Product Overview

The Emerson PR9268/300-000 is a high-precision electrodynamic velocity sensor developed under the EPRO product line for advanced vibration monitoring of rotating machinery. Unlike standard proximity probes, the PR9268 series is specifically designed to measure absolute bearing housing vibration in accordance with international standards such as ISO 10816 and VDI 2056. By utilizing a suspended coil moving within a permanent magnetic field, the sensor generates a voltage proportional to the vibration velocity, providing a direct and reliable metric for assessing machinery mechanical health.

This sensor is a fundamental component of Emerson’s machinery protection systems, offering critical data to Distributed Control Systems (DCS) and dedicated vibration monitors. Its "active" status in the Emerson portfolio ensures it remains a current solution for detecting mechanical imbalances, misalignment, and bearing wear in high-capital assets like steam turbines, industrial compressors, and large-scale aeration fans.

Core Technical Characteristics and Engineering

The PR9268/300-000 is engineered to maintain signal linearity and structural integrity in the most demanding industrial zones.

• Broad Frequency Detection: Capable of monitoring vibration frequencies from 4 Hz to 10,000 Hz, capturing both low-speed structural oscillations and high-frequency mechanical faults.

• Electrodynamic Measuring Principle: Operates without the need for external power (self-generating), producing a low-impedance output that is highly resistant to electromagnetic interference (EMI).

• Industrial Grade Encapsulation: Housed in a hermetically sealed, IP67-rated stainless steel casing, the sensor is impervious to moisture, oil mist, and corrosive chemical exposure.

• High-Temperature Resilience: Optimized for deployment on hot machine surfaces, ensuring stable measurement performance even during continuous high-temperature operation.

• Versatile Mechanical Interface: Supports standard stud mounting for permanent installations, as well as magnetic or adhesive bases for temporary diagnostic testing.

• Linear Signal Output: Delivers a consistent sensitivity profile (typically 28.5 mV/mm/s or similar depending on calibration), allowing for immediate integration with standard vibration transmitters.

Technical Specifications

• Manufacturer: Emerson (EPRO Series)

• Model Number: PR9268/300-000

• Sensor Type: Electrodynamic Velocity Sensor

• Frequency Range: 4 Hz to 10 kHz

• Output Signal: Voltage proportional to velocity

• Protection Class: IP67 (Dust-tight and immersion resistant)

• Housing Material: Stainless Steel

• Dimensions: 25 x 22 x 8 cm

• Net Weight: 0.75 kg

• Product Origin: USA

Industrial Applications

The PR9268/300-000 is the industry standard for vibration monitoring in high-stakes environments:

• Power Generation: Absolute vibration monitoring of turbine-generator bearing pedestals.

• Refining & Petrochemical: Continuous health tracking of centrifugal compressors and heavy-duty pumps.

• Steel & Mining: Monitoring large gearboxes and conveyor drive motors subjected to heavy mechanical loads.

• Water Utilities: Early fault detection in high-capacity vertical and horizontal pumps.