Español Español   
ENGLISH ENGLISH   
Products > Portable Hardness > Leeb Hardness Tester > Portable Hardness Tester
Product : Portable Hardness Tester
Model : DH250
Country of Origin : CHINA
Brand : DTEC
Quality Certified : CE,GB/T 17394-1998, ASTM A956
Delivery Time : 3 days
Packing Weight : 6KG
Dimension : 37x30x12cm(LxWxH)
Package Type : Maker's Standard Export Carton
Courier : DHL/TNT/FedEx/UPS/EMS/Shipping Agent
Payment Term : TT100%/Private Bank Account/L/C/Paypal/Western Union
 Enlarge Image                   Back
←[Previous Product]              [Next Product]→


  • Product Intro
  • Feature
  • Specification
  • Packing List
DH250 Portable Hardness Tester is an advanced and innovative metal hardness testing instrument, which has many functions such as nice appearance, easy-operated, integrated design, high resolution display, low
operation temperature and high accuracy etc. 
It is applicable to big workpiece on-site hardness testing and batch testing on the workpiece in production lines. 
Moreover, it is also used in metal manufacturing industry, transportation, power station, petrochemical industry, aircraft industry, construction and lab, etc.




Working Principle:
When the impact body,with a certain weight,impacts against the specimen surface under the action of spring force,leeb hardness comes from the ratio of the impacting velocity(VA) and the rebounding velocity(VB) of the impact body by the moment the spherical testing tip is located at 1mm point from specimen surface.
With principle of electromagnetism,the permanent magnet in the coil of impact device produced an induced voltage, which is in proportion to the impact body velocity.
The leeb hardness values are calculated by the following formula:

HL=1000X(Vb/Va)



Using Scopes:
Die cavity of molds.
Bearings and other parts.
Failure analysis of pressure vessel, steam generator and other equipment.
Heavy work piece.
The installed machinery and permanently assembled parts.
Testing surface of a small hollow space.
Material identification in the warehouse of metallic materials.
Rapid testing in large range and multi-measuring areas for large-scale work piece.



►6 selectable impact devices(D/C/G/DC/DL/D+15) available for special usage, automatically identify the type of impact devices;

►6 exchangeable hardness scales (HRB/HRC/HV/HB/HS/HL),measurable for the hardness strength σb;

►8 kinds of material available, suitable to measure the hardness of all metallic materials;

►600 groups storage capacity, including 0-7 measured value, average value, testing data, impact direction, impact times, material and hardness scale etc.;

►High contrast segment liquid crystal display, displaying figures, with EL background light;

►With standard data processing software and USB cable, enable to connect to PC and make further data analysis;

►High accuracy in any impact direction (360°), automatically identify impact direction as well as impact device type and gravity compensation;

►Excellent after-sale service system for high quality products,easy to buy and convenient to use.

Testing Range

HLD(200-960),HRC(19.8-68.5), HRB(13.5-100), HB(30-651), HV(80-976), HS(26.4-99.5), σb (375-2639).

Hardness Scale
HL, HB, HRB, HRC, HV, HS, σb.
Impact Device
Standard Type: D, Optional Type: C/G/DC/DL/D+15
Accuracy
±6HLD (HLD=800), Repeatability: <6HLD (HLD=800)
Resolution

1HL, 1HV, 1HB, 0.1HRB, 0.1HRC, 0.1HS

Testing Direction
360 Degree by Manual Setting
Display

High Contrast Segment Liquid Crystal Display (Display Only Figure), LED Backlight.

Available Material

Steel& Cast Steel, Stainless Steel, GC iron, NC iron, Cast Aluminum alloy, Copper-zinc alloy, Copper-tin alloy, Brass.

Storage

600 Groups (each group include 1-7 testing results and 1 average value)

Communication

Standard: USB port , Optional: Bluetooth

Working Temp.
-10°C—+50°C
Power Supply
2 AA Batteries
Dimension
37x30x12cm (LxWxH)
Packing Weight
About 6.0 KG
Quality Standard
GB/T 17394-1998, ASTM A956

























Error and Repeatability of Displayed Value: 

