GE DMS Go+ - Important Information on Wall Thickness Measurement Using the DMS Go; Probe Zero Offset; Measuring Accuracy

1 Introduction Important information on wall thickness measurement using the DMS Go+
1-8 Edition 4 (05/2014) DMS Go+
1.3 Important information on wall
thickness measurement
using the DMS Go+
ATTENTION
Please always read the following information
about the special features in wall thickness
measurement using the DMS Go+. It is abso
-
lutely necessary that you observe this infor-
mation in order to always obtain correct
measurement results.
Probe zero offset
High differences in temperature
If the differences in temperature between the storage
and inspection site are high, it is necessary that you wait
approx. 2 minutes before you use the instrument after
connecting the probe.
Temperatures below –10 °C
The probe zero offset does not always function correctly
at temperatures below –10 °C. You should therefore
carry out a 2-point calibration and repeat it in the case
of major temperature jumps.
Couplant residues
In order to ensure a correct probe zero offset, make sure
that you always remove the couplant residues before
carrying out a new measurement after decoupling the
probe.
Measuring accuracy
Keep in mind that the measuring accuracy is not identi-
cal with the display accuracy.
The measuring accuracy depends on the following fac-
tors:
● Temperature
● Probe delay line
● Constancy of sound velocity
● Uniformity of surface quality