diff --git a/homeassistant/components/knx/sensor.py b/homeassistant/components/knx/sensor.py
index 20bbddf14a1..395b17e44a6 100644
--- a/homeassistant/components/knx/sensor.py
+++ b/homeassistant/components/knx/sensor.py
@@ -1,6 +1,7 @@
 """Support for KNX/IP sensors."""
 from __future__ import annotations
 
+from contextlib import suppress
 from typing import Any
 
 from xknx import XKNX
@@ -9,7 +10,7 @@ from xknx.devices import Sensor as XknxSensor
 from homeassistant import config_entries
 from homeassistant.components.sensor import (
     CONF_STATE_CLASS,
-    DEVICE_CLASSES,
+    SensorDeviceClass,
     SensorEntity,
 )
 from homeassistant.const import (
@@ -63,11 +64,10 @@ class KNXSensor(KnxEntity, SensorEntity):
         if device_class := config.get(CONF_DEVICE_CLASS):
             self._attr_device_class = device_class
         else:
-            self._attr_device_class = (
-                self._device.ha_device_class()
-                if self._device.ha_device_class() in DEVICE_CLASSES
-                else None
-            )
+            with suppress(ValueError):
+                self._attr_device_class = SensorDeviceClass(
+                    str(self._device.ha_device_class())
+                )
         self._attr_force_update = self._device.always_callback
         self._attr_entity_category = config.get(CONF_ENTITY_CATEGORY)
         self._attr_unique_id = str(self._device.sensor_value.group_address_state)