Overview

The Bently Nevada Velomitor Piezo-velocity Sensor 330500 is a specialized piezoelectric accelerometer designed to measure absolute vibration (relative to free space) of bearing housings, casings, or structural components. It incorporates integrated electronics in a solid-state design.

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 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 signal degradation.

Environmental Limits

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.

Base Strain Sensitivity

• 0.005 in/s/mstrain.

Magnetic Field Susceptibility

• <51 min/s/gauss (50 gauss, 50-60 Hz).

Physical

• 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.