How to choose the hardness tester?

Question &#;1. Bench or portable hardness tester?

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There are two main types of hardness testers &#; bench (stationary,classical) and portable (mobile, electronic).

Bench hardness tester &#; is a classic hardness tester which is measuring the hardness by standard method of Brinell or Rockwell or Vickery or Shor and so on. As a rule, the name of the hardness tester includes the title of hardness scale. For example, &#;bench Brinell hardness tester&#; or &#;bench Rockwell hardness tester&#;. There are bench hardness testers that allow user to measure the hardness not only by one scale, but also by several hardness scales. For example, there are bench hardness tester which allows user to measured hardness by Rockwell, Brinell and Vickers scales. All Bench hardness testers are big and heavy (more than 50 kg), also these units should be installed on a table or floor. The main advantage of such devices &#; is implementation of the classic, direct method of measuring hardness.

Portable hardness testers &#; in contrast to the bench hardness testers, have small sizes, light weight and they are compact devices which measure the hardness by several hardness scales. Usually, the modern portable hardness testers can measure the hardness of all hardness scales. The advantage of portable hardness testers are allow users to take the device and get with it to the measuring samples. You needn&#;t take samples into the workshops. Portable hardness testers &#; is an electronic devices, so they usually have a set of useful features &#;user can save the results of measurements in the internal storage, after that the results can be transmitted to a computer for creating report of controlling in a specialized program ARM, which supplied with the portable hardness testers. Portable hardness testers &#; in contrast to the bench hardness testers, have a few advantages, but there are some cases, when they can be solved only by the bench hardness testers. However, such cases are very rare and we can say that in 99 cases out of 100, users can use portable device.

As a rule, the most useful and handy are portable devices. That&#;s why it is the best solution.

Question &#;2. Leeb, UCI or combined portable hardness tester?

Portable hardness testers can be divided into three types:

a) Leeb (dynamic, rebound, impact);

b) UCI (ultrasonic,contact-resonance, contact-impedance);

c) combined (UCI+Leeb).
 Leeb hardness testers are using the rebound method. The sensor of the device is installed on the sample. There is a peen in transducer (probe) of the device which hits the surface and after bounces off it. The device measures the speed of the peen before the impact and rebound speed after. The ratio of these speeds is multiplied by is called the number or Leeb hardness, by the name of the author who invented this method of measurement. Leeb hardness testers have one significant drawback, it is impossible to measure the hardness of samples that have weighing less than 5 kg, or thickness at the measurement place less than 10mm. In some cases, the hardness of these parts can be measured, grinding them to the massive slab through a layer of grease. But it is possible only in case if the shape of the sample allows to grind it.
 UCI hardness testers are using the ultrasonic contact impedance method. For measuring the sensor is installed on the sample and user has just to press on it. At the end of the sensor there is a diamond pyramid, which is embedded into the surface of the object to not a large depth (about 50 microns). This hardness method is very similar to the classical Vickers method, but uses a micro load, such as 1 kg, 5 kg or 10 kg. In contrast to the Leeb hardness testers such devices has almost no restrictions for the weight and thickness of samples. The UCI probe is used for measuring of the hardness of small items, objects with a thin wall, complex shape, and to measure the hardness of surface hardened layers. But you can not use UCI probe for measuring the hardness of non-ferrous metals, cast iron, coarse-grained materials, massive products etc.

 Combined portable hardness tester works with both (UCI (ultrasonic) and Leeb (dynamic)) probes. You will get the benefits of two methods of measurement &#; it is the maximum that can be obtained from portable hardness tester.

As for the price of devices, the Leeb hardness testers &#; are the most affordable, UCI &#; are a little more expensive. Combined hardness testers &#; are the most functional models, but, as a result they are also the most expensive.

So that, the second question is what is the method of measuring you need? If you are have enough financial opportunities, the best choice would be combined hardness tester. If your budget is limited you have to sacrifice functionality of the device and choose between UCI or Leeb hardness tester, considering the material and the dimensions of the mostly tested objects.

Question &#;3. The type and the method of measuring are have been chosen. How to choose the model of the device?

The model of portable hardness tester directly affects the usability of hardness tester. Depending on the chosen model of hardness tester, the functionality of the device can greatly different. So, the operating conditions of the instrument would be different. Choosing the model of hardness testers, consider the next functions: weight and size of the device; the size of the display and keyboard; ability to communicate with a PC; the ability to save the calibration settings, measurement results and other instrument settings; the ability to print the measurement results with the portable printer; ability to take photo of the measuring objects with reference to the measurement value at certain points on the testing object; and other.

The 2-nd model of the portable hardness tester has all the main technical capabilities, such as high accuracy of hardness measuring; basic hardness scales: Rockwell, Brinell and Vickers; ability to calibrate all scales + create custom scales of hardness; also it has the main essential operation functions, such as internal storage and communication with the PC; large bright display; extended operating temperature range of the device.

There are 3 portable hardness testers of 2-nd model:

1) Leeb Hardness Tester NOVOTEST T-D2

2) UCI Hardness Tester NOVOTEST T-U2

3) Combined Hardness Tester NOVOTEST T-UD2

The portable hardness testers of 2-nd model have all the main functions, like the best analogue of our competitors, but the price of our device is the lowest in the world among the all portable hardness testers with such functions set!

But, if user need a portable hardness tester with all modern operation functions, we can offer the 3-rd model of our portable hardness testers:

1) Leeb 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 next advantages:

&#; Small imprint after measuring ( which is important mirror surfaces of shafts necks, blades, gear teeth, etc.);

&#; Measuring the hardness of the surface hardened layer;

&#; Wide range of hardness;

&#; Various measurement modes;

&#; 88 combinations of materials and hardness scales (calibrations);

&#; Calibration of any scale in any range;

&#; Convenience and ease of measurement;

For more information, please visit Ultrasonic Hardness Tester for Sale.

