Overview
PR6426/000-030 is a 32mm diameter, high-range non-contact eddy current sensor produced by German EPRO (now part of Emerson). It is specifically designed for large rotating machinery (≥ 200mm shaft diameter) and is used for static displacement/dynamic vibration monitoring. It is paired with a preamplifier (such as CON021) to form a TSI system, and is widely used in the power, petrochemical, and metallurgical industries.
Technical Specifications
|
Manufacture |
EPRO |
|
Model |
PR6426/000-030 |
|
Description |
32mm Eddy Current Sensor |
|
Origin |
Germany |
|
Dimension |
24*17*6cm |
|
Weight |
0.55kg |
Working Principle
Electromagnetic Eddy Current Effect
Probe Excitation
The probe is equipped with a high-frequency coil. The preamplifier provides high-frequency alternating current, generating an alternating magnetic field.
Eddy Current Generation
When the magnetic field approaches the surface of the metal shaft, a closed vortex-like current (electromagnetic eddy current) is induced.
Impedance Modulation
The eddy current reversely weakens the original magnetic field, causing the impedance / amplitude of the coil to change with the probe - shaft gap (the smaller the gap, the stronger the eddy current, and the greater the amplitude attenuation).
Signal Conversion
The preamplifier demodulates the impedance changes into a voltage signal proportional to the gap (2V/mm), and outputs it to the monitoring system for display / alarm / protection.
Calibration
It is calibrated with 42CrMo4 steel standard at the factory. On-site, only the initial air gap (approximately 5.5mm) needs to be adjusted to be usable.
Application Advantages
PR6426/000-030 32mm Eddy Current Sensor
1. Non-contact measurement method
The probe has no mechanical contact with the surface of the shaft, which can reduce the impact of wear and is suitable for long-term operation scenarios.
2. Applicable for dynamic monitoring
It can reflect the vibration and displacement change trends of the shaft system during operation, and is suitable for use in the state monitoring system.
PR6426/000-030 32mm Eddy Current Sensor
3. Has good compatibility with the monitoring system
It is usually used in conjunction with the EPRO preamplifier and monitoring module, and can be integrated into a complete mechanical protection system.
4. Adapt to industrial operating environment
It can still maintain relatively stable measurement performance under industrial conditions such as temperature changes and vibrations (the specific performance depends on the installation and calibration conditions).
Parameter Details
| Parameters | Values | Remarks |
| Sensitivity | 2 V/mm (50.8 mV/mil) | Error ≤ ±1.5% |
| Linear range | ±4.0 mm (0.157") | Static displacement |
| Shaft diameter requirement | ≥ 200 mm (7.87") | For large steam turbines / compressors |
| Operating temperature | -35℃ ~ +180℃ | Short-term ( < 4h) can reach 200℃ |
| Probe pressure resistance | 6500 hPa (94 psi) | Adaptable to oil / gas environment |
| Frequency response | DC ~ 10 kHz | Dynamic vibration measurement |
| Target material | 42CrMo4 steel (standard) | Ferromagnetic metal |
| Explosion-proof grade | Eex ib IIC T6/T4 | Available in explosion-proof environment |
Typical application scenarios
Monitoring of steam turbine unit operation
Monitoring of industrial compressors' status
Monitoring of shaft systems of pump-type equipment
Vibration analysis system for fans and rotating machinery
Industrial condition monitoring and protection system