Hi ,

 I use SITRANS LU 10 & SITRANS LU OA WITH TRANSDUCER ULTRASONIC /TEMPERATURE :XPS-30  WHEN I CHEK P790 HARDWARE ERROR DISPLAY SHEW (FAIL) FAULTY SITRANS LU 10 . WHAT SHALL I DO ?

THANKS

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Split from Ultrasonic transmitters.

It's broken and there's nothing you can do about it.  It is not field repairable.  

LU-10 was discontinued as of Dec 1, 2016.  It is no longer available as a new unit.  [How's that for Murphy's Law (anything that can go wrong, will go wrong.) ]

You can investigate whether Siemens can repair it and at what price, but if the LU-10 is more an a couple years old, I'd say your you're gambling throwing good money after bad. 

Time to look at replacement technology.  

happy new year too ,

 I am confusion . I check all parameter is ok except P790 is shown fail . level system of silo given wrong reading , it is different from actual level of silo . we use SITRANS LU 10 and SITRANS AO with 10 sensor ( ultrasonic XPS=30 ) each silo have sensor . so if you have any idea to solve that problem please contact me .