Overview

The 330400 Accelerometer Acceleration Transducers are designed for critical machinery applications where casing acceleration measurements are necessary, such as gear mesh monitoring. The device adheres to the American Petroleum Institute Standard 670 for accelerometers. It offers a 50 g peak amplitude range and a sensitivity of 100 mV/g. An alternative model, the 330425, provides a larger amplitude range of 75 g peak and a sensitivity of 25 mV/g.

Specifications

• Sensitivity: 10.2 mV/m/s² (100 mV/g) ±5%
• Acceleration Range: 490 m/s² (50 g) peak across 10 Hz to 15 kHz frequency span
  • Note: Vibration at frequencies above 15 kHz, especially at the transducer's resonance, may significantly decrease the range.
• Amplitude Linearity: ±1% to 490 m/s² (50 g) peak
• Broadband Noise Floor (10 Hz to 15 kHz): 0.039 m/s² (0.004 g) rms
• 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:
  • Typical variation from -11% to +3% over the operating temperature range
• Transverse Sensitivity: Less than 5% of axial
• Mounted Resonant Frequency: Greater than 30 kHz
• Amplitude of Resonant Peak: 20 dB maximum

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 Conditions

• 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, 50-60 Hz]
• IP Rating: Equivalent to IP 68 (Dust-tight and watertight). This rating applies only to the sensor and does not apply to the cable.

Physical Characteristics

• 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
• Case Material: 316L stainless steel
• Mounting Surface: 32 microinch rms
• Mounting Torque: 4.1 N·m (3.0 ft·lb)
• Mounting Angle: Any orientation

Additional Notes

• Case Material: 316L stainless steel
• Weight (No Cable): 100 g (3.5 oz) typical