Product Overview
The Bently Nevada 21502-04 Velomitor Piezo-Velocity Sensor is a solid-state vibration sensor engineered to measure absolute vibration velocity on machine housings and bearing structures. Utilizing integrated piezoelectric technology, the sensor provides stable and repeatable vibration measurements without the mechanical wear associated with traditional moving-coil velocity transducers.
Model 21502-04 is designed for continuous equipment condition monitoring and offers dependable long-term performance in a compact stainless steel package. Its robust construction, broad frequency response, and compatibility with Bently Nevada monitoring systems make it an excellent choice for critical rotating machinery across a wide range of industries.
Technical Specifications
| Specification | Details |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 21502-04 |
| Product Type | Velomitor Piezo-Velocity Sensor |
| Sensor Technology | Integrated Piezoelectric Velocity Sensor |
| Measurement Type | Absolute Vibration Velocity |
| Output Sensitivity | 3.94 mV/mm/s (100 mV/in/s) ±5% |
| Frequency Response | 4.5 Hz to 5 kHz (±3 dB) |
| Alternate Frequency Response | 6 Hz to 2.5 kHz (±0.9 dB) |
| Maximum Measurable Velocity | 1270 mm/s (50 in/s) Peak |
| Mounted Resonant Frequency | Greater than 12 kHz |
| Dynamic Output Impedance | Less than 2400 Ω |
| Maximum Cable Length | 305 m (1000 ft) |
| Housing Material | Stainless Steel |
| Electrical Connector | 2-Pin MIL-C-5015 Receptacle |
| Mounting Thread | 3/8-24 UNF |
| Operating Temperature | -55°C to +121°C (-67°F to +250°F) |
| Dimensions | Approx. Ø25.3 mm × 73 mm |
| Approximate Weight | 0.30 kg |
| Country of Origin | USA |
Typical Applications
The 21502-04 Velomitor Piezo-Velocity Sensor is suitable for continuous casing vibration measurement on a wide variety of rotating equipment.
Typical applications include:
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Steam turbines
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Gas turbines
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Centrifugal compressors
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Pumps
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Electric motors
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Gearboxes
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Fans
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Blowers
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Cooling tower drives
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General rotating machinery
Its solid-state sensing design delivers reliable vibration measurements with minimal maintenance requirements throughout its service life.
Technical FAQs
1. What does the 21502-04 sensor measure?
It measures absolute vibration velocity on machine casings and bearing housings.
2. Which sensing technology is used?
The sensor uses integrated piezoelectric velocity sensing technology with built-in electronics.
3. What is the nominal sensitivity?
The nominal sensitivity is 3.94 mV/mm/s (100 mV/in/s) ±5%.
4. What frequency range does the sensor support?
The standard operating frequency response is 4.5 Hz to 5 kHz (±3 dB).
5. What is the maximum vibration velocity range?
The sensor measures vibration velocities up to 1270 mm/s (50 in/s) peak.
6. What material is used for the housing?
The sensor housing is manufactured from stainless steel for durability and corrosion resistance.
7. What operating temperature range is supported?
The operating temperature range is -55°C to +121°C (-67°F to +250°F).
8. What are the approximate dimensions and weight?
The sensor measures approximately 25.3 mm in diameter × 73 mm in length and weighs about 0.30 kg.
9. What is the maximum recommended cable length?
The sensor supports cable lengths of up to 305 m (1000 ft) while maintaining specified performance.
10. Is the sensor suitable for continuous monitoring?
Yes. The 21502-04 is designed for permanent installation and continuous vibration monitoring of rotating equipment.
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