Portable Hardness Tester EMHT-20

Easy to Use Dynamic Metal Hardness Tester
including external Probe and Calibration Block

Portable Hardness Tester EMHT-20
  • Wide measurement range in Hi value. Direct display of converted values 
    Rockwell HRB . HRC . Vickers HV . Brinell HB . Shore HS
  • Quick , reliable and simple operation.
  • High Accuracy + or - 0.5%
  • Impact device which can be used at any angle, even upside down
  • Data Output RS232 and internal memory in a batch of 1250 average readings
  • For most metals
  • Date and time display
  • Lower and Upper limits setting with Low-High displayjudge
  • Conforms to ASTM A956
  • Works on standard AAA batteries ; Auto-off power saverafter two minutes.
  • Optional Impact devices for specialist applications

Technical Specifications

Hardness Parameter HL, HRC, HRB, HV, HB, HS
Measuring Range/ metallic materials Table enclosed
Display Size 128 x 64mm LCD Screen
Display Functions Hardness Scale, Hardness Value, Times, Average Indicator, Average Value Impact direction, Type of Impact Device connected, Memory Reference, Date, Time, Battery Power consumption.
Accuracy Within 0.5% (HLD=800)
Statistics Average Value
Memory 1250 groups
Output RS 232 interface.
Impact Device Sold with type D as Standard
Optional Impact Devices DC/D+15G/C/E (see data sheet for Spec.)
Workpiece max. hardness value 940HV
Workpiece radius (convex/concave) Rmin=50mm (with support ring Rmin=10mm)
Workpiece minimum weight 2Kg on solid support (0.1kg with couplant paste)
Workpiece min. thickness coupled 3mm (except with impact device G:10mm)
Workpiece min. case hardened depth 0.8mm
Indentation depth see data sheet
Power 2 x AAA batteries 1.5V
Operating Temperature 5 to 50ºC (Impact device:120ºC max. briefly)
Overall Dimensions 108 x 62 x 25mm
Weight 180gr including impact device and printer

 

Standard Package Optional Accessories
Main Unit Special Impact
Devices
Impact Device Type UKAS certified Test Blocks in a
range of hardnesses.
Testblock HLD-value Support rings for convex-concave
surfaces.
2 AAA Batteries Mini-Printer and cable.
Cleaning Brush
Software and cable
Coupling Paste  
Certificate of Cal.  
Manual  

IMPACT DEVICES FOR SPECIAL APPLICATIONS TM#

Impact devices: D/DC/DL D+15 C G E
           
Impact Energy: 11Nmm 11Nmm 3Nmm 90Nmm 11Nmm
Mass of Impact body: 5.5g 7.8g 3.0g 20g 5.5g
  DL: 7.3        
Test Tip          
Hardness 1600HV 1600HV 1600HV 1600HV 5000HV
Diameter 3mm 3mm 3mm 5mm 3mm
Material   Tungsten carbide     Diamond
Impact Body          
Diameter 20mm 20mm 20mm 30mm 20mm
Length 147/86mm 162mm 141mm 254mm 155mm
Weight 75/50g 80g 75g 250g 80g
Max. Hardness of sample: 940HV 940HV 1000HV 650HB 1200HV
Preparation of surface;          
Roughness class ISO N7 N7 N5 N9 N7
Ax. Roughness depth Rt 10µm 10µm 2.5µm 30µm 10µm
Average roughness Ra 2µm 2µm 0.4µm 7µm 2µm
Min. Weight of sample          
Compact shape 5kg 5kg 1.5kg 15kg 5kg
On solid support 2kg 2kg 0.5kg 5kg 3kg
Coupled on plate 0.1kg 0.1kg 0.02kg 0.5kg 0.1kg
Min. Thickness of sample          
Coupled 3mm 3mm 1mm 10mm 3mm
Min thickness of hardened layers 0.8mm 0.8mm 0.2mm   0.8mm
Indentation of test tip
With 300 HV
          
Diameter 0.54mm 0.54mm 0.38mm 1.03mm 0.54mm
Depth 24µm 24µm 12µm 53µm 24µm
With 600HV          
Diameter 0.45mm 0.45mm 0.32mm 0.90mm 0.45mm
Depth 17µm 17µm 8µm 41µm 17µm
With 800HV          
Diameter 0.35mm 0.35mm 0.305mm   0.35mm
Depth 10µm 10µm 7µm   10µm

Materials versus range for impact device D (HLD 200-900)

MaterialHRCHRBHRAHB HVHS
Steel and Cast Steel 20-68 60-100 59-86 80-650 80-940 32-100
Cold work tool Steel 20-68       80-940  
Stainless Steel   46-100   80-650 80-800  
Grey Cast Iron       90-380    
Nodular Cast Iron       90-380    
Cast Aluminium alloys       20-160    
Brass   13-95   40-170    
Bronze       60-290    
Copper       45-315    

The ranges are stipulated by the application limits of the relevant static procedure

Download PDF Datasheet