Bently Nevada 16639-02 Seismoprobe Self-Generating Velocity Transducer Product Specification
The 16639-02 belongs to Bently Nevada classic 16639 Seismoprobe passive moving-coil velocity transducer series, an upgraded compact-size magnetoelectric vibration sensor designed for continuous absolute casing vibration measurement on bearing housings, motor bases and rotating equipment shells of fans, feed pumps, compressors and auxiliary steam turbines across thermal power, petrochemical and metallurgical industries. Distinct from eddy-current proximity probes measuring relative shaft gap, this transducer is rigidly fixed on equipment outer casing to capture overall structural vibration and convert mechanical vibration speed into proportional AC voltage output with zero external DC excitation power required. The suffix "-02" defines customized mechanical mounting and wiring configuration of the unit, differentiating from alternative 01 specification variant in thread dimension and outgoing terminal layout. Compliant with API 670 machinery protection standard, the sensor cooperates with Bently 3500/42 seismic monitor module, legacy 3300/44 vibration monitor and standalone 1900 series monitoring instruments to realize early warning of rotor unbalance, shaft misalignment and progressive bearing abrasion faults.
Description
Bently Nevada 16639-02 Seismoprobe Self-Generating Velocity Transducer Product Specification
1. Product Overview
The 16639-02 belongs to Bently Nevada classic 16639 Seismoprobe passive moving-coil velocity transducer series, an upgraded compact-size magnetoelectric vibration sensor designed for continuous absolute casing vibration measurement on bearing housings, motor bases and rotating equipment shells of fans, feed pumps, compressors and auxiliary steam turbines across thermal power, petrochemical and metallurgical industries. Distinct from eddy-current proximity probes measuring relative shaft gap, this transducer is rigidly fixed on equipment outer casing to capture overall structural vibration and convert mechanical vibration speed into proportional AC voltage output with zero external DC excitation power required. The suffix "-02" defines customized mechanical mounting and wiring configuration of the unit, differentiating from alternative 01 specification variant in thread dimension and outgoing terminal layout. Compliant with API 670 machinery protection standard, the sensor cooperates with Bently 3500/42 seismic monitor module, legacy 3300/44 vibration monitor and standalone 1900 series monitoring instruments to realize early warning of rotor unbalance, shaft misalignment and progressive bearing abrasion faults.
2. Internal Structure & Operating Principle
This transducer adopts fully hermetically sealed moving-coil magnetoelectric core structure with high-strength rustproof alloy housing, inner cavity completely filled with high-temperature epoxy resin to block invasion of industrial oil mist, dust and condensed moisture under severe working surroundings. High-stability permanent magnet is fixed inside sealed shell to build uniform magnetic field, while induction coil suspended by precision spring components follows casing vibration to cut magnetic flux and generate alternating voltage linearly proportional to actual vibration velocity based on electromagnetic induction principle. Built-in precision mechanical damping assembly effectively suppresses inherent self-resonance of the transducer itself, stabilizing signal linearity within full specified frequency range and extending continuous service lifespan under long-term uninterrupted equipment operation. No built-in amplification circuit is equipped inside the sensor body, featuring passive signal output design for strong anti-electromagnetic interference against nearby frequency converters and high-current power cables.
3. Electrical & Metrology Technical Parameters
Factory pre-calibrated nominal sensitivity is fixed at 100mV/in/s (equal to approximately 3.94mV/mm/s), full-scale linear measurement error controlled within ±3% under standard ambient condition. Effective working frequency response covers 4.5Hz~2000Hz, fully covering fundamental rotating frequency and main harmonic vibration components of conventional industrial rotating machinery. Internal coil impedance is factory preset for direct matching with standard Bently seismic monitoring card without extra impedance matching adapter, low-impedance analog AC output facilitates long-distance field wiring and supports backend monitor’s automatic open-circuit and short-circuit fault diagnosis for broken cable or internal coil damage with corresponding fault alarm signal output. Transverse sensitivity is limited below 5% of axial nominal sensitivity to avoid cross-direction vibration interference during measurement.
4. Mechanical & Mounting Specification for Code -02
Suffix “02” stands for standard stud-mount installation configuration: the sensor base is equipped with industry-standard external mounting thread, allowing direct screwing onto pre-processed mounting studs on bearing pedestal without additional customized fixing brackets. The unit adopts short fixed lead outgoing design instead of integrated armored cable, terminal part is reserved for field pairing with user-specified shielded signal cable, which brings flexible cable length selection for diversified on-site wiring layout. The whole outer housing is compact machined alloy structure with small outline dimension, applicable for narrow installation space of pump and fan base limited by equipment structure; overall unit weight is around 230g for convenient on-site fixation and overhaul disassembly.
5. Environmental Working Specifications
Permitted continuous working ambient temperature ranges from -35℃ to +88℃, short-time intermittent peak temperature can reach +96℃ to adapt transient high-temperature working environment of thermal auxiliary equipment. Rated applicable relative humidity is 5%RH~98%RH under non-condensing environment, maintaining stable output performance in dusty, oil-fog and weak corrosive gas industrial workshops. Product storage temperature spans -40℃~+102℃ for long-term dry warehouse stock preservation. Finished product passes CE EMC certification and industrial mechanical impact test to resist occasional collision and persistent ambient vibration impact from adjacent operating rotating equipment.
6. System Matching & Application Instruction
Original velocity analog signal from 16639-02 can be directly wired into Bently 3500 rack-based TSI protection system, traditional 3300 series monitoring rack and independent 1900 multi-function machinery monitor. Backend monitoring hardware converts raw velocity signal into displacement or acceleration data via internal operational algorithm, supports programmable two-stage Alert pre-alarm and Danger shutdown threshold setup for equipment safety interlock protection. Processed measured data can be uploaded to central DCS and SCADA control system through monitor’s isolated 4–20mA analog output channel; meanwhile original sensor signal can be accessed by portable vibration collector to implement offline spectrum analysis and regular predictive maintenance diagnosis. Typical application occasions include boiler induced draft fans and feedwater pumps in thermal power plants, process pumps and small centrifugal compressors in petrochemical refining factories, exhaust blowers in metallurgy sintering workshops and circulating water pumps for municipal environmental protection projects.
7. Factory Inspection & Warranty Regulation
Every finished transducer completes full-frequency sensitivity calibration, high-low temperature cyclic aging test and full hermetic tightness inspection before factory delivery to guarantee consistent batch performance stability. Standard original manufacturer warranty lasts twelve months counting from product delivery date; free maintenance or replacement service is available for equipment damage caused by inherent manufacturing defects under specified standard installation and normal working environment scope. Damage induced by artificial excessive bending of wiring, wrong wiring connection, mechanical extrusion impact, chemical medium erosion and over-temperature misuse is excluded from free warranty coverage.
Get a Quote