Proceq Equotip 550 User Manual

12 © 2016 Proceq SA
3.3 Measuring Methods
Equotip 550 family of instruments is capable of accepting three diffrent
test methods using a single indicating unit.
3.3.1 Equotip Leeb
3.3.1.1 Test Principle
Release button
Loading tube
Impact Spring
Catch chuck
Guide tube
Connection cable – 4 pole
Sensor of impact device with
ID ROM
Support ring
Impact Body
Figure 10: Schematic View of a Leeb Impact Device
During measurement with Equotip 550 impact devices (D, DL, DC, C,
G, S, and E); an impact body with a ball indenter is launched by spring
energy against the sample to be measured, and then rebounds. Before
and after the impact, a permanent magnet inside the impact body passes
through a coil in which a voltage signal is induced by the forwards and
backwards movement. This induction signal behaves proportionally to
the velocities. The ratio of the rebound velocity v
r
to the impact velocity vi
multiplied by 1000 yields the hardness value HL (Leeb hardness). HL is a
direct measure of the hardness. The third resp. fourth letter of the HL unit
refers to the impact device HLD  D impact device.
v
r
v
i
·1000
HL =
Equotip Leeb U
Although the Equotip Leeb Impact Device U is constructed differently to
simplify the measurement process, the underlying principle is the same.
Figure 11: Equotip Leeb U Impact Device
Existing Parotester impact devices type U are fully supported by the
Equotip 550. Typ P and PG impact devices can be still used, but the unit
is shown as HLU although it would be actually LP resp. LPG.
NOTE! HLU values can be directly compared to LU on exist-
ing Parotester instruments.
Table of Contents


Proceq Equotip 550 Specifications

General

Brand	Proceq
Model	Equotip 550
Category	Test Equipment
Language	English