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The D-2 is an advanced pocketable hardness tester distinguished by its high accuracy, wide measuring range, simplicity of operation & above all it is a really portable instrument operating on three pencil cells of size AA. It is suitable for testing the hardness of many materials & finds applications for hardness testing in many areas of industry.
Measuring Method : The measuring principle is based on absorption of kinetic energy & its relation in conventional scales of hardness. This is achieved with help of the probe, wherein a small body with a hard tip is propelled against the test surface by a spring & latch arrangement. The motion of body is the measure of its kinetic energy. The instrument converts the signal of absorbed energy in to a chosen scale of conventional hardness.
Typical applications for hardness testing with the portable hardness
taster
1) In-situ hardness testing of individual parts or components in assembled machine.
2) Hardness testing of mould surface of a die.
3) Hardness testing of heavy components like rolls of rolling mill or sugar industry or paper industry.
4) Hardness testing of heavy pressure vessels.
5) Hardness testing of production line of components like crank shafts, cylinder blocks.
6) Checking hardness of material in stock.
7) Hardness testing when required in failure analysis.
Functions available on the display of Indicating Instrument of the portable hardness
tester
1) Display of hardness in various conventional scales of hardness as given in chart below for the standard probe.
2) The instrument has compensation for the angle of probe with respect to vertical while testing.
3) Immediate conversion between available conventional scales of hardness.
4) Standard deviation & average results up to nine readings can be taken.
5) The readings can be recorded & recalled for later viewing. The max capacity being 500 readings.
The readings are stored serially & the serial number being displayed. There is a batch number facility
as well to distinguish from batch to batch. The entire batch readings can be cleared or the batch number can
be reset using the specific keys.
6) The machine calibration can be done using the keyboard & there is no need of any expertise to recalibrate
the machine.
7) Serial port (RS 232) or printer port (Centronics Compatible) is available on request.
The available conversions to conventional scales of hardness & their range displayed by the instrument for the standard probes for the metals given
below :
| Probe Type |
Material |
Vickers |
Brinell |
Rockwell B |
Rockwell C |
Scheloroscopic |
| D/DC |
Steel, Cast Steel |
83
976 |
93
674 |
60
100 |
18
68 |
32
100 |
| D/DC |
Cold Work Tool Steel |
80
898 |
|
|
20
70 |
|
| D/DC |
Grey Cast Iron |
|
93
334 |
|
|
|
| D/DC |
Nodular Cast Iron |
|
131
387 |
|
|
|
| D/DC |
Cast
Alluminium Alloys |
|
27
159 |
|
|
|
| D/DC |
Copper/Zinc
Alloys (Brass) |
|
40
173 |
|
|
|
| D/DC |
Cu Al/Cu Sn
Alloys (Bronze) |
|
60
290 |
|
|
|
| D/DC |
Wrought Copper |
|
45
245 |
|
|
|
| D/DC |
Stainless Steel |
85
800 |
85
650 |
49
99 |
20
62 |
|
| D/DC |
Carbon Graphite |
|
|
|
|
35
99 |
| G |
Steel, Cast Steel |
|
90
640 |
48
99 |
|
|
| G |
Grey Cast Iron |
|
95
320 |
|
|
|
| G |
Nodular Cast Iron |
|
130
360 |
|
|
|
| C |
Steel, Cast Steel |
|
|
|
20
70 |
|
Technical Specifications of the Indicating instrument Portable hardness tester Model D-2.
1) Overall dimensions of the indicating Instrument:- 150mm. long,70mm. wide, 50mm. high approx.
2) Weight of the instrument.:- 500 Gms. approx.
3) Operating Temp:- 15 degree to 45 degree centigrade
approx. (Type Test report available)
4) Measuring accuracy:- Mean uncertainty +/- 2.0 % (corresponding to +/- 1.6 HRC at 58 HRC)
on standard test block. Or +/- 10 BHN on brinell test block.
5) Operates on three dry pencil cells of size AA. |
| Technical Specifications of the probes available for the Portable hardness tester Model D-2. |
|
Field of Application |
Probe Type D/DC |
Probe Type G |
Probe Type C |
|
Measuring Range
: |
|
|
|
|
Brinell |
30-650 |
90-650 |
------- |
| Vickers |
80-940 |
-------- |
------- |
| Rockwell C |
20-70 |
-------- |
20-70 |
|
Scheleroscopic |
32-100 |
-------- |
------- |
| Preparation of Test Surface Required
: |
|
|
|
|
ISO |
N7 |
N9 |
N5 |
|
Max. Roughness Depth, Rt. |
10 Micron |
30 Micron |
2.5
Micron |
|
Average Roughness
Depth=Ra=CLA=AA |
2 Micron |
7
Micron |
0.4
Micron |
| Minimum Weight of Component
: |
|
|
|
|
Of Compact Shape |
5Kg. |
15Kg. |
1.5Kg. |
|
On a Solid Support |
2-5Kg |
5-15Kg |
0.5-1.5Kg. |
|
Coupled |
0.1-2Kg. |
0.1-5Kg. |
0.1-0.5Kg. |
| Minimum Thickness of Coupled Component |
5 mm |
15 mm |
1 mm |
| Minimum Thickness of Layer for Surface Hardened
Component |
0.8 mm |
-------- |
0.2 mm |
| Indentation on Component with 300 Brinell Hardness |
|
|
|
|
Dia. |
0.54 mm |
1.02 mm |
0.39 mm |
|
Depth |
12.2 Micron |
43.8 Micron |
6.4 Micron |
| The Grit of Grinding Wheel Suggested for Surface of Preparation of Component |
200 |
65 |
500 |
| Height of Probe |
150 mm. (D type) |
250 mm |
150 mm |
| |
100
mm (DC Type) |
|
|
|
(Specifications subject to change without notice.)
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