Emerson PR9268/203-100 Vertical Velocity Sensor
A vertical electrodynamic sensor with a 10 m armored open-end cable for absolute case-vibration measurement.
Technical Summary
PR9268/203-100 is an Emerson mechanical velocity sensor for vertical mounting and absolute casing-vibration measurement. The /20 family operates over 4 to 1000 Hz and provides 28.5 mV/mm/s sensitivity.
The 3 ordering digit selects a 10 m armored cable; the 1 cable-end digit selects an open cable end. The complete suffix must be retained because cable construction and termination differ from other /20 variants.
Specifications
| Manufacturer | Emerson |
|---|---|
| Model | PR9268/203-100 |
| Measurement | Absolute case vibration velocity |
| Orientation | Vertical; ±30° without sinking current, ±60° with sinking current |
| 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°C |
| Operating Temperature | -20 to +100°C (-4 to +212°F) |
| Cable | 10 m, armored |
| Cable End | Open cable end |
| Protection | IP55 |
| Housing Material | Al Mg Si Pb F 28 |
| Power | Self-powered |
| Maximum Acceleration | 10 g peak-to-peak continuous; 20 g intermittent |
Features
- Provides low-frequency case-vibration measurement down to 4 Hz.
- Uses a ten-meter stainless-steel-armored cable for protected routing.
- Offers an open cable end for direct termination in the approved junction or monitor circuit.
- Supports vertical machinery locations within the specified inclination envelope.
Compatibility
- Match monitor input sensitivity and engineering-unit scaling to 28.5 mV/mm/s.
- Confirm vertical orientation, mounting surface and available armored-cable bend radius.
- Verify terminal assignment, shield treatment, barrier data and hazardous-area approvals.
- Do not substitute PR9268/207-100, whose ten-meter cable is non-armored.
Replacement
- Record polarity, terminal numbers, shield bonding and channel settings before disconnection.
- Support the armored cable so its mass does not preload the sensor.
- Verify noise floor, polarity, scaling and alarm operation after installation.
FAQ
PR9268/203-100: What termination evidence should be supplied?
Provide terminal-strip photographs, conductor colors, shield connection, barrier or isolator model and the monitor input-card designation.
PR9268/203-100: How is it distinguished from PR9268/207-100?
Both have a ten-meter open-end lead, but PR9268/203-100 uses armored cable while PR9268/207-100 uses non-armored cable.
PR9268/203-100: What routing check is important for the armored lead?
Confirm minimum bend radius, mechanical support, hot-surface clearance and that cable weight cannot twist or bias the sensor.
PR9268/203-100: Can the existing channel scaling be reused automatically?
Only if the previous sensor sensitivity, polarity and monitor input configuration are documented as the same.
PR9268/203-100: What information reduces commissioning time?
Retain the previous baseline spectrum, overall velocity, polarity, alarm setpoints and a marked terminal drawing.
PR9268/203-100: What should a hazardous-area quotation state?
It should identify the exact approval option, compatible interface equipment, cable termination scope and required certificates rather than relying on the family name alone.
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