Description
Bently Nevada 330104 - 00 - 13 - 10 - 02 - CN is an 8mm proximity probe in the 3300 XL series, that is, an 8-millimeter eddy current sensor probe, which is commonly used for the condition monitoring of industrial equipment.
Features and Advantages
High-precision Measurement: Adopting advanced eddy current measurement technology, it can accurately measure the distance change between the measured object and the probe. The precision can meet the requirements of most industrial applications, providing accurate data support for equipment condition monitoring.
High Reliability: It has good anti-interference ability and can work stably in complex industrial environments, reducing measurement errors and data fluctuations. Its structural design is sturdy and durable, adapting to harsh working conditions such as high temperature, high humidity, vibration, etc. It can operate reliably for a long time, reducing maintenance costs and downtime.
Non-contact Measurement: During the measurement process, there is no need to directly contact the measured object, avoiding wear and damage to the surface of the measured object. At the same time, it also reduces the measurement errors caused by contact. It is suitable for various rotating and reciprocating motion equipment, such as motors, compressors, steam turbines, etc.
Working Principle:
1. Generation of Alternating Magnetic Field: There is usually a coil inside the eddy current sensor probe. When the sensor is in operation, a high-frequency alternating current (generally with a frequency ranging from several kilohertz to several megahertz) is passed through this coil. According to the principle of electromagnetic induction, a coil with an alternating current will generate an alternating magnetic field around it.
2. Generation of Eddy Currents: When this alternating magnetic field approaches a conductive metal object (such as the rotating shaft, gear, etc. of equipment), due to the electromagnetic induction effect, an induced electromotive force will be generated on the surface of the metal object. Since the metal object itself is conductive, under the action of the induced electromotive force, a circular current, that is, an eddy current, will be formed on the surface of the metal object.
3. Formation of the Reaction Magnetic Field: The eddy current will also generate an alternating magnetic field opposite to the magnetic field direction of the probe coil. This reaction magnetic field will affect the magnetic field distribution and magnetic flux of the probe coil. Specifically, the reaction magnetic field generated by the eddy current will change the equivalent impedance of the probe coil.
4. Relationship between Distance and Impedance: The change in the equivalent impedance of the probe coil is closely related to the distance between the probe and the metal object. Generally speaking, when the distance between the probe and the metal object decreases, the eddy current will increase, the reaction magnetic field will be enhanced, and the equivalent impedance of the probe coil will decrease; conversely, when the distance increases, the eddy current decreases, the reaction magnetic field weakens, and the equivalent impedance increases.
5. Signal Conversion and Output: By detecting the change in the equivalent impedance of the probe coil, the internal circuit of the sensor can convert it into a corresponding electrical signal (such as a voltage or current signal). The magnitude of this electrical signal has a certain functional relationship with the distance between the probe and the metal object. After further signal processing and amplification, the output electrical signal can be collected and analyzed by the monitoring system, thus realizing the measurement of the distance between the metal object and the probe, and further used to monitor the operation parameters of the equipment such as displacement, vibration, and rotational speed.
Technical Parameters
Measurement Range: Usually about 0 - 10mm, and the specific measurement range may vary depending on the model and configuration.
Linearity: Generally, a high linearity can be achieved, for example, ±1% or better, to ensure the accuracy and reliability of the measurement results.
Sensitivity: It has high sensitivity and can detect tiny distance changes, usually at the level of several millivolts per micrometer (mV/μm).
Operating Temperature: It can work within a relatively wide temperature range, generally from -20°C to +120°C, and some special models can adapt to more extreme temperature conditions.
Output Signal: Usually a DC voltage signal, such as -2V to -18V or 0V to 10V, etc. There may also be other types of output signals, such as current signals or digital signals, specifically depending on the configuration and application requirements of the probe.
Application Fields
Power Industry: It is used for the shaft displacement and vibration monitoring of large rotating equipment such as generators and steam turbines, to detect potential faults of the equipment in a timely manner and ensure the safe and stable operation of power equipment.
Petrochemical Industry: It is applied to equipment such as compressors and pumps to monitor the operation status of the equipment and prevent production interruptions and safety accidents caused by equipment failures.
Metallurgical Industry: It monitors the displacement and vibration of key components of equipment such as blast furnaces and converters, providing a basis for the maintenance and repair of the equipment, and improving the service life and production efficiency of the equipment.
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