LD 250 and 750

Automatic Universal hardness Testers

The LD250 and LD750 universal hardness testers encompass all standard hardness testing methods, including Rockwell, Superficial Rockwell, Brinell, Brinell HBT, and Vickers. These testers provide accurate hardness measurements for all metals and alloys, fully compliant with ASTM and DIN EN ISO international standards.

Test Loads LD250: From 1 to 250 kgf (9,807 to 2452 N)
Test Loads LD750: From 3 to 3000 kgf (29.4 to 29421 N)
Rockwell ISO 6508 / ASTM E-18: HRA – HRB – HRC – HRD – HRF – HRG – HRL – HRM – HRR / HRN – HRT – HRS – HRW – HRX – HRY
Brinell HBW ISO 6506 / ASTM E-10 HBW1/30 – HBW2.5/15.625 – HBW2.5/31.25 – HBW2.5/62.5 – HBW2.5/187.5 – HBW5/25 – HRW5/62,5 – HBW5/125 – HBW5/250 – HBW5/750 – HBW10/100 – HBW10/250 – HBW10/500 – HBW10/1000 – HBW10/1500 – HBW10/3000
Brinell HBWT ASTM E103 HBWT2.5/62.5 – HBWT2.5/187.5 – HBWT5/125 – HBWT5/250 – HBWT5/750 – HBWT10/500 – HBWT10/1000 – HBWT10/1500 – HBWT10/3000
Vickers ISO 6507 / ASTM E-384 / ASTM E-92 HV1 – HV2 – HV3 – HV5 – HV10 – HV20 – HV30 – HV50 – HV100

One Touch Measuremet

LD 250 and 750 universal hardness testers are a fully motorized system designed for automatic sample loading and optical measurement via camera. AFFRI System hardness testers provide the highest precision in load application and measurement resolution, setting a new standard in hardness testing. With the AFFRI System, real indentation measurements are ensured, free from external interference, under all conditions.

How to do a hardness measurement?

The hardness measurements are very easy, quick and absolute. The hardness test cycle is fully automatic and motorized in just one drive (button or icon):

Automatic contact with the specimen
Auto-active sliding clamping
Automatic preloading and loading
Auto-switching to optic lens
Autofocus by image scanning brightness
Auto measure and result display
Automatic return stroke at programmed distance

Specimen Auto-contact from any Distance

The fully motorized, adjustable testing stand provides a vertical capacity with automatic surface contact and clamping from any distance, initiated by a single input. The test cycle is automatically triggered when the head makes contact with the specimen, which is instantly recognized at any point within the vertical stroke. This system ensures smooth, precise testing, eliminating the need for manual adjustments, and offering enhanced efficiency for testing a wide range of materials and sample sizes. The automation improves consistency and accuracy throughout the entire testing process.

Our universal hardness tester is a durable, reliable system built for tough environments, capable of handling heavy, bulky samples with a forklift or overhead crane.

Auto-compensation of All Deflections

When testing unstable or deflecting samples, the AFFRI System ensures continuous contact with the specimen, thanks to its infinite stroke capability for both the indenter and clamping hood. This allows the system to track the sample without interruption.

The Closed Loop Control

Load forces are applied via load cells and regulated in a Closed-Loop system with a frequency of 1 kHz, ensuring perfect linearity across all ranges. Structural deflections, misalignments, or vibrations do not affect the results. Precise measurements are achieved on the first test, even under challenging conditions, eliminating the need for repeated trials. The system’s R&R (Repeatability and Reproducibility) data is among the best in its class.

The EXCLUSIVE MILLING TOOL

LD 250 and 750 hardness testers can be fitted with a sample preparation system that is directly mounted on the instrument’s head.

Software

The universal hardness testers LD 250 and 750 are equipped with a pre-installed software that controls the whole instrument during the entire cycle avoiding operator errors.

Touchscreen 15″
User-friendly software
Color highlighted results (low/ok/high)
Live statistics and graph
Programs of test settings
Results archives
Save images
Export results to PDF, TXT, CSV, DOC, XLS, and more
Data enter via bar-code scanning
Outputs via RS232, USB, and Ethernet
Data exchange with management system MES

MAIN FEATURES

MOTORIZED TURRET

The automatic two-position turret features one indenter and one objective, both of which can be easily swapped using manual screwing. It offers auto-rotation, auto-tool switching, and auto-centering for a fully automated hardness testing cycle. (An 8-position turret is available upon request.)

MAIN FEATURES

CLAMPING SYSTEM

A secure connection with the specimen is guaranteed throughout the test, even in the rare case of specimen movement during the testing cycle. The clamping system ensures full stability of the test piece, regardless of its condition whether oiled, rusted, or contaminated with dirt throughout the entire testing process.

MAIN FEATURES

HARD BASE

The spacious worktable base is designed to support loads exceeding 3000 kg, along with specialized fixtures or anvils. It allows for hardness testing of large or irregularly shaped specimens that may not be easily accommodated by standard bench hardness testers.

AUTOFOCUS

The automatic focus adjustment system for each optic ensures precise positioning at any magnification, utilizing real image brightness scanning with continuous steps for infinite accuracy. This technology guarantees high reading standards, reproducible focus values, and reduces reading time. Hardness measurements remain objective, unaffected by subjectivity.

CAMERA AUTO-READING

The software automatically measures indentations on any sample surface, ranging from perfectly polished to rough or etched materials. It features automatic light regulation for dark, opaque, or polished samples, adjusting both light and contrast to optimize visibility and ensure accurate indentation measurements.

PROTECTED DIAMOND INDENTER

All Affri diamond indenters are designed for extended longevity, thanks to a specialized protective cup. This cup retracts and lowers immediately after the test piece is secured, effectively minimizing the risk of accidental impact.