Overview
The WT-9HS Portable eddy current Flaw detector is a portable device for on-line and off-line flaw detection of metal tube bars, heat exchange tubes, and short shaft products. It uses an in-pass Probe to detect abnormalities such as inner wall defects, corrosion, and wall thickness thinning of the tube. It has an independent test channel, which can drive the combined Probe and collect data at the same time. It has high Sensitivity to axial defects such as longitudinal crazing, transverse defects, concealed and opening crazing. The instrument adopts a fully digitalization design, which can establish multiple standard inspection procedures, which is convenient for users to switch product specifications. It is equipped with input and output interfaces to realize connection and synchronization with field equipment, forming a highly automated system.
Features
1. Frequency range: 64Hz-2MHz;
2. Adjustable gain: 0-48db, step distance 0.5db;
3. Phase accuracy: 0-360 degrees, 1 degree step;
4. Independent Optional Frequency;
5. Multiple mode settings;
6. Automatic phase and amplitude analysis functions;
7. Automatic zero calibration system, which can set the zero calibration interval time;
8. A variety of alarm area settings, suitable for various modes.
9. Gain ratio range: 0.1-10;
10. Automatic Clear Screen and Tracking Impedance Display;
11. Detection signal playback and access functions;
12. Fast analog/digital electronic automatic equilibrating and dynamic tracking filtering;
13. Operating interface is simple and intelligent;
14. Adapt to a variety of Probes: external pass-through, pen Probe;
15. Applicable to metal pipes, rods and other parts online and offline inspection;
16. Fast digital processing;
17. Non-equal amplitude, asymmetric phase alarm area setting;
18. Display modes: Impedance, time base;
19. Digital filtering function;
20. Sound and light alarm output;
21. Automatic equilibrating time;
22. Internal and external clock selection;
23. Store a large number of test programs and test data.
24. eddy current signal playback expansion function;
25. Automatic recording of display defects;
26. Display mode: solid line, blanking;
27. Blanking display coefficient: 1~ 100;
28. Cartesian coordinate system and polar coordinate system background selection;
29. Automatic calendar and time display;
30. Liquid crystal displays;
31. Power supply: lithium battery can be used for 6-8 hours at a time;
32. Analog electronic equilibrating;
33. measurement of defect amplitude, phase, digital value.
Principle
Eddy current detection is based on the basic theory of electromagnetism. By establishing an alternating magnetic field close to a Probe with alternating current, the magnetic field interacts with the conductor to generate eddy current in the conductor. The eddy current itself generates a magnetic field, changing the strength of the original magnetic field, resulting in changes in voltage and Impedance. When the conductor is defective or the material changes, the eddy current strength and distribution are affected, which in turn causes changes in the detection coil voltage and Impedance, thereby indirectly detecting defects in the conductor.
Applications
Metal tube bar, heat exchange tube, short shaft products
Steps
1. Install the instrument at a fixed location in the workshop.
2. Ensure that the Ambient Temperature is within the range of minus 10~ 50 ° C;
3. Keep the environment relative humidity not more than 85%;
4. Connection power supply: 220V (allowable fluctuation range -20% to + 20%);
5. Select the Probe type as needed (such as external or pen Probe);
6. Set detection parameters, including Frequency, gain, phase, etc.;
7. Start the automatic zero calibration system and set the zero calibration interval;
8. Perform detection and observe the Impedance floor plan and time base scan in real time.
9. Determine defects based on sound and light alarm output.
10. Store detection data and programs, and play back signals if necessary.
Notice
The machine should be installed in a fixed place in the workshop for use.
• Ambient Temperature needs to be controlled at minus 10~ 50 ℃;
• environment relative humidity should not exceed 85%;
• Power supply voltage is 220V, allowing fluctuation range -20% to + 20%;
Make sure the lithium battery is fully charged before use, with a typical usage time of 6-8 hours.
• When adapting Probe, choose external pass-through or pen Probe;
• Pay attention to the automatic equilibrating and filtering settings when operating;
Regularly check whether the alarm function is normal.
• Avoid overwriting important detection procedures when storing data.
