Bently Nevada 330425 Series Modules – 330425-01-CN Accelerometer Acceleration Transducer

Technical Dossier

Product Details And Specifications

Bently Nevada 330425 Series Technical Notes

The Bently Nevada 330425 Series represents a family of industrial-grade accelerometers and acceleration transducers engineered for continuous vibration monitoring in high-criticality rotating machinery applications. These sensors are deployed across global heavy industry sectors including petrochemical refineries, nuclear power stations, offshore platforms, and large-scale chemical processing facilities. The 330425 Series integrates directly with Bently Nevada 3500 Series rack-based machinery protection systems, providing 4–20 mA or voltage output signals compatible with DCS and PLC infrastructure. Their robust construction — stainless steel housings, hermetically sealed connectors, and wide operating temperature ranges — makes them a standard specification in API 670-compliant machinery protection installations worldwide.

The Evolution of 330425 Architecture

The 330425 Series was developed as part of Bently Nevada's broader strategy to standardize vibration sensing across its 3300 and 3500 platform ecosystems. Early-generation Bently Nevada accelerometers relied on charge-mode piezoelectric elements requiring external charge amplifiers, which introduced signal conditioning complexity in field installations. The 330425 Series transitioned to integrated electronics piezoelectric (IEPE) architecture — embedding signal conditioning circuitry directly within the transducer housing — eliminating the need for separate charge converters and reducing installation footprint.

330425 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified models within the Bently Nevada 330425 accelerometer family, classified by configuration and output type:

Accelerometer / IEPE Transducers — Standard Mount

• 330425-01-CN: IEPE accelerometer, integral cable, standard sensitivity, 100 mV/g, stud mount
• 330425-02-CN: IEPE accelerometer, integral cable, high-sensitivity variant, 500 mV/g output
• 330425-03-CN: IEPE accelerometer, integral cable, low-frequency optimized, 10 Hz–1 kHz range
• 330425-04-CN: IEPE accelerometer, integral cable, high-temperature rated, up to 121°C continuous
• 330425-05-CN: IEPE accelerometer, integral cable, hermetically sealed, IP68 rated for submerged environments
• 330425-06-CN: IEPE accelerometer, integral cable, triaxial configuration, simultaneous 3-axis measurement

Accelerometer / IEPE Transducers — Connector Termination

• 330425-01-00: IEPE accelerometer, 2-pin MIL connector, standard sensitivity, 100 mV/g
• 330425-02-00: IEPE accelerometer, 2-pin MIL connector, high-sensitivity, 500 mV/g
• 330425-03-00: IEPE accelerometer, 2-pin MIL connector, low-frequency optimized
• 330425-04-00: IEPE accelerometer, 2-pin MIL connector, high-temperature rated, 121°C

Accelerometer — Charge Mode (Legacy)

• 330425-07-CN: Charge-mode piezoelectric accelerometer, integral cable, requires external charge amplifier
• 330425-08-CN: Charge-mode accelerometer, high-temperature, rated to 260°C, for turbine casing applications

Mounting Accessories & Companion Hardware

• 330425-09-CN: Accelerometer with integral mounting base, pre-drilled stud pattern for API 670 compliance
• 330425-10-CN: IEPE accelerometer, explosion-proof housing, ATEX/IECEx Zone 1 certified
• 330425-11-CN: IEPE accelerometer, low-profile design, for space-constrained bearing housing installations
• 330425-12-CN: IEPE accelerometer, integral cable, EMI-shielded, for high electrical noise environments
• 330425-13-CN: IEPE accelerometer, stainless steel housing, seawater-resistant, offshore platform specification
• 330425-14-CN: IEPE accelerometer, integral cable, wide-band frequency response, 2 Hz–10 kHz
• 330425-15-CN: IEPE accelerometer, dual-output configuration, simultaneous velocity and acceleration signals

Quality Control for the 330425 Range

The 330425 Series presents specific quality verification challenges due to its IEPE signal conditioning circuitry and precision piezoelectric sensing elements. DriveKNMS applies a structured test protocol to each unit prior to dispatch:

• Bias voltage verification: IEPE output bias voltage measured against OEM specification (typically 8–12 VDC at rated supply current) to confirm internal amplifier circuit integrity.
• Sensitivity calibration check: Each unit subjected to controlled vibration excitation on a calibrated shaker table; output sensitivity (mV/g) verified against the model's rated specification within ±5% tolerance.
• Frequency response sweep: Swept-sine excitation from 10 Hz to 10 kHz to confirm flat response within the rated bandwidth and identify resonance anomalies indicative of damaged sensing elements.
• Cable and connector integrity: For -CN integral cable variants, full continuity and insulation resistance testing across the cable assembly; shield continuity verified to prevent common-mode noise ingress.
• Housing and seal inspection: Visual and dimensional inspection of stud mount threads, connector seating surfaces, and cable strain relief to confirm mechanical integrity prior to installation.