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Bently Nevada 21502-04 Velomitor Piezo-Velocity Sensor
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Technical Overview
The Bently Nevada 21502-04 Velomitor Piezo-Velocity Sensor is a self-generating, industrial-grade vibration sensor that produces a voltage signal proportional to vibration velocity. Designed for long-term monitoring of casing or housing vibration, it is a key component in machinery protection systems used in power generation, oil & gas, and petrochemical industries.
This model combines the ruggedness of a piezoelectric velocity transducer with the precision required for predictive maintenance. Its stainless-steel enclosure, wide operating temperature range, and factory calibration ensure dependable performance even in harsh field conditions.
Technical Specifications
| Parameter | Description |
|---|---|
| Model Number | 21502-04 |
| Module Type | Velomitor Piezo-Velocity Sensor |
| Measurement Type | Vibration Velocity (mm/s or in/s) |
| Sensitivity | 100 mV/in/s ±5% (nominal) |
| Frequency Range | 4.5 Hz to 5 kHz |
| Power Supply | +23 to +36 V DC (constant current source) |
| Output Signal | Single-ended voltage |
| Mounting Type | Stud mount (1/4-28 UNF thread) |
| Housing Material | Stainless steel |
| Connector Type | 2-pin MIL-C-5015 compatible |
| Temperature Range | –54 °C to +121 °C |
| Shock Limit | 5000 g peak |
| Sealing | Hermetically sealed (IP65 equivalent) |
| Typical Dimensions | 90 mm × 35 mm × 120 mm |
| Weight | 0.30 kg |
Applications / Use Scenarios
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Turbomachinery casing vibration monitoring (compressors, turbines, pumps).
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Integration with Bently Nevada 3500/42M or 1900/65A vibration monitoring modules.
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Condition-based maintenance programs in refineries and power plants.
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Retrofit applications replacing older velocity transducers.
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Monitoring machine foundation vibration in high-power rotating equipment.
Advantages / Key Engineering Features
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High Reliability: Proven piezoelectric design ensures long operational life.
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Excellent Frequency Response: Captures both low- and high-frequency vibrations accurately.
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Hermetically Sealed Construction: Prevents ingress of oil, moisture, and dust.
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No Moving Parts: Ensures long-term calibration stability with minimal maintenance.
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Shock & Temperature Resistant: Performs consistently in demanding environments.
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Plug-and-Play Integration: Fully compatible with Bently Nevada monitoring systems.
Technical FAQs
-
What is the measurement output type?
– Voltage output proportional to vibration velocity. -
Does it require external signal conditioning?
– No, it outputs directly to vibration monitors. -
What sensitivity does it offer?
– 100 mV/in/s ±5%. -
Is it compatible with 3500 systems?
– Yes, compatible with 3500/42M and 3500/93 modules. -
Can it be used in outdoor or oily environments?
– Yes, due to its hermetically sealed stainless-steel housing. -
What frequency range is typical?
– 4.5 Hz – 5 kHz. -
What mounting is recommended?
– Stud mounting using 1/4-28 UNF thread. -
How often should calibration be checked?
– Every 2–3 years under normal conditions. -
What is the operating voltage range?
– +23 V DC to +36 V DC. -
Can it withstand mechanical shock?
– Yes, up to 5000 g peak.
Recommended Related Models
| Model Number | Description |
|---|---|
| 21500-04-32-05-02 | Standard Velomitor Piezo-Velocity Sensor |
| 330400 | Casing-mounted accelerometer (velocity equivalent) |
| 3500/42M | Vibration & Position Monitor Module |
| 1900/65A | Compact vibration monitoring module |
Popular Bently Nevada Models
| Model Number | Description |
|---|---|
| 3500/15 | Power Supply Module |
| 3500/22M | Transient Data Interface Module |
| 330180-50-00 | 8 mm Proximitor Module |
| 330103-00-04-10-02-05 | 5 mm Proximity Probe |
| 2100-28-05-00-40-03-02 | Compact Proximitor Module |
| Company Information | ||||||||
| [email protected] | ||||||||
| Mobile | +8613666033393 | |||||||
| +8613666033393 | ||||||||
| 13666033393 | ||||||||
| Add | Room 1004, No. 62 Xiangxiu Li, Siming District, Xiamen City, Fujian Province, China | |||||||
Excellent PLC Co., Ltd. has a large number of brand new and original PLC and DCS spare parts, with more than 60 cooperative countries. All products are guaranteed for 1 year and delivered to you by high-quality express. We are committed to using the best products and the most favorable prices to meet the needs and friendship of our customers. We have won the trust of thousands of customers, including these excellent customers.
As for the delivery time, when we receive your order requirements, we will arrange for warehouse personnel to test and verify the products. After you place the order, we will send it to you within 24 hours.
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