Bently Nevada 330425-02-05

Bently Nevada 330425-02-05

Product Introduction: The 330425 is a piezoelectric accelerometer with a larger measurement range than the 330400, designed for casing acceleration measurement on critical rotating machinery. It provides 75g peak acceleration range with 25 mV/g sensitivity, making it suitable for applications with higher vibration levels. The sensor meets API 670 requirements and is used for gear mesh monitoring, bearing diagnostics, and high-frequency vibration detection.

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Description

Bently Nevada 330425-02-05

Technical Specifications:

  • Sensitivity: 2.5 mV/m/s² (25 mV/g) ±5%
  • Acceleration Range: 735 m/s² (75g) peak total acceleration over 10 Hz to 15 kHz frequency range
  • Frequency Response: 10 Hz to 15 kHz (600 cpm to 900,000 cpm) ±3 dB; 30 Hz to 10 kHz (1800 cpm to 600,000 cpm) ±10%
  • Linearity: ±1% to 735 m/s² (75g) peak
  • Input Voltage: -24 ± 0.5 Vdc
  • Bias Current: 2 mA nominal
  • Output Bias Voltage: -8.5 ± 0.5 Vdc
  • Temperature Sensitivity: -11% to +3% typical over operating temperature range
  • Operating and Storage Temperature: -55°C to +121°C (-67°F to +250°F)
  • Shock Resistance: 49,050 m/s² (5000g) peak maximum
  • Relative Humidity: 100% condensing, non-immersion, sealed housing
  • Connector: 3-pin
  • Housing Material: 316L stainless steel
  • Mounting Thread: M8×1 (indicated by -02 suffix)
  • Agency Approvals: CSA, ATEX, IECEx (indicated by -05 suffix)

Functional Features:

  • Extended acceleration range (75g peak) for high-vibration applications
  • Lower sensitivity (25 mV/g) accommodates larger dynamic range without signal clipping
  • Wide frequency response from 10 Hz to 15 kHz for gear mesh and bearing diagnostics
  • API 670 compliant design
  • 316L stainless steel sealed housing for harsh environments
  • Multiple international hazardous area certifications (CSA, ATEX, IECEx)
  • Compatible with 3500/42M, 2300/20, and 1900/65A monitoring systems

Application Scenarios:

  • High-vibration environments where the 330400 range (50g) is insufficient
  • Gear mesh monitoring on heavily loaded gearboxes
  • Bearing vibration monitoring on large compressors and turbines
  • Applications in hazardous areas requiring ATEX/IECEx/CSA certification
  • Power generation, petrochemical, and refining facilities with high-energy machinery

Performance Parameters:

  • Sensitivity: 25 mV/g ±5%
  • Dynamic Range: 75g peak acceleration
  • Frequency Range: 10 Hz to 15 kHz (±3 dB)
  • Linearity: ±1% full scale

Material Composition: Piezoelectric ceramic crystal element in a 316L stainless steel sealed housing with 3-pin connector

Structural Features: Cylindrical accelerometer body with M8×1 mounting stud. The 3-pin connector is located at the top for cable connection. Hermetically sealed construction.

Working Principle: Identical to the 330400 operating principle. The piezoelectric crystal generates charge proportional to acceleration, converted to a voltage output by internal electronics. The lower sensitivity provides a wider dynamic range at the expense of resolution at low vibration levels.

Installation Requirements:

  • Mount on a clean, flat surface on the bearing housing or machine casing
  • Use M8×1 mounting stud with proper torque
  • Connect 3-conductor shielded cable (16710 or 16925 series)
  • Route cables away from high-voltage power sources
  • Ensure adequate structural rigidity of the mounting surface

Usage Notes:

  • The 330425 trades sensitivity for range compared to the 330400; select based on expected vibration levels
  • Incorrect mounting degrades performance and produces false signals
  • Verify -24 Vdc power supply before operation
  • The -05 suffix confirms CSA, ATEX, and IECEx certifications for hazardous area installation
  • Use only Bently Nevada approved cables

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