17
Selecting the probe type
The two probes are chosen to suit the pipe diameter.
The probe frequency has an important eect on measurement quality (see main measurement index).
The Minisonic can be used with a number of probe types which are adapted to the dierent pipe diameter ranges.
The table below sets out the average usage ranges for probes according to their frequencies.
Frequencies Pipe diameter
2 MHz 10 - 100 mm
1 MHz 40 - 1 000 mm
500 KHz 100 - 10 000 mm
Note: The values provided in the table correspond to the pipe inner (nominal) diameter.
Figure 13- Probes for portable
2 MHz 1 MHz 500 kHz
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