---
title: FLT (Temperature limiter floor sensor)
description: "![](https://faqdoc.info/wp-content/uploads/2026/01/Matrix_55__icon_Elektro-Wasser.png) Depending on the desired maximum floor temperature, this can be selected between 25°C and 60°C (77°F and 140°F). The resulting surface temperature will naturally vary depending on the positioning of the floor sensor and the floor structure. Prerequisite for…"
url: "https://faqdoc.info/en/systemauswahl/alpha-direct-en/alpha-direct-thermostat-55-matrix/flt/"
updated: "2026-09-30"
category: Alpha direct thermostat 55 Matrix
---

# FLT (Temperature limiter floor sensor)

![](https://faqdoc.info/wp-content/uploads/2026/01/Matrix_55__icon_Elektro-Wasser.png)

Depending on the desired maximum floor temperature, this can be selected between 25°C and 60°C (77°F and 140°F). The resulting surface temperature will naturally vary depending on the positioning of the floor sensor and the floor structure.

Prerequisite for use:

- floor sensor must be connected
- be set in sensor mode (**SMO**): **F**, **AF**, **A2F**

**ATTENTION**
**The EF 20201-N cannot be used as a temperature limiter in combination with electric underfloor heating systems!**

**→ See the applicable standards for electric panel heating elements:**

- **DIN EN 60335-1**
- **DIN EN 60335-2-96**