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EMERSON PR9268/303-000 – Industrial Velocity Vibration Sensor for Rotating Machinery Health
The EMERSON PR9268/303-000 is a robust velocity vibration sensor designed for continuous monitoring of motors, pumps, fans, gearboxes, and compressors. It typically delivers a stable velocity output (RMS) over the machine’s core fault band, making condition trends more reliable in everyday plant environments. From my experience, this series pairs well with most online protection systems and route-based data collectors that accept IEPE/ICP-style velocity input.
Key Features
- Velocity (RMS) output – Suits ISO 10816/20816 vibration severity assessments without post-processing.
- IEPE/ICP-style powered – In many cases operates from a constant-current source (~2–5 mA at 18–28 VDC), simplifying wiring to common monitors.
- Industrial housing – Stainless-steel, hermetically sealed design (typically IP65–IP67) for harsh areas, including splash zones.
- Broad frequency band – Tuned for mechanical faults like imbalance, misalignment, looseness, and bearing wear in the 10–1,000 Hz region (typical).
- Stud or magnet mounting – Fixed stud improves repeatability; quick-release magnet helps with spot checks and maintenance routes.
- Shielded cabling options – Reduces electrical noise pickup along long cable runs in larger plants.
- Wide ecosystem compatibility – Works with many Emerson and third-party vibration monitors, PLC/SCADA via analog signal conditioning, and data collectors.
Technical Specifications
| Brand / Model | EMERSON PR9268/303-000 |
| Measurement Type | Vibration velocity (RMS), seismic sensor |
| Power Requirements | Typically IEPE constant current 2–5 mA, 18–28 VDC compliance (sensor powered from monitor) |
| Frequency Response | Approx. 10 Hz to 1,000 Hz (±10%), application-dependent |
| Sensitivity | Typically 100 mV/in/s (≈3.94 mV/mm/s) velocity output |
| Signal I/O Type | Analog IEPE velocity output, single-ended, shielded cable |
| Connector / Cable | Commonly MIL-style 2-pin or M12 variants; armored cable options available |
| Installation Method | Stud mount (e.g., 1/4-28 UNF or M8), or magnetic base for temporary measurements |
| Operating Temperature | Typically −25 °C to +85 °C (ambient), depending on variant and cable |
| Enclosure / Rating | Stainless steel; typically IP65–IP67 |
| Dimensions & Weight | Compact industrial form factor; weight in the ~100–200 g range (typical) |
| Communication Interfaces | N/A (analog transducer) |
EMERSON PR9268/303-000
Application Fields
You’ll typically see the PR9268/303-000 used on:
- Pumps, blowers, ID/FD fans, cooling tower drives, and HVAC chillers
- Gearboxes and belt-driven assemblies on production lines
- Compressors and small steam or gas auxiliaries
- Paper machines, steel process lines, and large conveyors
- General rotating assets where velocity-based alarms conform to ISO 20816
A maintenance lead at a food plant told us their team swapped older mixed-brand pickups with PR9268 units and saw cleaner trending—noise floor dropped noticeably, which made early imbalance detection less ambiguous.
Advantages & Value
- Reliable trending – Stable sensitivity helps reduce nuisance alarms and makes long-term baselining easier.
- Compatibility – Works with many monitoring racks, condition modules on PLCs, and handheld analyzers that support IEPE velocity.
- Cost-efficient retrofit – Reusing existing cabling and stud locations is possible in many cases, which keeps installation time down.
- Strong mechanical build – Rugged stainless-steel body stands up to washdowns and temperature swings.
- Support ecosystem – Accessory options like junction boxes, armored leads, and magnetic mounts simplify day-to-day work.
EMERSON PR9268/303-000
Installation & Maintenance
- Mounting surface – Machine a flat, clean pad; use a stud (e.g., 1/4-28 or M8). Target torque is often 2–3 N·m; avoid over-torque on aluminum housings.
- Cable routing – Use shielded cable, bond shield at the monitor end, separate from power cables, and keep clear of VFD output leads.
- Environment – Provide drip loops, strain relief, and gaskets/boots where washdown or oil mist is present. Choose high-temp cables if near hot casings.
- Verification – After install, perform a bump test or reference measurement to confirm sensitivity and polarity.
- Maintenance – Re-check mounting torque during outages; clean connectors; schedule calibration every 1–2 years (portable shaker works well).
- Safety – De-energize nearby equipment before routing cables; follow site lockout/tagout and confined-space rules where applicable.
Quality & Certifications
- CE compliant; RoHS alignment typical for this sensor family
- Ingress protection typically IP65–IP67 (variant-dependent)
- ATEX/IECEx options are available on related PR9268 variants for hazardous areas—please verify the “/303-000” option set if your site requires Ex approval
- Manufacturer warranty commonly 12 months from shipment (extendable service agreements available in many regions)
EMERSON PR9268/303-000
Recommended Accessories & Supporting Components
- Stud mounting kits (1/4-28 UNF and M8), stainless-steel
- Magnetic bases for temporary measurements
- Shielded/armored sensor cables with MIL 2-pin or M12 connectors
- Junction boxes and gland fittings for on-skid terminations
- Portable shaker for periodic calibration checks
If your application needs confirmation of exact sensitivity or connector type for PR9268/303-000, share your monitor model and we’ll match the sensor and cable set accordingly. One thing I appreciate is how forgiving this series is during retrofits—most teams are up and trending within a single maintenance window.
