About PR9268/017-100
PR9268/017-100 is an industrial-grade electrodynamic velocity sensor launched by Emerson EPRO, specifically designed for absolute vibration monitoring of critical rotating equipment. This product adopts a mature electrodynamic measurement principle, which can directly convert mechanical vibration into voltage signals to achieve continuous monitoring of the equipment's operating status.
Technical Information
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Manufacture |
EMERSON |
|
Model |
PR9268/017-100 |
|
Description |
Electrodynamic Velocity Sensor |
|
Origin |
Germany |
|
Dimension |
24*17*6cm |
|
Weight |
0.55kg |
| Material | Stainless steel casing |
| Protection level | IP65 |
| Operating temperature | -20°C to +100°C |
| Humidity | 0 - 100% (non-condensing) |
Core technical parameters
Sensitivity: 17.5 mV/mm/s
Frequency range: 14 – 1000 Hz
Natural frequency: 14 Hz ±7%
Vibration amplitude range: ±500 μm
Linear error: < 2%
Lateral sensitivity: < 0.1 @ 80Hz
Damping coefficient: ≈ 0.6%
Maximum continuous acceleration: 10 g
Maximum instantaneous acceleration: 20 g
Lateral acceleration: 2 g
Resistance: Approximately 1723 Ω ±2%
Inductance: ≤ 90 mH
Capacitance: < 1.2 nF
Power supply method: Self-powered (no external power supply required)
PR9268/017-100 Working Principle
PR9268/017-100 adopts the electrodynamic (Electrodynamic / Seismic) measurement principle and is essentially an "inertial type vibration sensor".
▶ Core Structure
The internal structure of the sensor mainly consists of three parts:
Inertial mass (coil assembly)
Permanent magnet (provides magnetic field)
Damping system (stabilizes response)
▶ Working process (key logic)
When the equipment is operating and generating vibrations:
The sensor housing is fixed on the surface of the device and will vibrate along with it.
The internal inertial mass (coil) does not move synchronously due to inertia.
There is relative motion between the coil and the magnetic field.
According to the principle of electromagnetic induction (Faraday's Law)
▶Output Characteristics
The output signal is directly proportional to the vibration speed of the equipment (mm/s).
The sensor directly outputs an analog voltage signal, which is a typical speed-type output.
The signal conversion is achieved using an electric principle, without the need for external power supply support.
The output response has good linear characteristics and can reflect the trend of vibration changes.
It is suitable for integration into various vibration monitoring systems and signal processing equipment.
Application and design
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Application
The electro-dynamic transducers PR 9268/01x-x00, PR 9268/20x−x00, PR 9268/30x−x00, PR 9268/60x−000, and PR 9268/70x−000 serve the measurement of absolute vibrations. They operate on the seismic measurement principle. A measuring coil, suspended on membrane springs, is the seismic mass of the transducer. By operating the transducer above the resonance frequency, the seismic mass will remain at rest. The relative motion between the transducer housing (moving with the measuring object) and the resting coil generates a voltage signal proportional to the vibration velocity.
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Design
PR 9268/01x-x00
A robust construction and a splash-proof housing made of stainless steel permit the use of the transducer in hostile environments with temperatures up to 100°C. The transducer PR 9268/01x-x00 is available with different options. See Table 1. Figure 1 shows two transducer types, one with C-5015 Plug and one with non-armored cable.
FAQ
Common Questions
1. What type of signal does PR9268/017-100 output?
The sensor outputs an analog voltage signal that is proportional to vibration velocity (mm/s). It does not require signal conversion at the sensor level, making it suitable for direct integration with vibration monitoring systems.
2. Does the sensor require an external power supply?
No. PR9268/017-100 operates on an electrodynamic principle and is self-generating. It does not require an external power source, which simplifies installation and reduces potential failure points.
3. What kind of applications is this sensor typically used for?
It is primarily used for monitoring absolute vibration of rotating equipment such as turbines, compressors, pumps, and fans. It is commonly installed on bearing housings or machine casings.
4. What is the difference between a velocity sensor and an accelerometer?
A velocity sensor like PR9268/017-100 is more suitable for mid-frequency vibration measurement and provides a direct indication of machine condition. Accelerometers are typically used for high-frequency analysis, while displacement sensors are more effective at low frequencies.