diff --git a/csst_common/data_manager.py b/csst_common/data_manager.py
index 9938a62b39c9eeb96ec4207e88886f8f9f177186..886425495281d6e1cbfd0137e02bff48cf707076 100644
--- a/csst_common/data_manager.py
+++ b/csst_common/data_manager.py
@@ -147,6 +147,9 @@ class CsstMsDataManager:
             self.available_detectors = [int(re.split(r"[_.]", fp)[7]) for fp in fps_img]
             self.available_detectors.sort()
 
+        # set all available detectors by default
+        self.set_detectors(None)
+
     @staticmethod
     def glob_image(dir_l0, ver_sim="C5"):
         """ glob files in L0 data directory """