Krautkramer DM4E / DM4 / DM4 DL Issue 05, 01/01 11-3
Application information Appendix
Curved surfaces
Couple the probe to
the center of the test
surface for radial
beaming when mea-
suring curved convex
surfaces, e.g. tubes or
cylindrical containers.
The probe’s acoustic
separation layer must
be vertical to the longi-
tudinal axis of the test
object (see figure). Probes with smaller contact face
diameters generally enable better coupling to curved
convex surfaces.
Thickness measurement on hot test objects
The DM4 DL can be used for thickness measurements
on materials which have a surface temperature of up
to 600°C when equipped with a special high-tempera-
ture probe (e.g. DA 305). A couplant especially devel-
oped for such applications, ZGM, is also required.
It is recommended to proceed as follows:
Calibrate the DM4 DL as described in Chapter 5.
Clean the surface of the test object thoroughly with a
wire brush and, if necessary, remove any oxidized
layers.
Knead the high-temperature couplant ZGM in the tube
before using. Then apply a small drop of ZGM (about 5
mm in diameter) onto the contact surface of the probe,
but not to the test object.
Couple the probe carefully onto the surface of the test
object. In order to avoid damages to the probe surface,
do not turn the probe whilst it is in contact with the
surface of the test object. With curved surfaces, it should
be ensured that the acoustic separartion layer of the
probe is aligned as described in Chapter 4.8 Handling
the probe. In order to achieve good coupling, let the
couplant ZGM melt for 2 or 3 seconds. With tempera-
Krautkramer DM4E / DM4 / DM4 DL Issue 05, 01/01 11-3
Application information Appendix
Curved surfaces
Couple the probe to
the center of the test
surface for radial
beaming when mea-
suring curved convex
surfaces, e.g. tubes or
cylindrical containers.
The probe’s acoustic
separation layer must
be vertical to the longi-
tudinal axis of the test
object (see figure). Probes with smaller contact face
diameters generally enable better coupling to curved
convex surfaces.
Thickness measurement on hot test objects
The DM4 DL can be used for thickness measurements
on materials which have a surface temperature of up
to 600°C when equipped with a special high-tempera-
ture probe (e.g. DA 305). A couplant especially devel-
oped for such applications, ZGM, is also required.
It is recommended to proceed as follows:
Calibrate the DM4 DL as described in Chapter 5.
Clean the surface of the test object thoroughly with a
wire brush and, if necessary, remove any oxidized
layers.
Knead the high-temperature couplant ZGM in the tube
before using. Then apply a small drop of ZGM (about 5
mm in diameter) onto the contact surface of the probe,
but not to the test object.
Couple the probe carefully onto the surface of the test
object. In order to avoid damages to the probe surface,
do not turn the probe whilst it is in contact with the
surface of the test object. With curved surfaces, it should
be ensured that the acoustic separartion layer of the
probe is aligned as described in Chapter 4.8 Handling
the probe. In order to achieve good coupling, let the
couplant ZGM melt for 2 or 3 seconds. With tempera-
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