Acoustic control systems A1207 Operation Manual
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Contents
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ULTRASONIC THICKNESS GAUGE - A1207 (A1207C)Acoustic Control Systems, Ltd.Moscow, 2006196. SOME NOTES ON OPERATIONFactors that can influence the operation of the device and exactness of readings.State of the surface.Loose or exfoliating rust, corrosion or dirt on the surface of testing object can influencethe ultrasound transmission to the material. That’s why before measuring on such asurface you need to clean it from rust and calx and put more contact liquid then whentesting on flat surfaces.Cleaning of the rough corroded surfaces can not only make the readings more exact butalso it can prolong the life-time of the ultrasonic probe.If there is a thick layer of paint on the surface and the paint started to exfoliate, it is alsonecessary to remove it. The thick paint reduces the level of signal and can make a falseecho, and that courses to the wrong readings of the device. The measuring can be madethrough a thin layer of paint that is about 0,1 – 0,3 mm. But you will have to take into theaccount that the thickness of the paint layer will be added to the result of measuring.How you put the probe on the surface.To have a good transmission of the ultrasound into the material you need to press theprobe tightly to the surface of the object.When you measure the wall thickness of cylindrical objects, especially of smalldiameters, it is recommended to use tough contact liquids and put more liquid on thepoint of contact. Electro-acoustic screen (that is the line on the operating surface of theprobe) in A1207 should be directed perpendicular to the tube’s axle. Pressing the probeto the tube’s surface and watching the readings of the device, you need to lean the probefrom side to side in the plane perpendicular to the tube’s axle. Move the probe step bystep along the tube’s wall, do not slide with it. The device’s readings when leaning fromthe middle are increasing a little.For a real thickness of the wall take the minimal stabile reading of the device atcontacting the tube’s wall with the middle of the probe’s operating surface. When theprobe leans strongly from this position the readings of the device will change in leaps andbounds.Objects with double convex curvature (tube’s turning, spherical coverings and so on) –are the most difficult for testing, because the contact with them is only possible in onepoint. The probe should contact the object with the middle of it’s operating surface.Non-parallelism or eccentricity.If the external and internal surfaces of the testing material are not parallel or are eccentricto each other, then the reflected wave (the echo-pulse) deviates from the necessarydirection and the exactness of readings decreases. |
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