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release time : 2021-04-14 15:03:31
There are two main types of hardness testers: desktop (fixed, classic) and portable (mobile, electronic).
Portable hardness testers can be divided into three types:
a) Layup (dynamic, rebound, impact);
b) UCI (ultrasonic, contact resonance, contact impedance);
c) Merger (UCI + Leeb). Leeb Hardness Tester
The rebound method is being used. The sensor of the device is mounted on the sample. The device's transducer (probe) has a pointed tip that hits and bounces off the surface. The device measures the speed of the striker before the impact and the speed of the rebound after the impact. The ratio of these speeds multiplied by 1000 is the so-called number or Leeb hardness, the name of the author who invented this measurement method. An important disadvantage of the Leeb hardness tester is that it cannot measure the hardness of samples with a weight of less than 5 kg or a thickness of less than 10 mm at the measurement location. In some cases, you can measure the hardness of these parts and grind them into lumps through a layer of grease. But it is only possible if the shape of the sample allows grinding.
The UCI hardness tester is using the ultrasonic contact impedance method. In order to measure, the sensor is installed on the sample, and the user only needs to press it. There is a diamond-shaped pyramid at the end of the sensor, which is not deeply embedded in the surface of the object (about 50 microns). This hardness method is very similar to the classic Vickers method, but uses a micro load such as 1 kg, 5 kg or 10 kg. Compared with the Leeb hardness tester, this type of equipment has almost no restrictions on the weight and thickness of the sample. The UCI probe is used to measure the hardness of small objects, thin-walled objects with complex shapes, and to measure the hardness of the hardened surface layer. But you cannot use UCI probes to measure the hardness of non-ferrous metals, cast iron, coarse-grained materials, bulk products, etc.
The combined portable hardness tester can be used with (UCI (ultrasonic) and Leeb (dynamic)) probes. You will get the benefits of both measuring methods-this is the maximum value that can be obtained from a portable hardness tester.
As for the price of the equipment, the Leeb hardness tester is the cheapest UCI, which is slightly more expensive. Combined Hardness Tester-is the most powerful model, but therefore, they are also the most expensive.
Therefore, the second question is what measurement method do you need? If you have enough economic opportunities, the best choice is a combination hardness tester. If your budget is limited, you must sacrifice the functionality of the equipment and choose between UCI or Leeb hardness testers, taking into account the material and size of most test objects.
Question №3. The type and measurement method are selected. How to choose the model of the device?
The model of the portable hardness tester directly affects the usability of the hardness tester. Depending on the selected hardness tester model, the function of the device may vary greatly. Therefore, the operating conditions of the instrument will be different. To select the model of the hardness tester, please consider the following functions: the weight and size of the device; the size of the display and keyboard; the ability to communicate with a PC; the ability to save calibration settings, measurement results and other instrument settings; the ability to print the measurement results using a portable printer ; Able to take pictures of the measuring object with reference to the measured value at certain points of the test object; and others.
The 2-ND model portable hardness tester has all the main technical capabilities, such as high accuracy of hardness measurement; basic hardness levels: Rockwell, Brinell and Vickers; the ability to calibrate all scales + create customized hardness scales; it also has The main basic operating functions, such as internal storage and communication with the PC; a bright large display; expand the operating temperature range of the device.
There are 3 portable hardness testers in 2 models:
1) Leeb hardness tester NOVOTEST T-D2
2) UCI hardness tester NOVOTEST T-U2
3) Combined hardness tester NOVOTEST T-UD2
Type 2 portable hardness tester has all the main functions, *like our competitors' similar products, but among all portable hardness testers with this function, our equipment price is the lowest in the world!
However, if the user needs a portable hardness tester with all modern operating functions, we can provide a third model of the portable hardness tester:
1) Richter hardness tester NOVOTEST T-D3
2) UCI hardness tester NOVOTEST T-U3
3) Combined hardness tester NOVOTEST T-UD3
The 3-RD model device has the following advantages:
•The footprint after measurement is very small (this is an important mirror surface for journals, blades, gears, etc.);
•Measure the hardness of the hardened surface layer;
•Wide hardness range;
• Multiple measurement modes;
• Combination of 88 materials and hardness scale (calibration);
• Calibrate any scale in any range;
• Convenient and easy to measure;
• Optimized number of buttons;
•Large full-color graphic display with bright backlight;
• Record the photo of the measured sample;
• Automatically identify the probe;
• The connected probe indicates the type;
• The calibration is stored in the memory of the probe;
• Extended temperature range (frost, as low as -40°C);
• Internal storage and connection with PC;
• New, intuitive menu with prompts on the buttons;
• Optional wireless mini printer;
• Waterproof box;
•Rubber bumper protection cover;
• Internal clock;
• Hardness measurement of any weight object with a wall thickness of 1 mm-Dynamic (Leeb) hardness tester (small parts, thin-walled structures, pipes, tanks, steel plates, complex shapes, hardness control of metal coatings) cannot be accessed, etc. );
•The equipment has different operating modes:
Graphics-the construction of graphics
Histogram-the construction of histogram
Smart mode-filter wrong measurement values
Signal-signal display mode (only for Richter probe)
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