Bently Nevada 1669-20-05-01 Seismoprobe Magnetoelectric Velocity Transducer Product Specification
The 1669-20-05-01 is a factory pre-calibrated self-generating magnetoelectric seismic velocity transducer belonging to Bently Nevada classic 1669 Seismoprobe product family, specially designed for continuous absolute casing vibration measurement on bearing pedestals and equipment housings of various rotating machinery. Different from eddy current proximity probes which measure relative shaft-to-probe gap displacement, this transducer is mounted directly onto machine outer shell to capture overall casing vibration, converting mechanical vibration velocity into proportional alternating voltage output without any external excitation power supply. The segmented part number defines customized configuration parameters respectively: “20” stands for factory pre-terminated 20-meter integral stainless steel armored cable specification; “05” refers to preset internal coil winding and fixed impedance parameter optimized for direct matching with standard Bently monitoring modules; “01” denotes customized housing structure and dedicated mounting thread dimension for field installation. Compliant with API 670 international machinery protection specification, the sensor is widely deployed in thermal power, petrochemical refining, metallurgy and municipal water treatment industries for induced draft fans, boiler feed pumps, centrifugal compressors and small auxiliary steam turbines to monitor abnormal vibration resulting from rotor unbalance, shaft misalignment and progressive bearing wear.
Description
Bently Nevada 1669-20-05-01 Seismoprobe Magnetoelectric Velocity Transducer Product Specification
1. Product Overview
The 1669-20-05-01 is a factory pre-calibrated self-generating magnetoelectric seismic velocity transducer belonging to Bently Nevada classic 1669 Seismoprobe product family, specially designed for continuous absolute casing vibration measurement on bearing pedestals and equipment housings of various rotating machinery. Different from eddy current proximity probes which measure relative shaft-to-probe gap displacement, this transducer is mounted directly onto machine outer shell to capture overall casing vibration, converting mechanical vibration velocity into proportional alternating voltage output without any external excitation power supply. The segmented part number defines customized configuration parameters respectively: “20” stands for factory pre-terminated 20-meter integral stainless steel armored cable specification; “05” refers to preset internal coil winding and fixed impedance parameter optimized for direct matching with standard Bently monitoring modules; “01” denotes customized housing structure and dedicated mounting thread dimension for field installation. Compliant with API 670 international machinery protection specification, the sensor is widely deployed in thermal power, petrochemical refining, metallurgy and municipal water treatment industries for induced draft fans, boiler feed pumps, centrifugal compressors and small auxiliary steam turbines to monitor abnormal vibration resulting from rotor unbalance, shaft misalignment and progressive bearing wear.
2. Working Principle and Internal Construction
The transducer adopts fully enclosed moving-coil magnetoelectric core structure entirely encapsulated inside robust metal housing. A high-performance permanent magnet is rigidly fixed inside the sealed cavity to form a stable uniform magnetic field, while suspended induction coil moves synchronously with equipment casing vibration and cuts magnetic flux lines to generate alternating voltage linearly corresponding to real vibration velocity value, requiring no external preamplifier or auxiliary DC power source for normal signal output. The inner empty space of shell is fully filled with high-temperature resistant epoxy resin to block intrusion of industrial dust, floating oil mist and condensed moisture from harsh field environment. An accurately tuned mechanical damping component is embedded internally to suppress inherent self-resonance of the transducer itself, ensuring consistent linear signal output within designated working frequency range and extending long-term reliable service life under continuous equipment running condition.
3. Electrical and Metrological Performance Specifications
Every unit completes comprehensive full-frequency sensitivity calibration before factory delivery with standard nominal sensitivity of 100mV per inch per second, equivalent to approximately 3.94mV per millimeter per second. Its effective frequency response range covers 4.5Hz up to 2000Hz, fully covering fundamental rotating frequency and main harmonic vibration components of conventional industrial rotating equipment. Internal coil impedance is fixed according to the definition of suffix “05”, enabling direct wiring compatibility with Bently 3500/42 seismic monitor module, legacy 3300/44 vibration monitor and 1900 series standalone machinery monitor without additional impedance matching adapter circuit. The transducer outputs low-impedance alternating analog signal with outstanding anti-electromagnetic interference capability against clutter generated from nearby high-power frequency converters and heavy-current power cables. Under standard ambient working condition, full-scale measurement linearity error is controlled within ±3%. All matched backend monitoring instruments support automatic open-circuit and short-circuit diagnosis for sensor cable breakage or internal coil damage and output corresponding fault alert signals once abnormal status is detected.
4. Cable and Mechanical Mounting Specification
The code “20” represents fixed 20-meter integral stainless steel spiral armored outgoing cable preassembled at factory. Outer stainless steel spiral armor effectively protects inner insulated conductors from tensile force, surface abrasion and sharp object puncture during field cable routing and regular equipment maintenance; inner insulation material is formulated with excellent high-temperature and oil-resistant property to adapt high-heat surroundings near hot bearing housings. Suffix “01” defines sensor head outer dimension and exclusive mounting thread specification, allowing direct screwing fixation onto pre-machined mounting studs on bearing pedestal without extra customized installation brackets. The whole outer casing is made of anti-rust treated high-strength aluminum alloy with compact outline, suitable for installation in limited narrow space on various pump and fan base structures.
5. Environmental Operating Parameters
Permitted continuous operating ambient temperature ranges from -35℃ to +85℃; short-time intermittent peak working temperature can reach +95℃ to adapt transient high-temperature environment of auxiliary steam equipment. Rated applicable working relative humidity covers 5%RH to 98%RH under non-condensing condition, maintaining stable output performance in dusty workshop, oil mist atmosphere and mild corrosive gas surroundings. Allowable spare part storage temperature spans from -40℃ to +100℃ for long-term dry warehouse inventory preservation. The product has passed CE electromagnetic compatibility certification and industrial mechanical shock resistance test to withstand incidental collision and long-term ambient vibration impact from adjacent running rotating machines.
6. System Matching and Practical Application Guidance
Original alternating velocity signal from 1669-20-05-01 can be directly wired into Bently 3500 rack-mounted TSI monitoring system, traditional 3300 series monitoring rack and independent 1900 multi-function equipment monitors. Backend monitoring hardware converts raw velocity signal into displacement or acceleration data via built-in operational algorithm and supports programmable two-stage Alert pre-alarm and Danger shutdown threshold configuration for equipment safety interlock protection. Processed measurement data can be uploaded to central DCS and SCADA control system through monitor’s isolated 4–20mA analog output port; meanwhile unprocessed original sensor signal can be accessed by portable vibration data collector to carry out offline spectrum analysis and periodic predictive maintenance diagnosis. Typical application sites include boiler auxiliary fans and feedwater pumps in thermal power plants, process pumps and reciprocating compressors in petrochemical refineries, sintering exhaust blowers in metallurgical workshops and circulating water pumps for municipal environmental protection projects.
7. Factory Inspection and Warranty Terms
All finished transducers undergo full-frequency point sensitivity calibration, high-low temperature cyclic aging test and overall hermetic sealing tightness inspection before factory shipment to guarantee consistent batch product performance. Standard original manufacturer warranty period lasts twelve months calculated from product formal delivery date; free repair or replacement service is available for failures induced by inherent manufacturing defects under specified standard installation and normal working environment. Any damage resulting from artificial excessive cable bending, incorrect wiring connection, mechanical extrusion impact, chemical medium corrosion and over-temperature misuse is excluded from free warranty coverage.
Get a Quote