Overview
Configured for absolute bearing vibration measurement in machinery protection systems, the Emerson EPRO PR9268/302-100 (PR9268 electrodynamic velocity sensor) converts casing vibration into an analog AC voltage signal through a self-powered moving-coil mechanism. The sensor requires no external excitation and provides horizontal mounting with an integrated armored cable and Harting connector.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | PR9268/302-100 |
| Brand | Emerson / EPRO |
| Product Type | Electrodynamic Velocity Sensor / Absolute Vibration Sensor |
| Weight | Approx. 0.96 kg |
| Operating Temp | -20 deg C to +100 deg C |
| Power Consumption | None; self-powered electrodynamic operation |
| Measurement Principle | Electrodynamic moving-coil principle |
| Mounting Orientation | Horizontal, +/- 10 deg deviation limit |
| Sensitivity | 28.5 mV/mm/s (723.9 mV/in/s) |
| Frequency Range | 4 to 1000 Hz |
| Natural Frequency | 4.5 Hz +/- 0.75 Hz at 20 deg C |
| Linearity | < 2% |
| Maximum Acceleration | 10 g peak-peak continuous; 20 g intermittent |
| Transverse Acceleration | <= 2 g |
| Coil Resistance | 1875 ohm +/- 10% |
| Inductance | <= 90 mH |
| Capacitance | < 1.2 nF |
| Protection Class | IP55 |
| Relative Humidity | 0 to 100%, non-condensing |
| Housing Material | Al-Mg-Si alloy |
| Cable | 8 m integrated armored PTFE cable |
| Connector | Heavy-duty Harting connector |
| Signal Type | Analog AC voltage generated by vibration |
| Installation Orientation | Horizontal |
Electrodynamic Measurement and Signal Interface
The PR9268/302-100 uses a moving coil to convert mechanical vibration into an electrical AC signal. Therefore, the sensor does not require an external power supply for signal generation.
The 28.5 mV/mm/s sensitivity defines the voltage output relative to vibration velocity. The 4 to 1000 Hz frequency range supports measurement of both low-frequency and higher-frequency casing vibration.
The 4.5 Hz natural frequency provides the mechanical reference for the sensor’s low-frequency response. Meanwhile, the specified linearity and acceleration limits define the usable measurement behavior under continuous and intermittent vibration conditions.
The integrated 8 m armored PTFE cable carries the generated signal to the monitoring circuit. The Harting connector provides the specified electrical connection between the sensor assembly and associated monitoring equipment.
Frequently Asked Questions
Q: Does the PR9268/302-100 require an external power supply?
A: No. The sensor uses an electrodynamic moving-coil principle and generates its measurement signal from mechanical vibration.
Q: What vibration quantity does the sensor measure?
A: The sensor measures absolute bearing or casing vibration in velocity form and generates an analog AC voltage proportional to vibration velocity.
Q: Can the sensor be installed vertically?
A: The supplied specification defines horizontal mounting with a +/- 10 deg deviation limit. Installation should therefore maintain this orientation range.
Field Installation Guidelines
Install the PR9268/302-100 on a mechanically rigid measurement point that represents the bearing or machine casing vibration. Maintain the specified horizontal orientation within the stated +/- 10 deg limit.
Route the integrated armored cable away from high-current power conductors, switching devices, and other sources of electromagnetic interference. Avoid sharp bends, excessive mechanical tension, and unnecessary cable movement.
Use the specified Harting connector and ensure that the mating connection remains mechanically secure during machine operation. Keep the connector and cable termination protected from contamination and mechanical damage.
The sensor housing provides IP55 protection. Therefore, installation should prevent direct exposure to conditions beyond the specified environmental protection level.
Before commissioning, verify the mechanical mounting, cable continuity, connector engagement, sensor orientation, and signal path to the associated vibration monitoring equipment. Confirm that the monitoring system uses the specified sensor sensitivity when converting the AC signal into vibration velocity.
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