Telebrineller - Measuring Brinell Hardness anywhere in the field, the plant or the laboratory.
A test bar of known BHN (Brinell Hardness Number),approximating the hardness of the specimen to be tested, is selected. Consistent accuracy is maintained when the test bar BHN is within + or -15% of the specimen BHN and is of the same general material. (Testing non-ferrous materials with carbon steel bars causes impact errors that must be compensated for by applying correction factors to the test results.) The test bar is inserted into the Telebrineller instrument and the instrument placed upon the specimen.
The Telebrineller instrument is complete with test bar(1), the anvil (2), encased in a soft molded rubber head (3),rests on the test bar. The rubber head and a similar resting block (4), provide non-skid footing. Below the test bar, a steel impression ball (5), secured in the base of the rubber head, is in contact with both the test bar and the specimen. The anvil is struck sharply with a two to five pound hammer. The impact, regardless of force, is transmitted equally to the test bar and, through the impression ball to the specimen metal (6),making impressions in both. The diameters of the resulting impressions are directly related to the respective hardness of the test bar and the specimen. A spacing bar (7), operated by a spring catch and button, adjusts the test bar to a clear area for each test.
Standard Telebrineller Test Bars are guaranteed to have a uniform hardness within plus or minus 2% of the BHN etched on the end of the bar. They are made of various alloys of carbon steel and finish ground to 9/16" square.
The diameters of the impressions are then measured and converted to BrinellHardness Numbers using a Brinell manual or automatic microscope. Automated microscopes such as the GenScope are computerized and calibrated systems in which the accuracy is traceable to the National Institute of Standards. The resulting Brinell HardnessNumbers are rounded to the nearest standard BHN occurring at a .05mm interval in TableI of ASTM Standard E10 and this BHN is etched on the end of the bar.
Please note the accuracy of any test made with the Telebrineller is dependent upon the relative hardness of the test bar and the test piece. When the Telebrineller is properly used, accuracy of ± 5% is consistently attainable, provided that the BHN of the test bar does not differ from the BHN of the test piece by more than 15%.
The test bars which are the core of this system are calibrated to a uniform hardness of ± 2% of the labeled BHN. Hardness of the bars is measured by equipment whose accuracy is certified traceable to theNational Standards Institute.Readings may be made within .05 millimeters.
|Telebrineller Hardness Test Bars (BHN Values)|
|Item #||Description of Part||Part No.|
|Ass'y||Telebrineller Bar Holder Assembly||239-35|
|2||Rubber Front Piece||239-18|
|4||Impression Ball - Standard||239-14|
|5||Impression Ball - Tungsten Carbide||239-29|
|9||Rubber Rear Piece||239-11|
|Not Shown||Flashlight (LED)||239-37|
|Calculation & Record Pad (25 Sheets)||239-33|
The Halteman File tester is designed for the Brinell hardness testing of fillet welds and other hard to reach areas. It is used in conjunction with the Telebrineller. For easier handling, it is recommended that the standard Telebrineller Test Bars be cut in half. Impressions can be measured by using the 5/8" diameter end of the microscope nose piece.
Yes! There are five bars included of your selected hardness. Simply inform us of your desired hardness values upon ordering your main unit and we will be happy to include them with your purchase!
We strongly recommend to purchase our calibration disc for checking the calibration of your microscope. Your telebrineller hardness testing system does not require calibration itself.
If you plan to perform a lot of tests, we strongly recommend purchasing additional impression balls. Over time, the ball can deform and cause out of round impressions. The calibration disc for checking your microscope is also a key component to making sure your telebrineller Brinell portable hardness tester is functioning accurately.
Absolutely! If you accompany your portable Brinell tester with the halteman filletester, you will be able to test fillet welds and other hard to reach areas.
The standard telebrineller test bars are guaranteed to have a uniform hardness within plus or minus 2% of the BHN etched on the end of the bar. By following the National Institute of Standards (NIST), we ensure every brinell steel test bar is prepared to provide only the most accurate results on your portable brinell hardness testing.
The use of the telebrineller hardness testing system is quite simple. The principle is to use a test bar of known hardness that is plus or minus 15% of your expected hardness value. The test bar is inserted into the cost effective portable hardness tester and the unit is placed on your specimen. Below the test bar sits an impression ball. The operator will strike the anvil with a hammer to indent both the specimen and the test bar. Using the microscope, you can then measure the diameter of indentation left on your specimen and compare it on the included chart to find your BHN brinell hardness value.
Each certified test bar typically allows 20 test indentations per side - giving you a total of 80 tests per bar. The spring loaded mechanism will adjust your test bar to a new location after you perform a test. This ensures your cheap telebrineller hardness tester is ready for its next test right away!
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