Bently Nevada 3300XL 11mm Eddy Current Proximity Probe Specification

330104-00-05-10-02-00 is a standard 11mm eddy current non-contacting proximity probe from Bently Nevada 3300XL transducer family under Baker Hughes, designed to pair with 330180 series matching preamplifiers and 3500 rack monitor modules to constitute complete shaft vibration and displacement measuring system for turbomachinery TSI protection. The part number coding defines customized mechanical and electrical specifications sequentially: 00 stands for zero exposed tip length, 05 indicates 50mm stainless steel housing length, 10 represents 1.0 meter factory-integrated primary cable, 02 refers to ClickLoc miniature quick-disconnect coaxial connector at cable tail, and suffix 00 means standard general industrial version without special hazardous area certification. Based on high-frequency eddy current induction principle, the probe converts clearance fluctuation between probe tip and metallic rotating target into proportional voltage variation, enabling wear-free continuous online measurement of shaft radial vibration, axial thrust position and Keyphasor trigger signal. It complies strictly with API 670 rotating machinery protection standard and CE EMC requirements, widely deployed across thermal power, petrochemical, offshore oil & gas and metallurgical industries for steam turbines, gas turbines, centrifugal compressors and large auxiliary pump supervision. Every finished unit passes full-span linear calibration, temperature cycling aging and insulation withstand inspection before factory release to secure consistent measuring accuracy under harsh industrial field conditions.

When driven by high-frequency excitation signal output from matched preamplifier, internal coil of the probe generates alternating magnetic field; induced eddy current on the conductive rotor target changes coil impedance linearly as target clearance shifts, and the preamplifier converts impedance change into standardized negative DC output for subsequent data processing on 3500 monitor cards. The 11mm probe features nominal fixed sensitivity of 3.94 V/mm with standard effective linear clearance ranging from 0.50 mm up to 4.50 mm, and the recommended optimum installation operating gap is set at 2.50 mm, positioned near the midpoint of linear span to minimize measurement drift during equipment thermal expansion and operational vibration. High-temperature PPS probe tip plus internal sealed Viton elastomer sealing structure resists erosion from onsite lubricant mist, condensed water and weak chemical volatile vapors inside bearing housings and high-temperature equipment enclosures, ensuring long-term stable continuous service. The ClickLoc 02-style tail connector adopts anti-vibration locking design to avoid loose contact induced by sustained machinery oscillation, and double-shielded integrated cable suppresses electromagnetic interference originating from nearby variable frequency drives and high-power motors to prevent signal distortion and measuring deviation. When cooperating with 3500 series monitor modules, users configure measurement range, Alert warning and Danger trip thresholds via official 3500 configuration software without any physical hardware modification on probe body. Once measured physical value exceeds preset limit, the system sends interlock instruction via 3500/32 relay modules to trigger local alarm or unit emergency shutdown for avoiding rotor-to-stator rub and catastrophic mechanical failure. Besides routine vibration and thrust displacement monitoring, this probe can also be mounted as Keyphasor pickup to capture once-per-revolution reference pulse for rotor phase, eccentricity and rotational speed calculation.

The probe assembly consists of three core components: stainless steel threaded housing, high-temperature insulated measuring tip and factory molded integral shielded cable. The housing is precision machined from AISI304 stainless steel with standard M14×1 external mounting thread, compatible with standard lock nuts and customer-designed installation brackets; the 05 specification corresponds to 50mm overall housing length for moderate space installation demands. Front measuring tip is made of dimensional-stable polyphenylene sulfide (PPS) to resist thermal deformation under fluctuating ambient temperature and guarantee stable linear performance across working temperature range; internal coil assembly is fixed by high-temperature epoxy potting compound to eliminate internal core shift caused by long-term mechanical vibration. The 10 coding corresponds to fixed 1.0-meter non-armored factory seamless integrated cable with no intermediate splice, terminated by 02-type ClickLoc coaxial connector for direct plug-in connection to preamplifier input port without extra transition wiring. Compression sealed transition between cable root and metal housing blocks ingress of onsite oil, moisture and dust into internal coil cavity to avert internal short-circuit damage. Finished spare probes are individually packed with anti-static plastic pouch and shock-absorbing foam padding to prevent shell scratch, cable over-bending and connector damage during cross-region shipment and long-term warehouse storage.

