Bently Nevada 21500-04-32-05-02 Velomitor Piezo-Velocity Sensor

Maintenance Specialist Overview

The Bently Nevada 21500-04-32-05-02 Velomitor Piezo-Velocity Sensor is an industrial-grade velocity transducer designed for accurate measurement of casing vibration in rotating equipment. Built on Bently Nevada’s piezoelectric sensing technology, it produces a voltage output directly proportional to vibration velocity, providing a stable and reliable signal for condition monitoring systems.

From a maintenance standpoint, the 21500-04-32-05-02 stands out for its rugged construction, resistance to contamination, and long-term calibration stability. It offers dependable performance in environments exposed to oil mist, mechanical shock, or high temperatures — all typical of turbine and compressor installations.

Technical Specifications

Applications / Field Deployment Examples

• Casing Vibration Measurement on compressors, pumps, turbines, and fans.

• Integration with Bently Nevada 3500/42M and 1900/65A monitoring modules.

• Used in predictive maintenance programs for rotating machinery.

• Ideal for retrofit projects replacing older velocity transducers.

• Suited for hazardous or outdoor environments due to sealed housing design.

Advantages / Key Features

• Hermetically Sealed Housing: Protects against oil, dust, and humidity.

• Excellent Frequency Response: Accurate velocity readings across wide dynamic range.

• Maintenance-Free Operation: No moving parts; calibration remains stable over years.

• High Shock Resistance: Can withstand installation on heavy industrial machinery.

• Flexible Integration: Compatible with Bently Nevada and third-party monitoring systems.

• Temperature Resilience: Operates reliably across extreme thermal conditions.

Technical FAQs

1. What type of measurement does the Velomitor provide?
   – Vibration velocity (mm/s or in/s RMS).

2. What is the standard sensitivity?
   – 100 mV/in/s ±5%.

3. Can it be directly connected to a 3500 rack?
   – Yes, through 3500/42M vibration input modules.

4. What is the usable frequency range?
   – 4.5 Hz to 5 kHz.

5. How is it powered?
   – +23 to +36 V DC.

6. Is the sensor sealed?
   – Yes, hermetically sealed for harsh environments.

7. What is the mounting method?
   – Stud mount, typically 1/4-28 UNF thread.

8. What materials are compatible with the housing?
   – Stainless steel construction for corrosion resistance.

9. What temperature range can it handle?
   – –54 °C to +121 °C.

10. Does it require recalibration?
    – Normally no; periodic verification recommended every 2–3 years.

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