Delayline probes are used to avoid interference with the transmitter pulse during manual wall thickness measurement. Three types of probes in the frequency range from 2 to 20 MHz are the standard choice for the ECHOMETER.

For special applications such as the measurement of multi-layer plastic tanks or composite components made of GRP and CFRP, broadband probes with high sensitivity and good resolution are required. For this task, a highly damped 2 MHz straight-beam probe with Ø 10 mm composite was developed (left image). The exchangeable delay line made of a high-performance plastic with good sound conductivity has a contact surface diameter of only 16 mm and a length of 20 mm. This results in an enlarged thickness range for measuring these components. A high-frequency probe is necessary for measuring the thickness of thin metal layers. Thus, a 20 MHz crystal with Ø 4 mm was built into a special housing, allowing the use of a delay line of only 6 mm diameter. Handling is just as easy as with the standard probe, as the housing is of convenient size. At the same time, the resolution has been significantly improved when operating with the ECHOMETER 1077 wall thickness gauge.