(Note: Specific parameters can have slight variations based on manufacturing revisions or sub-options. Always refer to the official Bently Nevada 330500 Velomitor Piezo-velocity Sensor datasheet for the exact configuration you are using.)
Sensitivity: 3.94 mV/mm/s (100 mV/in/s) ±5%
Frequency Response:
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
Maximum Cable Length: 305 meters (1,000 feet) of Bently Nevada specified cable (e.g., P/N 02173006), with no degradation of signal.
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.
Case Material: 316L stainless steel
Connector: 2-pin Mil-C-5015 hermetically-sealed, 316L stainless steel shell
Weight: 142 grams (5.0 oz), typical
Diameter: 25.3 mm (0.995 in)
Height: 63.2 mm (2.49 in)
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.
Hazardous Area Approvals: Multiple approvals (e.g., CSA, ATEX, IECEx) depending on the specific configuration ordered.
High Reliability & Long Lifespan: Due to its solid-state design with no moving parts, it is highly durable, does not suffer from mechanical degradation and wear, leading to a longer service life and reduced maintenance.
Accuracy & Precision: Offers high sensitivity and precise velocity measurements, crucial for detecting subtle changes in machinery health.
Wide Frequency Range: Capable of measuring vibrations across a broad frequency spectrum, making it suitable for monitoring a variety of machinery, including high-speed equipment.
Robustness for Harsh Environments: The hermetically-sealed 316L stainless steel case provides excellent resistance to moisture, corrosion, and extreme temperatures, making it ideal for demanding industrial settings.
Flexible Mounting: Can be mounted in any orientation (vertically, horizontally, or angled), offering versatility in installation.
Integration with Monitoring Systems: Designed for seamless integration with Bently Nevada's comprehensive condition monitoring systems (e.g., 3500 series monitors), providing a complete solution for machinery protection and diagnostics.
Cost-Effective Monitoring: Provides reliable data for predictive maintenance strategies, helping to identify potential issues early, preventing catastrophic failures, and reducing unscheduled downtime and repair costs.
Proper Installation Location: While versatile, the effectiveness of casing vibration measurements depends on the machine's ability to transmit rotor vibration to the housing. Choose a mounting location where the sensor can best detect machine vibration. Improper installation can degrade performance or generate misleading signals.
Mounting Surface: Ensure the mounting surface is clean, flat, and rigid to ensure proper vibration transmission to the sensor. Use the specified mounting torque.
Cable Length and Type: Use only Bently Nevada specified cables (e.g., P/N 02173006) for signal integrity. Adhere to the maximum cable length of 305 meters (1,000 feet) to avoid signal degradation. Longer lengths may require special consideration or contact with Bently Nevada technical support.
Cable Routing: Route cables away from sources of electrical noise (e.g., power cables, VFDs) to prevent interference.
Grounding and Shielding: Proper grounding and shielding are critical for accurate data and to minimize electrical noise. Refer to the installation manual for detailed grounding instructions.
Environmental Limits: Do not operate the sensor outside its specified operating temperature and shock survivability limits, as this can lead to false readings or loss of machine monitoring.
Integration with Monitors: The sensor's output is typically connected to compatible Bently Nevada vibration monitors or other data acquisition systems. Ensure compatibility and proper configuration of the monitoring system to interpret the sensor's signal correctly.
Avoiding Signal Integration to Displacement: Exercise extreme caution if integrating the velocity output to displacement, as electrical noise can be amplified, leading to inaccurate displacement data. For direct displacement measurements, proximity probes are generally preferred.
Hazardous Area Compliance: If used in hazardous locations, ensure the sensor's specific configuration has the necessary agency approvals (e.g., ATEX, FM, CSA) and that installation strictly adheres to the relevant hazardous area codes and standards.
The Bently Nevada 330500 Velomitor Piezo-velocity Sensor is extensively used for vibration monitoring and protection in a wide range of industrial rotating machinery, particularly for measuring casing or bearing housing vibrations.
Pumps: Monitoring vibration on centrifugal, reciprocating, and vertical pumps to detect imbalance, misalignment, looseness, or bearing wear.
Fans and Blowers: Protecting industrial fans and blowers from excessive vibration caused by imbalance, bearing faults, or aerodynamic issues.
Compressors: Monitoring casing vibration on centrifugal, axial, and reciprocating compressors.
Motors: Assessing the health of electric motors by detecting vibration related to bearings, imbalance, or coupling issues.
Turbines (Gas & Steam): Monitoring casing vibration for overall machine health, especially on less critical units or for backup protection.
Generators: Used for vibration monitoring on the generator casing.
Gearboxes: Detecting vibration associated with gear mesh problems, bearing wear, or imbalance.
Cooling Towers: Monitoring vibration of fans and gearboxes in cooling tower applications.
Pulp & Paper Industry: Monitoring various rotating equipment in paper mills.
Oil & Gas Industry: Crucial for monitoring machinery health in refineries, petrochemical plants, and offshore platforms.
