R9268/301-000 EPRO Electrodynamic Velocity Sensor

Product Overview

The EPRO R9268/301-000 operates as a self-generating electrodynamic velocity sensor within the MMS 6000 machinery protection framework. This heavy-duty instrument measures absolute casing vibration by leveraging a seismic mass and coil moving through a permanent magnetic field. Plant engineers hard-mount the R9268/301-000 horizontally onto the bearing housings of critical steam turbines, gas compressors, heavy industrial pumps, and high-load gearboxes to supply core tracking analytics for API 670 safety interlocks.

Technical Specifications

The sensor features a robust industrial housing optimized for specific horizontal mechanical alignment on machine surfaces.

Engineering Advantages

• Self-Generating Signal Engine Requires No External Power: The internal coil-and-magnet assembly generates its own voltage signal directly from mechanical motion. This design simplifies field deployment by eliminating the need for external power supplies or charge amplifiers over long field cable runs.

• API 670 Compliant Low-Frequency Response: A finely tuned 14 Hz natural frequency combined with a stable 0.6 damping factor ensures flat, linear data collection across the vital 10 to 1000 Hz industrial vibration spectrum, matching all criteria for standardized machinery safety systems.

• High Thermal Tolerances for Direct Turbine Mounting: The rugged internal components withstand sustained operating temperatures ranging from -30 up to +200 degrees Celsius. This permits direct attachment to hot steam turbine cases and high-pressure compressor hoods without risk of sensitivity degradation or coil insulation melting.

• Strict Structural Linearity and Cross-Axis Rejection: The internal mechanical guides limit cross-axis transverse sensitivity to less than 0.1 at 80 Hz. This guarantees that the probe isolates and reports true horizontal forces while rejecting secondary perpendicular shaft rumble or cross-coupled structural noise.

FAQs

• What is the specific mechanical difference between the R9268/301-000 and other variants in the R9268 line?

  The R9268/301-000 features internal suspension springs and mass guides calibrated exclusively for horizontal orientation. You must mount this specific model within its designated horizontal plane. Installing it vertically will misalign the internal coil within the magnetic gap, causing measurement errors and accelerating mechanical wear.

• Can this module connect directly into competitive machinery protection racks?

  Yes. Because the R9268/301-000 outputs a standardized, self-generated raw AC voltage signal rated at 17.5 mV/mm/s, it interfaces cleanly with EPRO MMS 6000 racks as well as any alternative industrial monitoring system or PLC analog input card that accepts standard velocity transducer signals.

• How do you secure this sensor onto the machine casing to avoid signal attenuation?

  You must secure the sensor using a rigid, high-mass mounting bracket or bolt it directly to a flat, machined surface on the bearing housing. Any mechanical compliance, loose fitting, or structural resonance inside the intermediate bracket will damp or distort high-frequency signals, generating inaccurate vibration velocity data.