Product Overview

The Emerson EPRO PR9268/617-100 operates as a high-precision electrodynamic velocity sensor (EDS) designed for absolute case vibration measurement. Unlike proximity probes that monitor relative shaft movement, this sensor installs directly onto machine housings, bearing pedestals, or structural frames to detect total vibration energy. It converts mechanical motion into a proportional electrical voltage signal without requiring an external power supply. We provide this unit as 100% Brand New and Factory Sealed, ensuring peak reliability for predictive maintenance in power plants, refineries, and offshore platforms.

Technical Specifications

The PR9268/617-100 utilizes a ruggedized internal suspension system to provide accurate data across a broad frequency spectrum.

Engineering Advantages

• Passive Signal Generation: The electrodynamic design requires no external excitation voltage. This characteristic eliminates the risk of power supply noise contaminating the vibration signal and simplifies wiring in remote or hazardous areas.

• Low-Frequency Accuracy: With a low natural frequency (~4.5 Hz), the PR9268/617-100 effectively captures low-speed vibrations that standard accelerometers often miss. This makes it an ideal choice for monitoring large industrial fans, hydro turbines, and cooling tower gearboxes.

• High Signal-to-Noise Ratio: The sensor outputs a relatively high voltage signal (20mV/mm/s). This strength allows for long-distance cable runs—up to 100 meters—without the need for intermediate amplifiers or signal boosters.

• Industrial Durability: The heavy-duty stainless steel housing resists high-pressure washdowns, corrosive atmospheres, and heavy dust. Its rugged internal construction withstands the constant mechanical shock typical of heavy rotating machinery environments.

FAQs

• Does the PR9268/617-100 measure shaft displacement or case vibration?

  The PR9268/617-100 measures absolute case vibration (velocity). It tracks how the actual machine housing moves in space. To monitor how a shaft moves inside a bearing, you must pair this with an eddy current proximity probe for a comprehensive machinery protection profile.

• Is there a specific mounting orientation required?

  Yes. Electrodynamic sensors contain internal moving masses suspended by springs. You must specify the mounting angle (horizontal, vertical, or specific degrees) during installation to ensure the internal coil remains centered. Operating the sensor at an incorrect angle will lead to signal distortion or internal mechanical damage.

• Can I connect this sensor directly to a PLC?

  While you can wire the millivolt output to a high-speed analog input card, we recommend routing the signal through an Emerson MMS6000 or AMS6500 monitoring system. These systems provide the specialized filtering and integration logic (converting velocity to displacement) necessary for API 670 machinery protection standards.

• How does this differ from a standard accelerometer?

  Standard accelerometers require power (IEPE/ICP) and are best at high frequencies. The PR9268/617-100 is passive and excels at measuring the mid-to-low frequency range (10-1000 Hz) where most mechanical faults, such as unbalance or misalignment, occur.