Measuring Pipe - ABB 261GS Operating Instruction

4.4

Measuring pipe

In order for the pipes to be laid correctly, the following points
must be observed:
— Keep the measuring pipe as short as possible and avoid
sharp bends.
— Lay the measuring pipe in such a way that no deposits
can accumulate in it. Gradients should not be less than
approx. 8 % (ascending or descending).
— The measuring pipe should be blown through with
compressed air or, better yet, flushed through with the
measuring medium before connection.
— Completely depressurize the measuring pipe if the medium
is a fluid.
— Lay the measuring pipe in such a way that gas bubbles
(when measuring fluids) or condensate (when measuring
gases) can flow back into the process line.
— When measuring steam, lay the measuring pipe in such a
way that hot steam cannot flow back into the process
connection (water trap, e.g., a water trap pipe that is filled
with water before installation).
— Check the tightness of the connection.
14 IM/261Gx/Ax-EN Rev. 08 | 261Gx, 261Ax