Description
Note: Many products are not yet listed. Please contact us for more product information. Our supply channels are constantly expanding, and we currently have 20 stable shared supply channels. Please confirm the model, product, price, and all other necessary information with customer service before placing an order. We offer new, refurbished, and used products, and prices are adjusted according to the year of the item you require.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Measurement Principle | Electrodynamic seismic (absolute vibration) |
| Sensitivity | 28.5 mV/mm/s (723.9 mV/in/s) @ 50 Hz, 20°C |
| Frequency Response | 4 Hz to 1000 Hz |
| Natural Frequency | 4.5 Hz ±0.75 Hz at 20°C |
| Max Vibration Amplitude | 3000 μm peak‑peak continuous; 4000 μm peak‑peak intermittent |
| Amplitude Linearity | <2% |
| Max Transverse Acceleration | 2 g |
| Coil Resistance | 1875 Ω ±10% |
| Inductance | ≤90 mH |
| Power Requirement | Self‑powered, no external supply required |
| Mounting Orientation | Designed for vertical installation; limited angular deviation allowed |
| Operating Temperature | -20 °C to +120 °C |
| Protection Class | IP65 |
| Compatible Systems | EPRO MMS3000 series monitoring modules, AMS machinery protection systems |
| Cable | 4‑wire signal connection |
| Hot Swap | Not applicable; sensor is field-mounted transducer |
Product Introduction
EPRO PR9268/303-000 is a seismic electrodynamic velocity transducer used for absolute vibration measurement on bearing housings and machine casings. Unlike eddy current probes that measure shaft relative vibration, this sensor captures the true vibration of the machine structure itself. It generates analog velocity signal passively from coil movement, so it does not need external excitation power. The signal feeds into MMS3120 or other MMS3000 rack monitors to trigger vibration alarms and trips for rotating equipment. Its rugged sealed housing withstands high temperature, oil mist and vibration in powerhouse and compressor skid environments. This model is a standard spare for legacy EPRO machinery protection installations.
PR9268303-000
PR9268303-000
PR9268303-000
Application Scenarios & Field Experience
This sensor is widely used on critical turbomachinery for safety and predictive maintenance.
- Steam turbines: Bearing housing vibration monitoring for power plant turbine protection
- Gas turbines: Case vibration measurement for combined cycle units
- Centrifugal compressors: Refinery and gas plant anti-surge and vibration protection
- Large pumps and induced draft fans: Bearing condition monitoring
- Hydro turbine units: Generator bearing vibration supervision
A refinery centrifugal compressor had unstable vibration readings. The existing PR9268 sensor had degraded internal suspension spring, causing drifting baseline. After replacement with PR9268/303-000 and tightening the base mounting bolts, vibration readings returned stable, and false high-vibration alarms stopped.
Standard Operating Procedure (SOP) for Quality Control
- Visual Inspection: Check sensor housing, cable entry, connector, and nameplate; confirm no dents, seal damage or cable insulation cracks.
- Part & Revision Check: Verify full part number PR9268/303-000 and hardware revision against MMS compatibility list.
- Coil Resistance Test: Measure coil resistance and inductance to confirm within factory tolerance band.
- Dynamic Response Test: Use vibration shaker to verify output sensitivity and frequency response at 50Hz reference.
- Insulation Check: Test insulation between signal wires and sensor housing.
- Cable Continuity Check: Confirm no open circuit or short circuit in internal wiring.
- Protective Packaging: Wrap with shock-absorbent foam, mark fragile vibration transducer, ESD precautions for signal wiring.
Frequently Asked Questions (FAQ)
Q1: What is the difference between PR9268/203 and PR9268/303? A: Both share the same core sensitivity and frequency specs. The /303 variant has higher transverse sensitivity and different mounting orientation limits; they are not always direct drop-in replacements.
Q2: Does this sensor need 24V power supply? A: No. It is self-powered electrodynamic type. It generates voltage signal from vibration motion. Do not apply external DC power to the signal wires.
Q3: Can it replace eddy current probes? A: No. Eddy probes measure shaft relative vibration; seismic sensors measure bearing housing absolute vibration. They serve different monitoring points.
Q4: What is the warranty term? A: 12 months warranty from shipment date. Warranty excludes damage from over-shock, over-temperature, broken cable, incorrect wiring or mechanical impact after installation.
Q5: What monitor module matches this sensor? A: It pairs with EPRO MMS3120 dual-channel vibration transmitters in the MMS3000 rack system.
