I. Overview
The eddy current displacement amplitude measuring instrument is a non-contact measuring instrument made according to the eddy current principle, which is composed of a sensor, an indicator and an accessory micrometer. The eddy current sensor has the characteristics of large measurement linear range, independent of the medium between the measured body and the sensor, small size, easy installation, strong anti-interference ability, etc. It can be widely used to measure various types of aircraft engines, turbines, compressors, motors The axial displacement and radial vibration of the rotating machinery and the trajectory of the shaft can also be applied to various other occasions where displacement and vibration need to be measured.
The instrument has single-channel, two-channel and six-channel, etc., users can choose sensors with different ranges and instruments with different measurement channels according to their needs. Each channel has terminals for displacement output, amplitude output, and amplitude level output. (The displacement measuring instrument has only displacement output terminals) It can be connected with digital voltmeter, oscilloscope, recorder, spectrum analyzer and other instruments for observation. The measuring instrument directly displays the displacement value or amplitude peak-to-peak value of the measured body.
2. Model Specifications
model
Measurement target
Number of channels
Display method
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Main configuration
Dimensions mm
ZW-1D
Displacement
1
31/2 LED
Have
Each channel is equipped with:
A set of sensors and preamplifiers (range is determined by the user)
Low noise cable 10 meters
One instrument with more than two channels and one static calibrator
80 * 160 plate pack
ZW-2D
Displacement
2
31/2 LED
Have
140 * 360 * 320
ZW-6D
Displacement
6
31/2 LED
no
140 * 400 * 360
ZZF1-D
Displacement, amplitude
1
31/2 LED
Have
80 * 160 plate pack
ZZF2-D
Displacement, amplitude
2
31/2 LED
Have
140 * 360 * 320
ZZF6-D
Displacement, amplitude
6
31/2 LED
no
140 * 440 * 400
3. Main technical indicators
1. Linearity: <± 0.5 ～ 4% (FS). (That is, the linearity of the sensor)
2. Frequency response: 0-10KHz
3. Resolution: 0.1% (FS)
4. Minimum display value:
Range <4mm: 0.001mm
Range> 4mm: 0.01mm
5. Alarm and shutdown characteristic error:
5% ~ 100% of each range of setting range, error ≤ ± 1%
6. Full scale output:
Displacement output: ï¼5V ~ 0 ~ ＋ 5V
Amplitude output: 0 ～ 3.6V .AC.
Amplitude level output: 0-2V DC .. (frequency less than 10Hz, the reading may not be stable)
7. Operating environment: Sensor: -20 ℃ ～ ＋ 100 ℃
Converter and measuring instrument: -10 ℃ ～ ＋ 45 ℃
8. Insulation resistance: ≥100MΩ
9. Power supply: 220V ± 10% 50Hz ± 5%
10. Power consumption: 20VA ～ 45VA
11. Instrument warm-up: not less than 20 minutes
4. Working principle
1. Sensors and transducers
According to the principle of electromagnetic induction, when the magnetic flux in a metal conductor changes, an induced current will be generated in the conductor, so that the streamline of the current closes itself in the metal body, usually called eddy current, and the generation of eddy current is inevitable To consume a part of the magnetic field energy, so that the impedance of the magnetic field coil changes, the principle of the eddy current sensor is based on this eddy current effect, which uses this eddy current effect to convert the change in distance into a change in electricity.
The converter provides a high-frequency excitation signal for the sensor, so that a high-frequency alternating magnetic field is generated in the working area of ​​the sensor. Through the reasonable matching of the converter and the sensor, the measured (displacement, amplitude or other parameters) and the electric quantity are completed ( Voltage), the sensor and the converter should be connected by number, not interchangeable, please pay attention to the user, and the converter and the measurement
Related downloads
The performance and use of ZZF series eddy current displacement amplitude measuring instrument.doc
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