route ETR tri‑axial cable separately from high‑power AC, VFD and contactor wiring to minimize EMI noise interference.
   • Observe minimum static bending radius ≥50 mm; avoid sharp kinks. Never pull cable assembly by Microdot connector body.
   • Clean Microdot contact pins; align keyway and tighten to manufacturer‑specified torque value. Do not over‑torque connector.
   • Mount strain‑relief clamps adjacent to connector joint. Where cable penetrates machine casing, install approved cable‑seal fitting.
4. System Commissioning
   • Complete full transducer‑loop assembly and power‑up proximitor / monitoring rack.
   • Read static gap voltage to verify mechanical gap setting. Perform static‑gap calibration test with 8 mm Microdot calibration fixture to validate system scale‑factor.
   • Clear Not‑OK fault status; configure alarm and trip thresholds per project machinery specification.
5. Maintenance & Troubleshooting
   • During machinery turnaround, inspect probe locking torque, Microdot connector for oil contamination and corrosion; check ETR FEP jacket for thermal embrittlement, cracking or oil‑swelling.
   • Gap‑voltage drift, high noise level or persistent Not‑OK faults may result from loose Microdot joint, mechanical gap shift, cable thermal ageing damage or incorrect total transducer‑loop length.
   • Replace complete factory probe assembly upon pigtail or probe tip damage; field‑splicing of integral ETR pigtail cable is strictly prohibited.

Supplementary Remark

330195‑02‑12‑05‑05 is a reverse‑mount 3300‑XL 8 mm ETR high‑temperature Microdot eddy‑current proximity probe with 3/8‑24 UNF thread, 120 mm housing, 0.5 m ETR integral pigtail and ATEX/IECEx/CSA multi‑hazardous‑area intrinsic‑safety certifications. It is designed for rear‑side serviceable high‑temperature turbomachinery bearing‑housing installation, only compatible with ETR‑qualified Microdot components and cannot connect to NSv ClickLoc hardware. Before commissioning, cross‑check reverse‑mount housing requirement, ETR specification, total transducer‑loop length, Microdot interface and hazardous‑area certification against project BOM and mechanical drawings.