---
title: What are guided radar sensors?
description: Principles of guided radar sensors
---

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# What are guided radar sensors?

## Principles of guided radar sensors

Guided radar sensors can be used for level measurement in liquids and solids.

The guided radar pulses along the probe ensure a precise and stable measurement even with dust and foam forming media.

High frequency microwave pulses are transmitted along a steel cable or a rod. When impinging on the product surface, the microwave pulses are reflected. The transmitted wave and its reflected time by the medium is evaluated by the device and output as a level value.

 

              ![](https://kb.innovatingautomation.asia/hs-fs/hubfs/image-png-Sep-20-2020-04-30-01-72-AM.png?width=397&name=image-png-Sep-20-2020-04-30-01-72-AM.png)

 

The evaluation of the sensor uses a 4-20mA HART-signal.  The start and end points of the  measuring length depends on the used medium.

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