Product Description - Proceq DIGI-SCHMIDT 2000 ND Operating Instructions Manual

2

Product Description

Fig. 2.1 Display unit with concrete test hammer
(Model ND/LD)
The DIGI-SCHMIDT 2000 concrete test hammer compri-
ses the actual concrete test hammer and the display unit.
Both components belong together and are calibrated as
one unit.
The impact bolt of the concrete test hammer strikes the
surface of the concrete with a defined force. After the
impact, a metal body, the so-called hammer (see pos. 14
in Fig. 6.2, page 16), rebounds. The rebound distance is
measured by a sensor and passed on to the display unit
as an electrical signal. The signal converted by the elec-
tronics is shown on the display unit as rebound value R
and, if necessary, displayed together with the correspon-
ding compressive strength of the concrete, fck.
4 Product Description
Display unit
Concrete test hammer
Test hammer cable
There is a specific relationship between the rebound
value R and the hardness and strength of the concrete.
The following factors must be taken into account when
ascertaining rebound values R:
- Impact direction: horizontal, vertically upwards or
downwards
- Age of the concrete
- Size and shape of the comparison sample (cube,
cylinder)
Model ND can be used for testing:
- Concrete items 100 mm or more in thickness
- Concrete with a maximum particle size < 32 mm
Model LD can be used for testing:
- Items with small dimensions (e.g. thin-walled items
with a thickness from 50 to 100 mm)
With Model LD, it may be necessary to clamp
the items to be tested prior to measurement in
order to prevent the material from deflecting.
- Items made from artificial stone which are sensitive to
impacts
For Technical Data, see page 18
© 2001 PROCEQ SA