diff --git a/sensospot_data/__init__.py b/sensospot_data/__init__.py
index 53db413..83d87a6 100644
--- a/sensospot_data/__init__.py
+++ b/sensospot_data/__init__.py
@@ -3,7 +3,7 @@
 Parsing the numerical output from Sensovations Sensospot image analysis.
 """
 
-__version__ = "0.5.1"
+__version__ = "0.5.2"
 
 
 from pathlib import Path
diff --git a/sensospot_data/dynamic_range.py b/sensospot_data/dynamic_range.py
index c41e9e4..790288f 100644
--- a/sensospot_data/dynamic_range.py
+++ b/sensospot_data/dynamic_range.py
@@ -69,12 +69,14 @@ def normalize_values(data_frame, normalized_time=None):
     """add exposure time normalized values to a data frame
 
     will use the maximum exposure time, if none is provided
+    and the column SETTINGS_NORMALIZED_EXPOSURE_TIME was not
+    set before.
     """
-    if normalized_time is None:
+    if normalized_time:
+        data_frame[SETTINGS_NORMALIZED_EXPOSURE_TIME] = normalized_time
+    elif SETTINGS_NORMALIZED_EXPOSURE_TIME not in data_frame.columns:
         normalized_time = data_frame[SETTINGS_EXPOSURE_TIME].max()
-    print(normalized_time)
-
-    data_frame[SETTINGS_NORMALIZED_EXPOSURE_TIME] = normalized_time
+        data_frame[SETTINGS_NORMALIZED_EXPOSURE_TIME] = normalized_time
 
     for original_col, normalized_col in RAW_DATA_NORMALIZATION_MAP.items():
         data_frame[normalized_col] = (
diff --git a/tests/test_dynamic_range.py b/tests/test_dynamic_range.py
index ade94f7..22e58fc 100644
--- a/tests/test_dynamic_range.py
+++ b/tests/test_dynamic_range.py
@@ -213,6 +213,29 @@ def test_normalize_values_custom_param(normalization_data_frame):
         assert list(sorted_results[normalized_col]) == expected_values
 
 
+def test_normalize_values_preset_param(normalization_data_frame):
+    from sensospot_data.columns import (
+        RAW_DATA_NORMALIZATION_MAP,
+        SETTINGS_NORMALIZED_EXPOSURE_TIME,
+    )
+    from sensospot_data.dynamic_range import (
+        PROBE_MULTI_INDEX,
+        blend,
+        normalize_values,
+    )
+
+    reduced = blend(normalization_data_frame, "Saturation", 1)
+    reduced[SETTINGS_NORMALIZED_EXPOSURE_TIME] = 100
+
+    result = normalize_values(reduced)
+
+    sorted_results = result.sort_values(by=PROBE_MULTI_INDEX)
+    expected_values = [2, 8, 30, 2, 20, 20, 20, 20, 200, 200, 200, 200]
+
+    for normalized_col in RAW_DATA_NORMALIZATION_MAP.values():
+        assert list(sorted_results[normalized_col]) == expected_values
+
+
 def test_create_xdr(normalization_data_frame):
     from sensospot_data.columns import RAW_DATA_NORMALIZATION_MAP
     from sensospot_data.dynamic_range import PROBE_MULTI_INDEX, create_xdr