Preparing The Pipe - Siemens SITRANS FUS1020 Manual

Section 3
We recommend Reflect mounting whenever possible. This is the simplest way to mount the transduc-
ers. Also, Reflect mount resists abnormal flow profile conditions such as cross-flow within the flow
stream. Reflect Mode supports the AutoZero function, which zeroes the meter automatically without
stopping flow. In addition, Reflect mounting may be the only possibility if conditions do not allow access
to the opposite side of the pipe.
Direct mount provides a shorter sonic beam path. This can improve performance with sonically at-
tenuative liquids or pipe materials. Compared to Direct mounting, Reflect mount requires almost double
the amount of mounting length. Therefore, Direct mount may be the only option if the availability of
mounting space is limited.
Upstream
Transducer
Sonic Path
(Pipe shown in Top View for ease in visualizing sonic path)

3.3.4 PREPARING THE PIPE

Pick a mounting location with the longest straight run. You must have easy access to at least one
side of your pipe. The mounting location must remain full, even at zero flow.
Always use Reflect Mode whenever possible.
After receiving the spacing dimensions from the Installation Menu, prepare the pipe sur-face. De-
grease the surface, if necessary, and remove any grit, corrosion, rust, loose paint, etc. Use abra-
sive material to provide a clean contact surface for the transducers.
Refer to the following paragraphs for illustrated instructions on how to locate each area to be
cleaned and how to use each mounting option.
NOTE: Only install transducers on a pipe at the 3 o'clock or 9 o'clock positions. Do not install
transducers on the top of a pipe.
PREPARING THE PIPE SURFACE
Downstream
Transducer
DIRECT MOUNT
1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9
Pipe
1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9
3-6
Pipe
Cleaned areas. Clean an area 1/2" on either side of
transducer and an additional 1/2" along the length
of the transducer.
1020NFM-1D