Enter the Site, Fluid and Pipe Properties
The DXN has the ability to store over 300 sites . Each site contains fluid and piping characteristics as well as other settings that
are configured during meter commissioning . Sites are recallable from a pull-down menu each time the specific site is visited .
This makes period measurements of the particular site less time consuming . For further detail on sites, see
The DXN flow metering system calculates proper transducer spacing based on the piping and mounting method information
you enter into the flow meter via the touchscreen display .
The most accuracy is achieved when the transducer spacing is exactly what the flow meter calculates, so use the calculated
spacing if the signal strength is satisfactory . If the pipe is not round, the wall thickness not correct or the actual liquid being
measured has a different sound speed than the liquid programmed into the flow meter, the spacing can vary from the
calculated value . In that case, place the transducers at the highest signal level observed when moving the transducers slowly
around the mount area .
OTEE:
N
Transducer spacing is calculated on “ideal” pipe . Ideal pipe almost never exists, so you may need to alter the
transducer spacing . An effective way to maximize signal strength is to configure the display to show signal strength,
fix one transducer on the pipe and then—starting at the calculated spacing—move the remaining transducer small
distances forward and back to find the maximum signal strength point .
MPORTTNT
I
Enter all of the data on this list before mounting the transducers.
1 . Enter the pipe information .
a . For pipes conforming to ANSI specifications, fill in the information with the pull-down menus under
Setup > ANSI Pipe
.
– Pipe Material
– ANSI Schedule
– Nominal Size
– Liner (For Ductile Iron)
b . For pipes that do not conform to ANSI specifications, or where piping information is unknown, select
Use Manual
Entry
in the
Pipe Material
pull-down under the
Setup > ANSI Pipe
page, then fill in the information under the
Setup >
Pipe
page .
– Pipe Material (If the pull-down list does not contain the correct material, select the closest alternative .)
– Pipe OD
– Pipe Wall thickness (Use the numeric entry if the value is known, or use the pipe wall thickness gauge feature to
determine wall thickness . See
page 48
for details .)
OTEE:
N
Based on
Material
selection, a nominal value for roughness is already provided .
2 . Enter the liner information (if applicable) under the
Setup > Liner
page .
3 . Enter the transducer information
4 . For transit time flow measurement, enter in the appropriate information under the
Setup > Transit
page . See
for information on which items to select .
– Transducer
– Transducer Mount
5 . Record the
Required Spacing
value that was calculated and displayed after all previous steps have been completed . This
number will be needed when mounting the transducers . The distances are in inches if the flow meter is configured in
English units, or millimeters if configured in metric units .
Transducer Installation
Page 22
November 2016
HYB-UM-00090-EN-04
