Bently Nevada Velomitor Piezo-Velocity Sensor (Model: 330500)

The Bently Nevada Velomitor Piezo-Velocity Sensor is designed for measuring absolute (relative to free space) bearing housing, casing, or structural vibrations. This sensor utilizes a specialized piezoelectric accelerometer with embedded integrated electronics in a solid-state design.

Specifications

Electrical Specifications

• Sensitivity:
  3.94 mV/mm/s (100 mV/in/s) ±5%
• Frequency Response:
  • 4.5 Hz to 5 kHz (270 cpm to 300 kcpm) ±3.0 dB
  • 6.0 Hz to 2.5 kHz (360 cpm to 150 kcpm) ±0.9 dB
• Temperature Sensitivity:
  -14% to +7.5% typical over the operating temperature range
• Velocity Range:
  1270 mm/s (50 in/s) peak
• Transverse Sensitivity:
  Less than 5% of sensitivity
• Amplitude Linearity:
  ±2% to 152 mm/s (6 in/s) peak
• Mounted Resonant Frequency:
  Greater than 12 kHz
• Output Bias Voltage:
  -12 ±3.0 VDC (referenced to Pin A) over temperature
• Dynamic Output Impedance:
  Less than 2400 Ω
• Broadband Noise Floor (4.5 Hz to 5 kHz):
  0.004 mm/s (160 μin/s) rms, nominal
• Grounding:
  Case isolated
• Maximum Cable Length:
  305 meters (1,000 feet) with no signal degradation using cable part number 02173006

Environmental Specifications

• Operating Temperature Range:
  -55°C to 121°C (-67°F to 250°F)
• Shock Survivability:
  5,000 g peak, maximum
• Relative Humidity:
  Up to 100%, non-submerged; case is hermetically sealed

Other Specifications

• Base Strain Sensitivity:
  0.005 in/s/mstrain
• Magnetic Field Susceptibility:
  <51 min/s/gauss (50 gauss, 50-60Hz)

Physical Specifications

• Weight:
  142 grams (5.0 oz), typical
• Diameter:
  25.3 mm (0.995 in)
• Height:
  63.2 mm (2.49 in)
• Case Material:
  316L stainless steel
• Connector:
  2-pin Mil-C-5015, hermetically sealed, 316L stainless steel shell
• Mounting Torque:
  32-46 kg cm (24-40 in-lb) max
• Polarity:
  When the sensor case motion is toward the connector, Pin A becomes positive with respect to Pin B

Output Characteristics

• Inrush Current:
  3 Amps supplied for 10 ms without ESCP trip
• Output Voltage Drop:
  0.3 V DC maximum
• Steady-state Overcurrent Trip:
  5 Amps typical per point
• Output Leakage Current:
  0.1 mA maximum
• On Response Time:
  0.5 ms maximum
• Off Response Time:
  0.5 ms maximum
• Protection:
  Short-circuit protection, overcurrent protection, overtemperature protection, all with auto recovery