Overview

Bently Nevada Velomitor Piezo-Velocity Sensors are designed to measure the absolute (relative to free space) vibration of bearing housings, casings, or structures. The 330500 Velomitor is a specialized piezoelectric accelerometer that integrates embedded electronics into a solid-state design. The 330525 Velomitor XA is a more robust version of the 330500, featuring a 316L stainless steel case, a weatherproof connector, and a cable assembly that allows for direct mounting without requiring an additional housing.

Specifications

Electrical

• 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, over temperature referenced to Pin A
• 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) of cable (part number 02173006) with no degradation of signal

Environmental Limits

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

Physical

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