Emerson PR9268/017-100 Electrodynamic Velocity Sensor

The Emerson PR9268/017-100, also cataloged as the PR9268 Electrodynamic Velocity Sensor, operates as a dedicated hardware component for absolute structural vibration measurement within Emerson machinery monitoring platforms. It generates an analog voltage output directly proportional to vibration velocity via electrodynamic seismic coil-magnet induction.

Hardware Specifications

4-20 mA HART Loop Protocol and Signal Conditioning Integration

The passive output generated by the Emerson PR9268/017-100 routes to external signal conditioning modules or DCS monitoring racks, converting raw AC velocity signals into standardized 4-20 mA HART loop protocol variables for plant-wide trending. High channel-to-channel isolation within receiving I/O cards prevents noise coupling across parallel vibration channels. The high internal coil resistance of 1723 ohm ensures voltage signal integrity over extended field wiring runs without excessive signal attenuation.

Frequently Asked Questions

Q: Does the PR9268/017-100 electrodynamic sensor require an external DC power supply to operate?

A: No, the transducer operates as a self-generating passive electrodynamic sensor, producing a proportional AC voltage output via internal coil movement inside a magnetic field.

Q: What physical measurement limit applies to the continuous vibration exposure of this sensor?

A: The sensor handles a maximum continuous vibration acceleration of 10g peak-to-peak and dynamic displacement amplitudes up to 500 um peak-to-peak across its 14 to 1000 Hz operating band.

Q: How does transverse acceleration affect measurement integrity?

A: Transverse acceleration must be kept below 2g peak-to-peak, as cross-axis motion beyond this threshold increases transverse sensitivity above the specified <0.1 ratio at 80 Hz.

Field Installation Guidelines

• Mount the stainless steel housing rigidly onto the bearing pedestal using designated threaded mounting studs, ensuring flat surface contact to preserve frequency response up to 1000 Hz.
• Maintain orientation along the designated primary measurement axis to minimize lateral mechanical stress and cross-axis error.
• Route twisted-shielded instrumentation cable from the sensor housing through grounded metallic conduit separate from AC motor power cables.
• Connect cable shielding to the system earth ground at the monitoring panel end only to prevent ground loop currents from corrupting low-level AC voltage signals.