> 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-lt-english-v1/measurement-principle-and-design-applications.md).

# Measurement Principle and Design Applications

This product incorporates technologies protected by multiple international patents.

<figure><img src="/files/lRnMGCr7ZUbX6G95nMKI" alt=""><figcaption></figcaption></figure>

The LORRIC clamp-on ultrasonic flowmeter uses the **Time of Flight (ToF)** principle, measuring the travel time difference of ultrasonic waves upstream and downstream to calculate flow rate.

Its **integrated clamp-on design** allows installation **without system shutdown**, avoids pipe damage, and provides **excellent chemical resistance and leak protection**. Unlike conventional clamp-on meters, **no probe distance calibration is required**, reducing installation time and training requirements.

Due to pipeline dimensional tolerances, the system may show **small flow readings even when no fluid is moving**. This is normal and caused by physical measurement characteristics.

{% hint style="info" %}
Avoid fluids with large amounts of solids, bubbles, crystals, or sediment, which may interfere with ultrasonic measurement.

Install the unit away from strong magnetic fields or electromagnetic interference.

Ensure the fluid is in **fully developed flow** for accurate measurement. Follow installation guidelines for proper placement.
{% endhint %}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.lorric.com/qr/fu-lt-english-v1/measurement-principle-and-design-applications.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.