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Process Instrumentation / Analyzer Systems / Weighing Technology / Valve Positioner / MI Digital Solution: Siemens Process Instrumentation lut400 Exit Active

Hello everyone,
we have a sitrans lut400 level controller and it was working fine.
then we has a wrong reading and when i checked, the current output is fixed on 1.6 mA 
all parameters are assigned correctly nothing was changed, i tried to simulate the output by setting 
the output current to manual, nothing changed
also i have measured using HART output but the same problem remains fixed on 1.8 mA
i checked the circuits inside it looks normal no damaged components 
also i tried MASTER RESET with no change. 
could anyone help with this issue ? 
Regards

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