diff --git a/script/test/20220201/MultiRegionScan.py b/script/test/20220201/MultiRegionScan.py
index 5730ded2..ab0a56c8 100644
--- a/script/test/20220201/MultiRegionScan.py
+++ b/script/test/20220201/MultiRegionScan.py
@@ -100,6 +100,11 @@ def check_region(region):
         print("region {0}: setting default cis = {1}".format(region['name'], region['cis']))
         
 class SpectrumReader(ReadonlyRegisterBase, ReadonlyRegisterArray):
+    """
+    pseudo-device class to acquire and read out a Scienta spectrum per region.
+
+    this devices starts the spectrum acquisition and organises the data file.
+    """
     def initialize(self):
         #super(SpectrumReader, self).initialize()
         self.scan_index = -1
@@ -136,8 +141,6 @@ class SpectrumReader(ReadonlyRegisterBase, ReadonlyRegisterArray):
         if self.scan_index != get_exec_pars().index:
             self.scan_index = get_exec_pars().index
             self.create_datasets()
-            if self.region_index == 0:
-                print "scan {0}".format(self.scan_index)
 
         print "scan {0}, region {1}".format(self.scan_index, self.region_index)
         
@@ -195,11 +198,6 @@ class SpectrumReader(ReadonlyRegisterBase, ReadonlyRegisterArray):
             
         Scienta.update()
 
-    def read_scales(self):
-        # print("spectrum.read_scales")
-        append_dataset(self.channel_begin_dataset_name, Scienta.getChannelBegin().getValue()) # ???
-        append_dataset(self.channel_end_dataset_name, Scienta.getChannelEnd().getValue()) # ???
-        
     def read(self):
         # print("spectrum.read")
         global current_region_index
@@ -209,7 +207,8 @@ class SpectrumReader(ReadonlyRegisterBase, ReadonlyRegisterArray):
         trig_scienta()
         time.sleep(0.1)
         sp = Scienta.getSpectrum().read()
-        self.read_scales()
+        append_dataset(self.channel_begin_dataset_name, Scienta.getChannelBegin().getValue())
+        append_dataset(self.channel_end_dataset_name, Scienta.getChannelEnd().getValue())
         return sp
 
     def getSize(self):
@@ -222,7 +221,12 @@ class SpectrumReader(ReadonlyRegisterBase, ReadonlyRegisterArray):
         return nx
 
 
-class ImageReader(ReadonlyRegisterBase, ReadonlyRegisterMatrix):   
+class ImageReader(ReadonlyRegisterBase, ReadonlyRegisterMatrix):
+    """
+    pseudo-device class to read out the Scienta image per region.
+
+    this device just reads out the Scienta image that has been acquired by SpectrumReader.
+    """
     def read(self):
         # print("image.read")
         return Scienta.getDataMatrix().read()
@@ -241,6 +245,15 @@ class ImageReader(ReadonlyRegisterBase, ReadonlyRegisterMatrix):
         ny = Scienta.slices.read()
         return ny
 
+class SimpleDeviceReader(Readable):
+    """
+    pseudo-device class to read out another device once per region.
+
+    the device must be set assigned to the device attribute.
+    """
+    def read(self):
+        return device.read()
+
 def setup_live_plots(regions):
     global live_plots
     global current_region_index
@@ -265,6 +278,13 @@ def update_live_plots():
         print "Stopping live spectra"
 
 def do_scan(scan, motors, positions, regions, latency):
+    """
+    set up detectors and run the scan
+
+    for each region we have to add a SpectrumReader and an ImageReader pseudo-device to the SENSORS list.
+    the order SpectrumReader, ImageReader is important because the SpectrumReader triggers the Scienta,
+    whereafter the ImageReader reads the image.
+    """
     global SENSORS
     
     SENSORS = []
@@ -277,18 +297,28 @@ def do_scan(scan, motors, positions, regions, latency):
         reader.region_name = "region{0}".format(index + 1)
         reader.region = region
         reader.initialize()
-        set_device_alias(reader, reader.region_name + "/ScientaSpectrum")
+        reader.set_alias(reader.region_name + "/ScientaSpectrum")
         SENSORS.append(reader)
 
         image = ImageReader()
         image.region_index = index
         image.region = region
         image.initialize()
-        set_device_alias(image, reader.region_name + "/ScientaImage")
+        image.set_alias(reader.region_name + "/ScientaImage")
         SENSORS.append(image)
 
-    SENSORS.append(SampleCurrent)
-    SENSORS.append(RefCurrent)
+        dev = SimpleDeviceReader()
+        dev.device = SampleCurrent
+        dev.set_alias(reader.region_name + "/SampleCurrent")
+        SENSORS.append(dev)
+
+        dev = SimpleDeviceReader()
+        dev.device = RefCurrent
+        dev.set_alias(reader.region_name + "/RefCurrent")
+        SENSORS.append(dev)
+        
+    #SENSORS.append(SampleCurrent)
+    #SENSORS.append(RefCurrent)
     adjust_sensors()
     set_adc_averaging()