No.
Type of impact device

Hardness value of Leeb standard hardness block

Error of displayed value

Repeatability
1
D
760±30HLD
530±40HLD
±6 HLD
±10 HLD
6 HLD
10 HLD
2
DC
760±30HLDC
530±40HLDC
±6 HLDC
±10 HLDC
6 HLD
10 HLD
3
DL
878±30HLDL
736±40HLDL
±12 HLDL
12 HLDL
4
D+15
766±30HLD+15
544±40HLD+15
±12 HLD+15
12 HLD+15
5
G
590±40HLG
500±40HLG

±12 HLG

12 HLG

6
E
725±30HLE
508±40HLE

±12 HLE

12 HLE

7
C
822±30HLC
590±40HLC
±12 HLC
12 HLC
 

Testing Range in Different Materials with Different Impact Devices:

Material
Method
Impact device
D/DC
D+15
C
G
E
DL
Steel and cast steel
 
HRC
20~68.5
19.3~67.9
20.0~69.5
 
22.4~70.7
20.6~68.2
HRB
38.4~99.6
 
 
47.7~99.9
 
37.0~99.9
HRA
59.1~85.8
 
 
 
61.7~88.0
 
HB
127~651
80~638
80~683
90~646
83~663
81~646
HV
83~976
80~937
80~996
 
84~1042
80~950
HS
32.2~99.5
33.3~99.3
31.8~102.1
 
35.8~102.6
30.6~96.8
Cold work
tool steel
HRC
20.4~67.1
19.8~68.2
20.7~68.2
 
22.6~70.2
 
HV
80~898
80~935
100~941
 
82~1009
 
Stainless steel
 
HRB
46.5~101.7
 
 
 
 
 
HB
85~655
 
 
 
 
 
HV
85~802
 
 
 
 
 
Grey cast iron
 
HRC
 
 
 
 
 
 
HB
93~334
 
 
92~326
 
 
HV
 
 
 
 
 
 
Nodular cast iron
HRC
 
 
 
 
 
 
HB
131~387
 
 
127~364
 
 
HV
 
 
 
 
 
 
Cast aluminum alloys
HB
19~164
 
23~210
32~168
 
 
HRB
23.8~84.6
 
22.7~85.0
23.8~85.5
 
 
BRASS(copper-zinc alloys)
 
HB
40~173
 
 
 
 
 
HRB
13.5~95.3
 
 
 
 
 
BRONZE(copper-aluminum/tin alloys)
HB
60~290
 
 
 
 
 
Wrought copper alloys
HB
45~315
 
 
 
 
 
 
 Testing Parameter of Impact Devices:


Standard Packing:


 
No.
Items
Qty.
1
DH250 Main Unit
1
2
D Type Impact Device
1
3
Standard Hardness Block
1
4
Cleaning Brush
1
5
Small Support Ring
1
6
2 AA Battery
1
7
Protective Rubber Sheath
1
8

Manual, Warranty Card, Quality Certificate

1 each
9
Data Pro Software and USB Cable
1
10
Package Case
1

 
Optional Accessories:
No.
Items
Notes
1
Impact Device
(D/C/G/DC/DL/D+15)
2
Impact Body
For all Types: D/C/G/DC/DL/D+15
3
Cable for Impact Device
1.5M long,3-pin cable
4
Supporting Ring

Standard Type and Special Type, 12pcs/set

5

Data Processing Software & USB Cable

 
6

Standard Leeb Hardness Testing Block

750-850HLD,590-670HLD,490-570HLD,550-630HLG,460-540HLG
7

Blue Tooth Wireless Thermal Mini Printer

 
8
Belt
1.2 M Long
9
Instrument Case
35x28x10cm(LxWxH)

Impact Devices(D/C/DC/DL/D+15/G)






3-Pin Cable for Impact Device
 (D/C/DC/DL/D+15/G), 1.5M in length



Impact Body
 (D/C/DC/DL/D+15/G)
 


Supporting Rings(12 pcs. each set)


Specification of Supporting Rings:

Data Processing Software (including USB cable)


Standard Leeb Hardness Testing Block
Items
Size
Dimension
Product Picture


Leeb Hardness Standard Block

750-850HLD

Ф 90 × 55 mm
2.75KG Each

 

590-670HLD
490-570HLD
550-630HLG

Ф120 × 70 mm
6.4KG Each

460-540HLG

AA Grade Leeb Hardness Standard Block

750-850HLD

Ф 90 × 55 mm
2.75 KG Each


 
 
590-670HLD
490-570HLD
550-630HLG

Ф120 × 70 mm
6.4 KG Each

460-540HLG