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Product Introduction
The Epro PR9268/303-000 is an industrial-grade electrodynamic velocity sensor developed for accurate and reliable measurement of mechanical vibration in rotating machinery. Designed and manufactured by Epro, a trusted Emerson brand, the PR9268/303-000 is part of the proven PR9268 series, widely used in machinery protection and condition monitoring systems.
The sensor converts mechanical vibrations into electrical signals using a robust coil-magnet assembly. This passive operating principle ensures no external power supply is required, making it especially well-suited for rugged industrial environments with harsh conditions such as high temperatures, vibrations, and contamination.
Engineered for horizontal mounting, the PR9268/303-000 is optimized for long-term reliability and ease of integration into existing plant monitoring infrastructure.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | PR9268/303-000 |
| Sensor Type | Electrodynamic velocity sensor |
| Operating Principle | Coil and magnet system (self-generating) |
| Output Signal | Analog voltage (AC), proportional to vibration velocity |
| Sensitivity | 28.5 mV/mm/s ±5% |
| Frequency Range | 10 Hz – 1,000 Hz (-3 dB) |
| Measuring Range | 0 – 50 mm/s RMS |
| Natural Frequency | ~10 Hz |
| Mounting Orientation | Horizontal |
| Mounting Thread | M8 x 1.25 or M10 x 1.5 |
| Housing Material | Stainless steel (corrosion-resistant) |
| Connector Type | MIL-C-5015 2-pin connector or integral cable |
| Shock Resistance | Up to 500 g |
| Ingress Protection | IP65 / IP67 (depending on variant) |
| Operating Temperature | -30°C to +120°C |
| Storage Temperature | -40°C to +130°C |
| Weight | 0.93 kg |
| Dimensions | 78 × 58 mm |
| Certifications | CE, RoHS; optional ATEX-certified versions for hazardous areas |
Applications
The PR9268/303-000 is designed for a wide range of vibration monitoring applications, especially in critical rotating equipment where early fault detection can prevent costly breakdowns:
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Steam and Gas Turbines
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Centrifugal and Reciprocating Compressors
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Industrial Fans and Blowers
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Pumps and Motors in Oil & Gas Facilities
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Gearboxes in Manufacturing Lines
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Paper Machines and Calendar Rolls
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Steel Mill Equipment
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Mining and Cement Plant Machinery
It is commonly used in both portable diagnostic systems and permanently installed online monitoring systems, integrated with vibration monitors, DCS, and condition-based maintenance platforms.
Product Advantages
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Passive Design – No Power Required:
Generates its signal through internal motion, eliminating the need for external power and simplifying integration. -
High Mechanical Robustness:
Stainless steel construction and IP-rated sealing ensure resistance to industrial contaminants, temperature changes, and mechanical shocks. -
Excellent Signal Consistency:
Delivers stable and accurate readings over years of continuous use, even in vibrating environments. -
Industry-Standard Sensitivity:
With 28.5 mV/mm/s output, it is fully compatible with most vibration monitors and analyzers. -
Flexible Mounting:
Supports various thread sizes and accessories such as magnetic bases for temporary or permanent mounting. -
Low Cost of Ownership:
Durable design minimizes replacement cycles, while passive operation reduces energy and maintenance costs. -
Global Compliance:
CE and RoHS certified; optional ATEX certification makes it suitable for hazardous area use in petrochemical plants and refineries.
Frequently Asked Questions (FAQ)
-
What is the function of the PR9268/303-000 sensor?
It measures the vibration velocity of rotating machinery to detect mechanical faults. -
Is the PR9268/303-000 suitable for permanent installation?
Yes, it is designed for long-term operation in both permanent and temporary installations. -
Does the sensor require an external power supply?
No, it is a self-generating sensor and does not require external power. -
Can this sensor be used in hazardous zones?
Yes, ATEX-certified variants are available for use in hazardous areas. -
What monitoring equipment is compatible with this sensor?
Any monitoring device that accepts AC voltage input for vibration velocity is compatible. -
Is the sensor weatherproof?
Yes, its IP65/IP67 rating ensures protection against dust and water ingress. -
Can it be used in vertical mounting?
No, this specific model is optimized for horizontal mounting. Use a vertical model for vertical surfaces. -
What is the lifespan of the sensor under normal conditions?
Typically over 10 years in standard industrial environments. -
How is it connected to a monitoring system?
Via a MIL-style connector or a permanently attached cable, depending on the variant. -
Is it compatible with Emerson or other third-party monitoring systems?
Yes, it is fully compatible with Emerson systems and most third-party monitoring solutions.
Recommended Related Models (Same Series / Function)
| Model Number | Description | Mounting |
|---|---|---|
| PR9268/302-100 | Standard horizontal electrodynamic sensor | Horizontal |
| PR9268/203-100 | Vertical-mount sensor | Vertical |
| PR9268/304-000 | Explosion-proof housing version | Horizontal/Vertical |
| PR9268/205-100 | Compact size for limited spaces | Horizontal |
| PR9268/211-100 | Reinforced sensor for high shock environments | Horizontal |
| PR9268/206-100 | Wide-frequency response sensor | Horizontal |
Popular Epro Models (Same Brand – Emerson)
| Model Number | Description | Function |
|---|---|---|
| PR6423/002-030 | Eddy current proximity probe | Shaft displacement |
| PR6424/010-140 | High-temperature eddy current sensor | Turbine monitoring |
| CON011 | Signal converter for eddy current sensors | Signal conditioning |
| MMS3120/022-100 | Dual-channel vibration monitor | Machinery protection |
| MMS6120 | Compact monitor for rotating equipment | Online monitoring |
| TQ402 | Keyphasor module for speed/phase measurement | Rotational speed sensing |
