Epro PR9268/302-100 Velocity Vibration Sensor

Product Overview

The PR9268/302-100 is an electrodynamic vibration velocity sensor developed by Emerson EPRO for condition monitoring of rotating and reciprocating machinery. It is designed to measure casing and structural vibration directly in velocity form, providing stable signals for machinery protection and predictive diagnostics.

This sensor is typically installed on machine housings where absolute vibration velocity is required for assessing mechanical condition in turbines, compressors, pumps, and other heavy-duty rotating equipment.

Technical Specifications

Model: PR9268/302-100
Manufacturer: Emerson / EPRO
Sensor Type: Seismic Velocity Transducer (Electrodynamic)
Country of Origin: Germany

Measurement Performance

• Measurement Principle: Electrodynamic induction velocity sensing

• Output Quantity: Vibration velocity (RMS)

• Sensitivity: approximately 50 mV/mm/s (nominal, model dependent calibration)

• Frequency Response: ~10 Hz to 1,000 Hz (optimized for machinery vibration range)

• Measurement Axis: Single-axis (aligned with sensor mounting direction)

Electrical Characteristics

• Output Type: Analog voltage proportional to vibration velocity

• Power Requirement: Self-generating (no external excitation required)

• Connector Type: Cable output or 2-pin industrial connector (variant dependent)

• Signal Behavior: Passive sensor output with direct velocity proportionality

Mechanical & Environmental

• Housing Material: Stainless steel construction

• Operating Temperature Range: −30 °C to +90 °C

• Protection Rating: IP65 (dust-tight and water jet resistant)

• Shock Resistance: up to 100 g mechanical shock tolerance

• Mounting Method: Threaded or magnetic base installation depending on configuration

Functional Characteristics

• Direct measurement of absolute vibration velocity from machine casing

• No external power supply required due to electrodynamic operating principle

• Stable signal output for long-term machinery condition tracking

• Optimized frequency band for rotating machinery diagnostics rather than structural broadband analysis

• Designed for integration with vibration monitoring and protection systems

Application Areas

• Steam and gas turbine casing vibration monitoring

• Compressor housing vibration analysis

• Pump and gearbox condition assessment

• Industrial fan and blower vibration diagnostics

• Structural vibration monitoring in heavy machinery systems

Engineering Considerations

• Sensor must be rigidly mounted to ensure accurate velocity coupling

• Not suitable for displacement or acceleration measurement applications

• Best performance achieved within defined frequency band (10–1000 Hz)

• Output amplitude depends on mounting quality and mechanical contact integrity

• Suitable for long-term fixed installation in industrial environments

FAQ

Q1: Does the PR9268/302-100 require external power?
No. It operates as a passive electrodynamic sensor and generates its own output signal.

Q2: Can it measure displacement or acceleration?
No. It is specifically designed for vibration velocity measurement only.

Q3: Is it suitable for continuous machinery protection systems?
Yes, it is commonly used in continuous condition monitoring and protection architectures.