diff --git a/frappy_psi/qnw.py b/frappy_psi/qnw.py
index 384d530..978232d 100644
--- a/frappy_psi/qnw.py
+++ b/frappy_psi/qnw.py
@@ -31,7 +31,7 @@ class QnwIO(StringIO):
 
 class SensorTC1(HasIO, Readable):
     ioClass = QnwIO
-    value = Parameter(unit='degC', min=-15, max=120)
+    value = Parameter(unit='degC', min=-55, max=150)
     channel = Property('channel name', StringType())
 
     def set_param(self, adr, value=None):
@@ -73,7 +73,7 @@ class SensorTC1(HasIO, Readable):
 
 class TemperatureLoopTC1(SensorTC1, Drivable):
     value = Parameter('temperature', unit='degC')
-    target = Parameter('setpoint', unit='degC', min=-15, max=120)
+    target = Parameter('setpoint', unit='degC', min=-55, max=150)
     control = Parameter('temperature control flag', BoolType(), readonly=False)
     ramp = Parameter('ramping value', FloatRange, unit='degC/min', readonly=False)
     ramp_used = Parameter('ramping status', BoolType(), default=False, readonly=False)