7
5.1.2Method of Precision Measurement
This method involves increasing the number of measurement spots around a certain measurement point and
expressing the thickness fluctuation in terms of isothickness contour lines, fig.3.
Fig. 3
Fig 3.
5.1.3Method of continuous measurements
Fig.4
As in fig.4, this method involves taking continuous measurements along a specified line according to the single
measurement method, at intervals of 5mm or less.
Your application will dictate which is the most effective method to use. If unsure of best method, the double
measurement method should be employed in combination with one of other methods. Taking into account the
corrosion condition of the material
5.2 Methods for measuring pipe walls
The thickness of a pipe or round object can be measured accurately with this instrument. The measurement range
is shown in Table
5.1
．
Table5.1
Probe
type
Pipe diameter inch
(mm)
Thickness Inch (mm)
Pt-08,10 and 12
≥φ
1.0” (25mm)
≥ 0.04”(
1.2mm)
Fig.5 5 Pipe sample
IMPORTANT! the Split-plane of the probe may be along the pipe axis or perpendicular to it as shown in Fig.5.For
small pipes, measurement should be made in both directions (moving probe a little bit ),the smaller displaying
value should be taken as the thickness value.
For large pipes, measure the thickness of the wall along the direction
perpendicular
to the pipe axis, fig.6and 7.
