diff --git a/custom_components/sinapsi_alfa/sensor.py b/custom_components/sinapsi_alfa/sensor.py
index 1649501..1d23593 100644
--- a/custom_components/sinapsi_alfa/sensor.py
+++ b/custom_components/sinapsi_alfa/sensor.py
@@ -4,6 +4,7 @@
 """
 
 import logging
+import re
 from typing import Any
 
 from homeassistant.components.sensor import SensorEntity
@@ -52,6 +53,19 @@ async def async_setup_entry(hass: HomeAssistant, config_entry, async_add_entitie
     return True
 
 
+def to_unique_id(raw: str):
+    """Convert string to unique_id."""
+    string = (
+        re.sub(r"(?<=[a-z0-9:_])(?=[A-Z])|[^a-zA-Z0-9:_]", " ", raw)
+        .strip()
+        .replace(" ", "_")
+    )
+    result = "".join(string.lower())
+    while "__" in result:
+        result = result.replace("__", "_")
+    return result
+
+
 class SinapsiAlfaSensor(CoordinatorEntity, SensorEntity):
     """Representation of a Sinapsi Alfa sensor."""
 
@@ -141,7 +155,7 @@ def should_poll(self) -> bool:
     @property
     def unique_id(self):
         """Return a unique ID to use for this entity."""
-        return f"{DOMAIN}_{self._device_sn}_{self._key}"
+        return to_unique_id(f"{self._device_sn}_{self._key}")
 
     @property
     def device_info(self):