Bently Nevada 330425-01-05 Proximity Transducer System

Description

These accelerometers are specifically designed for critical machinery applications, such as gear mesh monitoring, where casing acceleration measurements are essential. In contrast, the 330425 model provides a higher amplitude range of 75 g peak and a sensitivity of 25 mV/g, making it ideal for applications requiring more extensive measurement ranges.

Specifications

Electrical

• Sensitivity: 2.5 mV/m/s² (25 mV/g) ±5%
• Acceleration Range: 735 m/s² (75 g) peak overall acceleration within the 10 Hz to 15 kHz frequency span. Frequencies above 15 kHz, especially near the transducer’s resonance, significantly reduce this range.
• Amplitude Linearity: ±1% to 735 m/s² (75 g) peak
• Broadband Noise Floor (10 Hz to 15 kHz): 0.098 m/s² (0.01 g) RMS

Both Units

• Frequency Response:
  • 10 Hz to 15 kHz (600 cpm to 900,000 cpm) ±3dB
  • 30 Hz to 10 kHz (1800 cpm to 600,000 cpm) ±10%
• Temperature Sensitivity:
  • -11% to +3% typical across the operating temperature range.
• Transverse Sensitivity: Less than 5% of axial sensitivity.
• Mounted Resonant Frequency: Greater than 30 kHz
• Amplitude of Resonant Peak: 20 dB maximum
• Base Strain Sensitivity:
  • For serial numbers with the letter “G” (including all new sensors): 49 mm/s²/mstrain (0.005 g/mstrain)
  • For serial numbers without the letter “G” (shipped before April 2004):
    • 980 mm/s²/mstrain (0.100 g/mstrain) without Mounting Base (API adapter)
    • 4.9 mm/s²/mstrain (0.0005 g/mstrain) with Mounting Base (API adapter)

  For units without the letter “G,” Bently Nevada recommends using the Mounting Base to minimize base strain sensitivity.

• Maximum Cable Length: 305 meters (1000 feet) with no degradation of signal

Power Requirements

• Input Voltage: -24 ± 0.5 VDC
• Bias Current: 2 mA nominal
• Output Bias Voltage: -8.5 ± 0.5 VDC
• Grounding: Case isolated

Environmental Limits

• Operating and Storage Temperature: -55°C to +121°C (-67°F to +250°F)
• Shock Survivability: 49,050 m/s² (5000 g) peak, maximum
• Relative Humidity: 100% condensing, non-submerged. The case is hermetically sealed.
• Magnetic Field Susceptibility: <2.21 mm/s²/gauss (225 mg/gauss) [50 gauss, 50-60Hz]
• IP Rating: Equivalent to IP68 (Dust tight and watertight). This rating applies only to the sensor, not the cable.

Physical

• Weight (No Cable): 99 g (3.5 oz) typical
• Diameter: 23 mm (0.93 in)
• Height: 59 mm (2.3 in), including mounting stud
• Connector: 3-pin MIL-C-5015 Receptacle, 316L stainless steel
• Mounting Surface: 32 microinch RMS
• Mounting Torque: 4.1 N·m (3.0 ft·lb)
• Case Material: 316L stainless steel
• Weight (No Cable): 100 g (3.5 oz) typical
• Mounting Angle: Any orientation

Ordering Information 330425 Accelerometer

 

• A: Mounting Thread Option
  • 01: ¼-28 UNF integral stud
• B: Agency Approval Option
  • 5: Multiple approvals (CSA, ATEX, IECEx)

 

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