> For the complete documentation index, see [llms.txt](https://docs.lorric.com/qr/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lorric.com/qr/fu-tx310-ultrasonic-flowmeter-manual-en-v2/2-installation-method/2.2-ultrasonic-probe.md).

# 2.2 Ultrasonic probe

The instrument sends an ultrasonic signal. The transmission and reception of the signal through the pipe wall and interior fluid are performed through a piezoelectric ultrasonic probe and then transmitted through the ultrasonic signal. The resulting time differential is used to measure the flow. The distance between probes must be precisely calculated and the probes must be correctly placed to ensure measurement accuracy. This section describes the relevant wiring and installation precautions.


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