All probe loop is factory pre-calibrated for standard 50-ohm characteristic impedance matching required by 330180 preamplifier, ensuring consistent system sensitivity and linearity across the full measuring span. Full effective linear clearance range is 4.00 mm from 0.5 mm minimum up to 4.5 mm maximum target gap, corresponding DC output varies linearly roughly from approximately -1 VDC to -16.7 VDC, and full-scale linearity error is strictly controlled within ±1.25% FS after factory precision calibration. Insulation resistance between internal coil conductor and outer stainless steel housing surpasses 200MΩ under 500VDC dielectric withstand test to meet industrial electrical safety requirements. Double-layer shielded cable delivers outstanding anti-interference capability against common-mode surge and stray field coupling noise from field long-distance wiring. The complete measuring chain of probe plus preamplifier can extend overall system length flexibly by adding 330130 series extension cables per site layout needs to realize remote preamplifier arrangement outside high-temperature bearing compartments. Processed analog voltage signal from preamplifier is transmitted to 3500 monitor input terminals, which further converts raw measurement into standard 4–20mA analog output for remote data uploading to DCS and PLC centralized control systems for real-time indication and historical trend recording.

Continuous rated operating temperature range for probe body installed near equipment casing is -31°C ~ +121°C, permitting short-duration transient peak temperature up to +135°C during temporary abnormal equipment overheating. Safe storage temperature range for unused spare probes is -40°C ~ +85°C inside dry, airtight, dust-free warehouse without corrosive liquid splash and harmful chemical vapor accumulation. Allowable working relative humidity spans 5%RH to 95RH under strict non-condensing condition, well suited for high-humidity coastal petrochemical workshops and offshore platform cabinet environments with salt fog and persistent oil vapor atmosphere. The product passes standardized industrial vibration qualification test and withstands continuous sweep vibration of 10Hz~1500Hz without internal coil detachment, epoxy cracking or cable root loosening during long-term unit operation. The suffix 00 denotes general-purpose non-intrinsically-safe version, not certified for direct installation inside ATEX Zone2 or Class I Division2 hazardous areas; intrinsic safety barrier accessories shall be equipped separately if deployed inside explosion classified cabinet environments in accordance with local area electrical codes.

330104-00-05-10-02-00 must be matched with original Bently Nevada 330180 series preamplifiers and optional 330130 extension cables to form a full valid measuring loop; it is fully mechanically and electrically compatible with complete 3500 system products including 3500/05 instrument rack, 3500/40 proximity vibration monitor, 3500/45 differential expansion monitor, 3500/32 relay output module and 3500/92 communication gateway card. All configuration of measuring range, warning and trip limit parameters is completed via dedicated Bently Nevada 3500 configuration software with no mandatory hardware alteration on probe hardware. Primary applicable industries include coal-fired and gas-fired power generation, onshore & offshore crude oil refining, coal chemical processing and heavy metallurgy, mainly utilized for radial bearing vibration, rotor axial thrust displacement and Keyphasor pulse collection of large steam turbine, heavy-duty gas turbine and multistage centrifugal compressor units. Real-time measured data provides critical reference for unit startup curve formulation, variable load optimization and early mechanical fault pre-alarm to reduce unplanned shutdown risks induced by excessive rotor displacement and abnormal vibration.

Every finished probe undergoes multiple mandatory pre-delivery testing items including full-span linearity verification, high-low temperature alternating cycling aging test, cable insulation resistance inspection and connector pull force durability test to screen latent manufacturing defects before outbound delivery. Original manufacturer provides twelve months limited warranty starting from formal delivery date to end user; free replacement or repair service is available for products confirmed with inherent factory production defects when installed and operated within rated environmental conditions and standard mounting specifications throughout valid warranty period. Any probe damage arising from unauthorized internal disassembly modification, artificial violent mechanical impact, excessive sharp bending of integrated cable, incorrect wiring leading to overvoltage burnout and long-term continuous operation exceeding rated temperature limits is excluded from factory warranty coverage, with all associated maintenance and replacement costs fully borne by end customer.