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Digital Rockwell and Superficial Rockwell Twin Hardness Tester RH-520
· Horizontal Protrudent Indenter Design, suitable also for internal and external testing.
· Testing on Surfaces difficult to reach. Testing internal surface of rings and tubes with diameters over 23mm.
· Modern design with Titanium metallic Silver finish
· Provided with many features such as high measuring precision, wide measuring range
· The tester is suitable for testing of carbon steel, alloy steel, cast iron, non ferrous metal.
· Automatic load cycle. The loading, dwell, unloading process of the main test force are controlled exactly to meet standard.
· Measuring results digitally displaying and can be printed, or transmitted to external computer automatically by USB or RS-232 data output port.
· Test value can be transformed to the value of HB, HV, HK and σb value.
· The tester meeting all the international standard such as ISO 6508-2, ASTM E18.

| Model no. | RH-500 | RH-510 | RH-520 |
| Preload | 98.1N (10kgf) | 29.4N (3kgf) | 29.4N (3 kgf) |
| Total test force | 588.4N (60kgf), | 147.1N(15kgf), 294.3N(30kgf), 441.3N(45kgf) | 147.1N(15kgf), 294.3N(30kgf), 441.3N(45kgf), |
| Scales | HRA,HRB,HRC, | HR15N, HR30N, HR45N, HR15T, HR30T, HR45T, HR15W, HR30W, HR45W, HR15X, HR30X, HR45X, HR15Y, HR30Y, HR45Y | HR15N, HR30N, |
| Load dwell duration | 2~50s, can be set and stored | ||
| Resolution | 0.1HR | ||
| Display | High definition backlight LCD | ||
| Operation | Menu selectable, Membrane keypad | ||
| Upper/lower limits setting & alarming | √ | √ | √ |
| Data statistics | Avg., Max., Min., S, R available | ||
| Curved surface correcting automatically | √ | √ | √ |
| Memory | Max 500 items of test results stored automatically | ||
| Data output | RS-232 to micro printer, USB port to external PC | ||
| Testing space | 240mm in vertical, 155mm in horizontal | ||
| Dimensions | 720mm×220mm×800mm | ||
| Power supply | AC, 220V/110V, 50~60Hz, 4A | ||
| Net weight | 120kg | 110kg | 130kg |

Standard accessories:
RH-500 | RH-510 | RH-520 | |
| Host Machine | √ | √ | √ |
| Standard hardness block for A scale | √ | √ | |
| Standard hardness block for B scale | √ | √ | |
| Standard hardness block for C scale | √ | √ | |
| Standard hardness block for 30N scale | √ | √ | |
| Standard hardness block for 30T scale | √ | √ | |
| Ball indenter (1/16”) | √ | √ | √ |
| 120°cone diamond indenter | √ | √ | √ |
| Mounting screws for indenter ×2 | √ | √ | √ |
| Round plane anvil | √ | √ | √ |
| “V” Shape anvil | √ | √ | √ |
| Power supply wire | √ | √ | √ |
| Screwdriver for indenter mounting | √ | √ | √ |
| Dust cover | √ | √ | √ |
Optional accessories:
| Short diamond indenter |
| Chisel diamond indenter |
| Slender diamond indenter |
| 1/8” ball indenter and spare steel ball |
| 1/4” ball indenter and spare steel ball |
| 1/2” ball indenter and spare steel ball |
| φ225 anvil |
| φ150 anvil |
| Standard hardness block for other scales |
| Micro printer |
