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The 330400-02-CN by Bently Nevada is a piezoelectric acceleration transducer for industrial machinery applications requiring casing acceleration measurements, including gear mesh vibration monitoring. This hardware satisfies the hardware requirements of the American Petroleum Institute (API) Standard 670 for accelerometers. The module converts physical casing vibrations into electrical signals, delivering a calibrated amplitude range of 490 m/s² (50 g) peak and a nominal sensitivity of 10.2 mV/m/s² (100 mV/g).
Built for continuous high-frequency bearing and gear mesh vibration monitoring
Features the -CN suffix for safe deployment in domestic explosive zones
Equipped with -02 studs to prevent high-frequency signal attenuation
This specific hardware variant integrates a 3-pin top-threaded physical connector on its upper housing, establishing a secure link with shielded instrumentation cables. Under the -02 option specification, the base of the sensor is machined to receive a 1/4-28 UNF mounting stud, enabling direct mechanical attachment onto the flat metal surfaces of rotating machinery bearing housings. The unit operates via constant-current loop powering, providing bias voltage stabilization within a broad operating frequency range from 10 Hz to 15 kHz.
The 330400-02-CN utilizes a hermetically sealed 316L stainless steel enclosure that isolates the internal piezoelectric crystal elements from industrial moisture and dust. Under the -CN suffix classification, the hardware carries official regulatory certifications in compliance with Chinese explosion-proof safety standards, verifying its suitability for installation within hazardous areas on the factory floor. The structural encapsulation provides mechanical protection against alternating environmental stresses during continuous machine vibration monitoring.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Bently Nevada 330400-02-CN Accelerometer Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Petrochemical & Refining
Installed on the gearboxes of high-speed centrifugal compressors in hydrogenation and catalytic cracking units. It utilizes M8 studs for rigid mounting to precisely monitor high-frequency vibrations caused by gear meshing.
Large-Scale Wind Power
Deployed on multi-stage speed-increasing gearboxes and main generator bearing housings inside wind turbine nacelles. It captures real-time impact acceleration signals caused by early pitting or spalling of rolling element bearings.
Thermal Power Plants
Used for housing monitoring of rolling element bearings on boiler feedwater pump sets and high-pressure induced draft (ID) fans. Its certified characteristics ensure safe, long-term operation under high-temperature and high-vibration power plant environments.
Air Separation & Industrial Gases
Applied on the pinion bearing housings of each stage in integrally geared compressors within large air separation units. It delivers lossless transmission monitoring of high-frequency casing vibration to prevent impeller rubs.
Gas Turbine Power Generation
Mounted on gas turbine auxiliary gearboxes, turning gears, and generator front bearing pedestals. It satisfies API 670 hardware specifications for continuous monitoring of absolute casing vibration at high rotational speeds.
When operating the Bently Nevada 330400-02-CN, mechanical installation requires a calibrated torque wrench to precisely tighten the M8 stud (-02 option) to 4.5 N·m (40 in·lb), ensuring absolute rigid contact with the machine casing to prevent high-frequency signal attenuation or thread stripping.
Meanwhile because this hardware is deployed in high-risk environments containing flammable gases or dusts (-CN option, NEPSI certified zone), any physical removal or wiring maintenance must be conducted with the front-end system power completely disconnected, and the three-wire shielded cable (A-Power, B-Common, C-Signal) must be routed in strict compliance with intrinsic safety standards to eliminate spark release from open or short circuits.
330400-02-CN features the -02 suffix representing its containment of an M8 × 1.25 threaded mounting stud option used for direct rigid physical fixation between the sensor base and the machine casing to ensure the lossless transmission of high-frequency vibration. Furthermore, the -CN suffix denotes that the hardware has passed localized explosion-proof compliance certifications by the National Supervision and Inspection Center for Explosion Protection and Safety of Instrumentation (NEPSI) in China [|], supporting safe deployment and intrinsically safe operation within domestic Chinese industrial sites containing flammable and explosive gases or dusts, such as petrochemical and power plants.
It is an industrial piezoelectric accelerometer sensor used to measure high-frequency casing vibration on surfaces like rotating machinery bearing housings.
Which proximitor or monitor card should the 330400-02-CN be connected to?
It is typically linked via a dedicated cable to the seismic input channels of a Bently Nevada 3500/42M or 3500/44M monitoring system.
How to physically install the 330400-02-CN onto a machine bearing housing?
A hole must be drilled and tapped with a 1/4-28 UNF thread on the machine surface, after removing burrs, screw the sensor base vertically using specified torque.
hat are the maximum and minimum vibration frequencies measurable by the 330400-02-CN?
The frequency response range of this hardware covers 10 Hz to 10,000 Hz (10 kHz).
What material is used for the sensor housing to withstand harsh environments?
The casing is fabricated from 316L stainless steel and utilizes a hermetically welded seal to isolate field moisture and corrosive media.
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