diff --git a/scos_actions/hardware/mocks/mock_sigan.py b/scos_actions/hardware/mocks/mock_sigan.py
index 1876851b..8367bf0d 100644
--- a/scos_actions/hardware/mocks/mock_sigan.py
+++ b/scos_actions/hardware/mocks/mock_sigan.py
@@ -30,6 +30,7 @@ def __init__(
         self,
         sensor_cal: Optional[Calibration] = None,
         sigan_cal: Optional[Calibration] = None,
+        switches: Optional[dict] = None,
         randomize_values: bool = False,
     ):
         super().__init__(sensor_cal, sigan_cal)
diff --git a/scos_actions/hardware/sensor.py b/scos_actions/hardware/sensor.py
index 74cbf479..c4120a33 100644
--- a/scos_actions/hardware/sensor.py
+++ b/scos_actions/hardware/sensor.py
@@ -1,6 +1,6 @@
+import datetime
 import hashlib
 import json
-import datetime
 from typing import Dict
 
 from its_preselector.preselector import Preselector
@@ -14,7 +14,7 @@
 class Sensor:
     def __init__(
         self,
-        signal_analyzer: SignalAnalyzerInterface = MockSignalAnalyzer,
+        signal_analyzer: SignalAnalyzerInterface = None,
         gps: GPSInterface = None,
         preselector: Preselector = None,
         switches: Dict[str, WebRelay] = {},