A-HFRR

Test procedure
The A-HFRR (High Frequency Reciprocating Rig) is based on devices that have been used for many years in the Tribology (Friction and Lubrication) Department of the Faculty of Engineering at Imperial College London. Systems of this type are used to determine the lubricity of a sample during slow cyclic sliding. The A-HFRR system has proven particularly useful in assessing the lubricity of diesel fuels. The A-HFRR system uses an electromagnetic motor to provide low-amplitude oscillations of a moving specimen pressed against a stationary specimen. The amplitude and frequency of these vibrations can be changed. In this case, the friction force between the samples and the voltage drop at the point of contact between them are measured. The lower, fixed specimen is secured in a small tray containing the lubricant to be tested. The lower specimen holder is equipped with an electric heater. Testing specimen of various shapes is possible. The reference materials for testing diesel fuels are a 6 mm ball for the upper specimen and a 10 mm disc for the lower specimen.

When using the A-HFRR, you have two main reasons to be sure of the test results you get:
Our rig outperforms leading devices in both repeatability and reproducibility, while also having a better mechanical design. The temperature and humidity in the climate chamber are fully controlled by the device, thus the risk of human error is mitigated.

The advantages of the A-HFRR system
Best repeatability and reproducibility of measurement results; The possibility of assessing the wear spot of standard samples using only one measurement; A very small amount of lubricant is sufficient, so testing of experimental lubricating fluids is possible; The ability to observe the formation of a thin film because of surface additives through the change in voltage at the point of contact; The ability to measure sliding friction at large amplitudes of specimen movement, as well as wear due to friction using the same system.

A-HFRR = Monoblock: control unit, climate chamber, test module, air preparation unit, computer, storage chamber for balls-plates in a single case
We know that many laboratories have problems with space, so we tried to make the instrument compact. The device has relatively small dimensions and weight, so it can be easily placed on a regular table.