&#; Optimized number of buttons;

&#; Large full color graphic display with bright back-lighting;

&#; Photo registering of measuring samples;

&#; Automatic recognition of probe;

&#; Type of connected probe indication;

&#; Calibrations stored in memory of probe;

&#; Extended temperature range (frost, down to &#; 40°C);

&#; Internal memory and connection with a PC;

&#; New, intuitive menu with tips on the buttons;

&#; Optional wireless mini printer;

&#; Water resistant case;

&#; Rubber bumper protected case;

&#; Internal clock;

&#; Hardness measurement of objects of any weight, with 1 mm wall thickness &#; inaccessible to the dynamic (Leeb) hardness testers (small parts, thin-walled structures, pipes, tanks, steel sheets, articles of complex shape, hardness control of metal coatings, etc.);

&#; The device has different operating modes:
Graph &#; the mode of building of graph
Histogram &#; the mode of building of histogram
Statistics &#; the mode of statistic
Smart &#; the mode of filtering of incorrect measurements
Signal &#; the mode of displaying of signal (only for Leeb probe)

The 3-rd model portable hardness testers is the most modern device in the word with the competitive price among the analogues.

So, we recommend the 3-rd model, because they has the most modern set of functions for a portable hardness testers in the world! So, if your budget is not constrained, the best choice would be the Combine Hardness Tester NOVOTEST T-UD3, but if the budget has some restrictions, we can confidently recommend the 2-nd model Portable hardness testers.

Hopefully this article would be help you to make the right choice of hardness tester!

If you have any questions, please contact us!

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Skype: novotest_world

: +38 067 593 59 77

Hardness is the material&#;s ability to withstand permanent indentation. This empirical test defines the hardness value of materials depending on their type. Therefore, the results must be labeled with the specific method used.

Testing is commonly used in inspection and process control. Outcomes help estimate mechanical properties such as tensile strength. This process is done with appropriate testing machines that match an indenter. The shape of the indentor differs according to the type of hardness test needed.

An ultrasonic hardness tester is one of the most common testing solutions available today. But another hardness tester that you can consider is the bench top hardness tester type. Knowing what makes the difference between these hardness testers can help you choose the right tool for your testing needs.

Choosing the Best Hardness Tester

Bench and portable are the two main types of hardness tester. The stationary and classical testing tools are examples of bench, while the mobile and electronic hardness testers belong to the portable type.

Here are some tips in choosing a hardness tester:

• Check if the device relies on ultrasonic vibration sensor rod. If it does, it means the tester can quickly determine the hardness value of the material including some metals without incurring damage.
• Test the speed and precision of the testing tool. An advanced sensing technology using a single chip can make more accurate and quicker measurement results unlike the typical hardness tester.
• Make sure the device supports value conversion. Before buying a hardness testing tool, check if it offers multi-point measurement. That way, precise printing and display of outcomes can be achieved.

Ultrasonic Hardness Tester vs. Bench Top Hardness Tester

Ultrasonic Hardness Tester

The ultrasonic portable hardness tester is an instrument that is lightweight and smaller in size. It&#;s a compact device that is designed to measure hardness using several scale violence. However, modern portable hardness testing tools are typically made to measure all types of scale violence.

One great advantage of using portable hardness tester is that it allows users to bring the device and measure samples anywhere they want. That means you can conveniently work on your projects without the hassles. Also, an electronic portable hardness tester offers useful features to make the process easier.

For instance, you can use the internal storage to save your measurement results. Then you can send the results to your computer so you can create a report through ARM control, a special feature designed for portable hardness testers. This is what makes an electronic portable hardness testing tool better than the bench top hardness tester.

Bench Top Hardness Tester

On the other hand, a bench top hardness testing device is a classical tester that is designed to measure hardness using standard methods like Vickery, Rockwell, Brinell, and Shor.

Some of the most common examples of this device include Bench Brinell hardness tester and Rockwell Bench hard tester. These tools will allow you to measure the value of hardness by scale as well as by some large hardness scale.

For instance, you can use a bench top hardness tester to determine hardness with Vickers, Brinell, and Rockwell scale. The only challenge in using this type of hardness testing tool is that it&#;s big and heavy, usually weighing 50 kilograms or even more.

Also, bench top hardness testers should be placed on the floor or mounted on a table. But these devices implement classical model which means you use direct method to accurately measure the hardness of any material.

Benefits of UCI Hardness Tester

The ultrasonic contact impedance hardness tester or commonly known as UCI hardness tester is made with a hand-held probe and host connected by a cable. The probe has a vibration bar that connects the pressure head of the Vickers. After the boot, the vibration bar creates the ultrasonic vibration.

Since the device relies on ultrasonic resonance, there will be no damage on your workpiece. But this is only one of the many benefits of using an ultrasonic hardness tester. More advantages of UCI hardness tester are listed below.

• Perfect for measuring products with higher surface requirements.
• An internal protection circuit is included to protect the device against interference.
• The device can also detect different materials by simply using similar material or elastic modulus to execute test blocks while adjusting the probe without the need for replacement.
• The in-built rechargeable battery has longer life so users can measure materials even without plugging into a power supply.
• It can be used in measuring and calculating various materials despite the differences in their value of hardness.
• There&#;s an optional plats for minimum workpiece detection. Meaning, you can modify the speed of detection according to your requirements.

But overall, an ultrasonic hardness tester is lightweight, smaller, and portable so you can accomplish your projects anytime and anywhere. You can use it in gears, bearings, and metal coating such as chrome layer, plating layer, carburizing layer, and nitriding layer.

Learn more by contacting our technical consultants or submitting a quote request.