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FDT-25W Wall Mounter Ultrasonic Flowmeter
33
user-type-wedge parameters that describe the user transducers.
If the PI-type transducer is selected, you need enter additional 4 PI-type transducer parameters that
describe the PI-type transducers.
4.35 How to use the circular display function
When entering menu window 95, the circular display function will be started automatically. The
following windows will be displayed one by one, each window will stay for 8 seconds:
M95>>M00>>M01>>M02>>M02>>
M03>>M04>>M05>>M06>>M07>>M08>>M90>>M91>>M92>>
M93>> M94>>M95. This function allows the user to visit all the important information without any
manual action.
To stop this function, simply press a key. Or switch to a window other than M95.
4.36 How to enter into the linearity correcting? How to enter into the
data?
When the product leaved the factory, the function is closed.
The menu can realize almost 12 parts linearity correcting. The user can choose from two points to
twelve points to execute the linearity correcting according to user actual condition.
In order to explain the usage method of the menu, we suppose that we get the following table data
through calibration the meter.
Reference
standard
equipment flow (m
3
/h)
Instrumented
show
flow (m
3
/h)
Correction coefficient
(standard / show value)
1.02
0.0998
1.02
5.11
5.505
0.93
10.34
10.85
0.95
20.45
19.78
1.03
50.56
51.23
0.99
In order to revised the flow exceed the scope of the above table, without mutations of correction factor,
we add two points on the basis of the above five points, (0 m
3
/h, 1.0) and (100000 m
3
/h, 1.0). (0 m
3
/h,
1.0) is called the minimum flow of the amendment point, this set of data is used to facilitate to
generated a appropriate correction factor when Instrumented show flow under 1.02 m
3
/h. (100000 m
3
/h,
1.0) is called the maximum flow of the amendment point, this set of data is used to facilitate to
generated a appropriate correction factor when Instrumented show flow above 50.56 m
3
/h. So that we
get the following data sets from small to large.
( 0
,
1
)
( 0.0998
,
1.02
)
( 5.505
,
0.93 )
( 10.85
,
0.95 )
( 19.78
,
1.03 )