Emerson EPRO PR9266-12 Variable Differential Transformer Sensor

Product Overview

The PR9266-12 is a high-precision electrodynamic vibration velocity sensor engineered for the seismic measurement of absolute machine vibration. Designed by Emerson Epro for critical turbomachinery, it excels in monitoring low-to-medium frequency oscillations on bearing housings and machine casings. Its robust, self-generating construction requires no external power for signal generation, providing a reliable 4-20 mA proportional output for direct integration into DCS and PLC safety systems.

Technical Specifications

• Manufacturer: Emerson Epro

• Model Identification: PR9266-12

• Measurement Type: Absolute Vibration Velocity (Seismic)

• Standard Measuring Range: 0.5 to 100 mm/s (Velocity)

• Output Signal Configuration: 4-20 mA (Current Loop)

• Linearity Accuracy: $\pm 0.1\%$ of full scale

• Repeatability Deviation: $\pm 0.05\%$

• Nominal Power Supply: 24V DC (For transmitter electronics)

• Operational Frequency Range: 10 Hz to 1,000 Hz (Typical for PR9266 series)

• Operating Temperature: -40°C to +85°C (-40°F to 185°F)

• Housing Material: Corrosion-resistant stainless steel

• Ingress Protection: IP65 (Standard) / IP67 (Optional)

Core Engineering Advantages

• Electrodynamic Sensing Principle: Utilizes a high-sensitivity coil and permanent magnet assembly to capture mechanical energy, ensuring superior stability in low-frequency ranges where piezoelectric sensors may struggle.

• Direct System Interfacing: The integrated transmitter converts raw seismic signals into a linearized 4-20 mA output, eliminating the need for external charge amplifiers or complex signal conditioners.

• Industrial Hardening: Engineered specifically for the high-vibration environments of steam turbines, gas compressors, and hydro-power generators, with high resistance to electromagnetic interference (EMI).

• Simplified Installation: The compact, threaded mounting design allows for rapid deployment on bearing pedestals and gearboxes, facilitating seamless retrofits in aging plants.