Compact Electrodynamic Vibration Monitoring for Industrial Machinery
The Epro PR9268/20 Electric Speed Sensor is a compact electrodynamic velocity measurement device designed for continuous vibration monitoring in industrial machinery systems. It is widely used for measuring absolute vibration velocity in rotating equipment, helping operators evaluate machine condition and maintain stable operational performance.
Operating on a self-generating electrodynamic principle, the sensor converts mechanical vibration directly into a proportional electrical signal without requiring external excitation power. Its simple structure and reliable signal behavior make it suitable for long-term industrial condition monitoring applications.
Technical Specifications
| Specification | Details |
|---|
| Manufacturer | Epro (Emerson legacy series) |
| Model Number | PR9268/20 |
| Product Type | Electric Speed Sensor / Electrodynamic Velocity Sensor |
| Measurement Function | Absolute vibration velocity monitoring |
| Operating Principle | Electrodynamic induction system |
| Sensitivity | 28.5 mV/mm/s (±5% typical at 80 Hz, 20°C) |
| Frequency Range | 4 Hz – 1000 Hz |
| Natural Frequency | ~4.5 Hz ±0.75 Hz |
| Linearity | < 2% |
| Output Signal | Analog voltage proportional to vibration velocity |
| Measurement Range | Up to ±1500 µm (typical application range) |
| Maximum Acceleration | 10 g continuous / 20 g intermittent |
| Transverse Sensitivity | ~0.13 (typical) |
| Coil Resistance | ~1875 Ω ±10% |
| Inductance | ≤ 90 mH |
| Active Capacitance | < 1.2 nF |
| Housing Material | Aluminum alloy (industrial grade) |
| Cable Type | Industrial PTFE or armored cable |
| Connector Options | Open cable or industrial connector variants |
| Operating Temperature | -20°C to +100°C (standard) |
| Protection Class | IP55 (typical configuration) |
| Weight (Approx.) | ~0.8 kg |
| Dimensions (Approx.) | 160 × 160 × 120 mm (configuration dependent) |
Application Areas
Turbomachinery Monitoring Systems
Used for vibration velocity measurement in steam turbines, gas turbines, and hydro turbines.
Compressor Systems
Supports condition monitoring of industrial air and gas compression equipment.
Pumping and Fan Systems
Helps evaluate mechanical stability and detect operational changes in rotating equipment.
Power Generation Facilities
Applied in monitoring systems for generators and auxiliary rotating machinery.
Industrial Processing Equipment
Suitable for continuous monitoring in heavy-duty industrial environments.
Key Advantages
Stable Signal Output
Delivers consistent vibration velocity signals for reliable long-term monitoring.
Self-Powered Operation
No external excitation required, simplifying installation and system design.
Proven Industrial Reliability
Widely used in turbomachinery monitoring applications worldwide.
Easy Integration
Compatible with standard vibration monitoring and protection systems.
Durable Mechanical Design
Built for continuous operation in demanding industrial environments.
Low Maintenance Requirement
Designed for long service life with stable performance characteristics.
Technical FAQs
1. What is the main function of this sensor?
It measures absolute vibration velocity in industrial machinery.
2. What technology does it use?
It uses an electrodynamic self-generating induction principle.
3. Does it require external power?
No, it operates without external power supply.
4. What equipment is it used with?
It is used with turbines, compressors, pumps, and industrial motors.
5. What type of signal does it output?
It outputs an analog voltage proportional to vibration velocity.
6. What is the operating temperature range?
It operates between -20°C and +100°C.
7. Is it suitable for continuous operation?
Yes, it is designed for continuous industrial monitoring.
8. What industries use this model?
Power generation, oil & gas, petrochemical, and manufacturing industries.
9. Is it suitable for turbine monitoring?
Yes, it is commonly used in turbomachinery vibration systems.
10. Why is this model widely used?
Because it provides stable, maintenance-friendly vibration measurement with proven industrial reliability.
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