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3-3
1010PVNFM-3A
Section 3
We recommend Reflect mount whenever possible. This is the simplest way to mount the trans-
ducers. 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 au-
tomatically without user-participation. In addition, Reflect mount 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 usually improves performance with
sonically attenuative liquids or pipe materials. We recommend using Direct mount for plastic
pipes. Compared to Direct mounting, Reflect mount requires almost double the amount of a
straight pipe run. Therefore, Direct mount may be the only option if the availability of mount-
ing space is limited.
3.1.4 PREPARING THE PIPE
1. 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.
2. Decide on your mounting mode (Direct or Reflect). Always use Reflect Mode whenever
possible. You may only need to use Direct Mode if your pipe is plastic.
3. 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 abrasive material provided to provide a clean contact surface for the transducers.
4. Refer to the next sections for illustrated instructions on how to locate each area to be
cleaned and how to use each mounting option.
Please note that the instructions show vertical mounting for clarity purposes only. Do
not install transducers on the top of a pipe.
Upstream
Transducer
Sonic Path
Pipe
Downstream
Transducer
DIRECT MOUNT
(Pipe shown in top view for ease in visualizing sonic path)
PREPARING THE PIPE SURFACE
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Cleaned areas. Clean an area 1/2” on either
side of transducer and additional 1/2” along the
length of the transducer.
Pipe