The D21 is an advanced pocket sized hardness tester distinguished by its high accuracy, wide measuring range, simplicity of operation & above all, its portability. It runs on two AA Batteries. It is suitable for testing the hardness of a large number of materials & finds applications for hardness testing in many areas of industry.

Typical applications of our Portable Hardness Tester Model D21:

- In-situ hardness testing of individual parts or components in assembled machine.
- Hardness testing of mould surface of a die.
- Hardness testing of huge components in heavy engineering industries.
- Hardness testing of rollers in rolling mills or sugar industry or paper industry.
- Hardness testing of heavy pressure vessels.
- Hardness testing of components in production line like crank shafts, cylinder blocks, cylinder heads, Disc Brakes, etc.
- Checking hardness of material in stock.
- Hardness testing when required in failure analysis.

Features of our Portable Hardness Tester Model D21:

- Display of hardness in various conventional scales of hardness.
- Compensation for the angle of probe with respect to vertical while testing.
- Immediate conversion between available conventional scales of hardness.
- Average result of up to nine readings can be taken with the standard deviation.
- The readings can be saved for later viewing, the max capacity being 500 readings. The readings are stored serially with the serial number being displayed. There is a batch number facility as well to distinguish the readings from batch to batch. The entire batch readings can be cleared or the batch number can be reset using specific keys.
- The calibration can be done using the keyboard & there is no need of any expertise to recalibrate the machine.
- Serial port (RS 232) or printer port (Centronics Compatible) is available on request.
- Highly energy efficient. Runs on two AA sized pencil cells.

Technical Specifications of the Indicating instrument Portable hardness tester Model D 2.1:

1) Overall Dimensions of the Indicating Instrument: 150mm. long,70mm. wide, 50mm. high approx.
2) Weight of the instrument: 500 gm. 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 the Standard Test Block. Or +/- 10 BHN on Brinell Test Block.
5) Operates on Two AA Size Batteries.

Technical Specifications of he Probes available for the Portable Hardness Tester Model D 2.1.

Field of Application Probe Type D/DC Probe Type G Probe Type C
Measuring Range:
Brinell
Vickers
Rockwell C
Scheleroscopic

30-650
80-940
20-70
32-100

90-650
-
-
-

-
-
20-70
-
Preparation of Test Surface Required:
ISO
Max. Roughness Depth, Rt.
Average Roughness Depth=Ra=CLA=AA

N7
10 Micron
2 Micron

N9
30
7

N5
2.5 Micron
0.4 Micron
Minimum Weight of Component:
Of Compact Shape
On a Solid Support
Coupled

5 Kg
2-5 Kg
0.1-2 Kg

15
5-15 Kg
0.1-5 Kg

1.5 Kg
0.5-1.5 Kg
0.1-0.5 Kg
Minimum Thickness of Coupled Component
Minimum Thickness of Layer for Surface Hardened Component
5 mm
0.8 mm
15 mm
-
1 mm
0.2 mm
Indentation on Component with 300 Brinell Hardness:
Dia
Depth

0.54 mm
12.2 Micron

1.02 mm
43.8 Micron

0.3 mm
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)
100 mm. (DC Type)
250 mm 150 mm

(Specifications subject to change without notice.)

Technical Specifications of he Probes available for the Portable Hardness Tester Model D 2.1.

Probe Type Material Vickers Brinell Rockwell B Rockwell C Scheloroscopic
D/DC Steel, Cast Steel 80
947
66
654
38.4
99.8
19.8
68.2
32.5
99.5
D/DC Cold Work Tool Steel 80
898
    20.7
67.1
 
D/DC Grey Cast Iron   93
332
     
D/DC Nodular Cast Iron   131
387
     
D/DC Cast Aluminum Alloys   30
159
     
D/DC Copper/Zinc Alloys(Brass)   40
174
13.5
95.7
   
D/DC Cu Al/Cu Sn Alloys(Bronze)   60
290
     
D/DC Wrought Copper   45
317
     
D/DC Wrought Copper       19.6
62.4
 
D/DC Carbon Graphite         32.5
99.5
G Steel, Cast Steel   90
651
47.7
99.9
   
G Grey Cast Iron   97
347
     
G Nodular Cast Iron   127
364
     
G Steel, Cast Steel       18.2
69.5
 
E Steel, Cast Steel       11.2
55.8