diff --git a/cfg/dil5_cfg.py b/cfg/dil5_cfg.py
index 3b8065b0..d5b9d1b4 100644
--- a/cfg/dil5_cfg.py
+++ b/cfg/dil5_cfg.py
@@ -292,7 +292,7 @@ Mod('dil',
 
 ## Dilution lakeshore Temperature controller
 
-Mod('io_ls273',
+Mod('io_ls',
     'frappy_psi.ls372.StringIO',
     'io for Ls372',
     uri=lsc_uri,
@@ -301,7 +301,7 @@ Mod('io_ls273',
 Mod('sw',
     'frappy_psi.ls372.Switcher',
     'channel switcher',
-    io = 'io_ls273',
+    io = 'io_ls',
 )
 
 Mod('T_ivc',
@@ -338,4 +338,32 @@ Mod('T_mix',
     channel = 5,
     htrrng = '1mA',
     switcher = 'sw',
+    meaning = ['temperature', 30],
 )
+
+Mod('htr_sorb',
+    'frappy_psi.ls372.SorbHeater',
+    'sorb heater',
+    io = 'io_ls',
+    output = 1,
+    fullpower = 5,
+)
+
+Mod('htr_still',
+    'frappy_psi.ls372.SorbHeater',
+    'sorb heater',
+    io = 'io_ls',
+    output = 2,
+    fullpower = 0.2,
+)
+
+#Mod('T_sorb_reg',
+#    'frappy_psi.picontrol.PIctrl',
+#    'controlled mix ch. temperature',
+#    input_module = 'T_sorb',
+#    output_module = 'htr_sorb',
+#    output_min = 0,
+#    output_max = 3.6,
+#    p = 0.05,
+#    itime = 120,
+#   )
diff --git a/frappy_psi/dilution.py b/frappy_psi/dilution.py
index 03a2bbe0..35755778 100644
--- a/frappy_psi/dilution.py
+++ b/frappy_psi/dilution.py
@@ -187,7 +187,7 @@ class Dilution(HasStates, Drivable):
             pulse_time = 60 * self.pulse_factor / pdump
             if pulse_time > 59:
                 self.log.info('open V9')
-                self.condense_value.write_target(1)
+                self.condense_valve.write_target(1)
             else:
                 self.log.info('V9 pulse %r', pulse_time)
                 self._start_time = state.now
@@ -222,11 +222,12 @@ class Dilution(HasStates, Drivable):
     def circulate(self, state):
         """Zirkuliert die Mischung."""
         if state.init:
+            # self.value = V.circulating
             self.handle_valves(**self.condense_valves)
         if self.wait_valves():
             return Retry
         self.check_valve_result()
-        self.value = V.circulating
+        # self.value = V.circulating
         return Finish
 
     @status_code(BUSY, 'remove (wait for turbo shut down)')
@@ -234,6 +235,7 @@ class Dilution(HasStates, Drivable):
         """Entfernt die Mischung."""
             
         if state.init:
+            # self.value = V.removing
             self.handle_valves(**self.remove_valves)
             if self.turbopump is not None:
                 self._start_time = state.now
@@ -282,6 +284,7 @@ class Dilution(HasStates, Drivable):
             return Retry
         self.check_valve_result()
         self._warn_manual_work = True
+        # self.value = V.off
         return self.final_status(WARN, 'please check manual valves')
 
     def read_status(self):
diff --git a/frappy_psi/ls372.py b/frappy_psi/ls372.py
index 1cbfbe93..bbec51f7 100644
--- a/frappy_psi/ls372.py
+++ b/frappy_psi/ls372.py
@@ -26,11 +26,12 @@ the hardware state.
 """
 
 import time
+from math import sqrt
 
 import frappy.io
 from frappy.datatypes import BoolType, EnumType, FloatRange, IntRange
 from frappy.lib import formatStatusBits
-from frappy.core import Command, Drivable, Parameter, Property, CommonReadHandler, CommonWriteHandler
+from frappy.core import Command, Drivable, Parameter, Property, CommonReadHandler, CommonWriteHandler, Writable, HasIO
 from frappy.extparams import StructParam
 from frappy_psi.convergence import HasConvergence
 from frappy_psi.channelswitcher import Channel, ChannelSwitcher
@@ -196,7 +197,7 @@ class ResChannel(Channel):
     enabled = Parameter('is this channel enabled?', datatype=BoolType(), readonly=False)
     pause = Parameter('pause after channel change', datatype=FloatRange(3, 60, unit='s'), readonly=False)
     dwell = Parameter('dwell time with autoscan', datatype=FloatRange(1, 200, unit='s'), readonly=False)
-    filter = Parameter('filter time', datatype=FloatRange(1, 200, unit='s'), readonly=False)
+    filter = Parameter('filter time', datatype=FloatRange(0, 200, unit='s'), readonly=False)
 
     _toggle_autorange = 'init'
     _prev_rdgrng = (1, 1)  # last read values for icur and exc
@@ -377,6 +378,35 @@ class TemperatureChannel(ResChannel):
         return self.value if self.enabled else 0
 
 
+class SorbHeater(HasIO, Writable):
+    value = Parameter('heater output', FloatRange(0, unit='W'))
+    target = Parameter('heater output', FloatRange(0, unit='$'), readonly=False, default=0)
+    output = Property('output channel', IntRange(0, 2), default=1)
+    heater_range = Parameter('heater range', IntRange(0, 1), readonly=False)
+    target_max = Parameter('max power', FloatRange(0, unit='$'), readonly=False, default=5)
+    fullpower = Parameter('power at 100 %', FloatRange(0, unit='$'), readonly=False, default=5)
+
+    def write_target(self, value):
+        percent = 100 * sqrt(value / self.fullpower)
+        ch = self.output
+        on = bool(value)
+        if on != bool(self.heater_range):
+            self.write_heater_range(on)
+        percent = parse1(self.communicate(f'MOUT {ch},{percent};MOUT?{ch}'))
+        return (percent * 0.01) ** 2 * self.fullpower
+
+    def read_value(self):
+        percent = parse1(self.communicate(f'MOUT?{self.output}'))
+        return (percent * 0.01) ** 2 * self.fullpower
+
+    def write_heater_range(self, value):
+        ch = self.output
+        return parse1(self.communicate(f'RANGE {ch},{value};RANGE?{ch}'))
+
+    def read_heater_range(self):
+        return parse1(self.communicate(f'RANGE?{self.output}'))
+
+
 class TemperatureLoop(HasConvergence, TemperatureChannel, Drivable):
     loop = Property('lakshore loop', IntRange(0, 1), default=0)  # TODO: implemented specific issues of loop 1
     target = Parameter('setpoint', FloatRange(0, unit='$'))