diff --git a/phoenix_bec/devices/unsupported_legacy/psi_detector_base.py b/phoenix_bec/devices/unsupported_legacy/psi_detector_base.py
index 8226c35..1f76a4d 100644
--- a/phoenix_bec/devices/unsupported_legacy/psi_detector_base.py
+++ b/phoenix_bec/devices/unsupported_legacy/psi_detector_base.py
@@ -10,6 +10,8 @@ import time
 import traceback
 from typing import Generic, TypeVar
 
+from ophyd import Component as Cpt
+from ophyd_devices.sim.sim_signals import SetableSignal
 from bec_lib.file_utils import FileWriter
 from bec_lib.logger import bec_logger
 from ophyd import Device, DeviceStatus, Kind
@@ -23,14 +25,13 @@ from ophyd_devices.utils.errors import DeviceStopError, DeviceTimeoutError
 
 logger = bec_logger.logger
 
-T = TypeVar("T", bound="BECDeviceBase")
 
 
 class BECDeviceBaseError(Exception):
     """Error class for BECDeviceBase."""
 
 
-class CustomPrepare(Generic[T]):
+class CustomDetectorMixin:
     """Custom prepare class for beamline specific logic.
 
     This class provides a set of hooks for beamline specific logic to be implemented.
@@ -316,7 +317,7 @@ class CustomPrepare(Generic[T]):
         return status
 
 
-class BECDeviceBase(Device):
+class PSIDetectorBase(Device):
     """
     Base class for custom device integrations at PSI. This class wraps around the ophyd's standard
     set of methods, providing hooks for custom logic to be implemented in the custom_prepare_cls.
@@ -325,7 +326,9 @@ class BECDeviceBase(Device):
     (https://bec.readthedocs.io/en/latest/) for more information about device integration.
     """
 
-    custom_prepare_cls = CustomPrepare
+    custom_prepare_cls = CustomDetectorMixin
+
+    filepath = Cpt(SetableSignal, value="", kind=Kind.config)
 
     # All possible subscription types that the Device Manager subscribes to
     # Run the command _run_subs(sub_type=self.SUB_VALUE, value=value) to trigger