Krautkramer DM4E / DM4 / DM4 DL Issue 05, 01/01 1-11
Important notes on thickness testing with the DM4 Introduction
Doubling of measurement readings
A dangerous measurement error occurs when a thick-
ness measurement is carried out whilst below the
specified application range (operation range) for the
probe being used. In this case, the first backwall echo
is too small for an evaluation but the second backwall
echo has a sufficient amplitude height and is therefore
evaluated by the instrument. This results in the dis-
played thickness reading being double that of the real
thickness value. In order to avoid such an error, the
operator must additionally carry out a test measure-
ment with another probe when measuring on the limit
of the application range.
In critical cases, a test measurement with a screen
instrument is recommended because the echo shape
can give important additional information when
viewed.
1.5 Important notes on thickness
testing with the DM4
A Attention:
In the following you will find most important test
requirements that you always have to comply with to
ensure correct measurements with the DM4.
Probe Zero Adjustment
High temperature changes
If there are high differences of the ambient tempera-
ture between storage and test place it is necessary to
wait approx. 2 minutes after connecting the probe be-
fore carrying out any measurement.
Temperatures below -10 °C
Probe Zero Adjustment with ambient temperatures
< -10° C is not always correct. To ensure correct mea-
surements carry out 2-point-calibration and repeat it in
the case of high temperature changes.
For 2-point-calibration please refer to page 5-7.
Krautkramer DM4E / DM4 / DM4 DL Issue 05, 01/01 1-11
Important notes on thickness testing with the DM4 Introduction
Doubling of measurement readings
A dangerous measurement error occurs when a thick-
ness measurement is carried out whilst below the
specified application range (operation range) for the
probe being used. In this case, the first backwall echo
is too small for an evaluation but the second backwall
echo has a sufficient amplitude height and is therefore
evaluated by the instrument. This results in the dis-
played thickness reading being double that of the real
thickness value. In order to avoid such an error, the
operator must additionally carry out a test measure-
ment with another probe when measuring on the limit
of the application range.
In critical cases, a test measurement with a screen
instrument is recommended because the echo shape
can give important additional information when
viewed.
1.5 Important notes on thickness
testing with the DM4
A Attention:
In the following you will find most important test
requirements that you always have to comply with to
ensure correct measurements with the DM4.
Probe Zero Adjustment
High temperature changes
If there are high differences of the ambient tempera-
ture between storage and test place it is necessary to
wait approx. 2 minutes after connecting the probe be-
fore carrying out any measurement.
Temperatures below -10 °C
Probe Zero Adjustment with ambient temperatures
< -10° C is not always correct. To ensure correct mea-
surements carry out 2-point-calibration and repeat it in
the case of high temperature changes.
For 2-point-calibration please refer to page 5-7.
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