Teledyne 4250, Инструкция по установке и эксплуатации, Страница: 62 / 204

4250 Flow Meter
Section 2 Programming
2-34
After you press Enter , the following display will appear:
(You will have to use the arrow key to bring TRAPEZOIDAL onto
the screen.) Select ROUND PIPE.
Note
Where the program requests the dimension of a channel, mea-
sure the channel for accuracy. Do not rely on “nominal” dimen-
sions or specifications.
Press Enter . The following will appear:
If you select U-CHANNEL, the following will appear:
If you select RECTANGULAR, this will appear:
If you select TRAPEZOIDAL, this will appear:
Press Enter . The following display will appear:
E x i t t h e p r o g r a m . R e - e n t e r a n d a d v a n c e t o t h e A R E A
VELOCITY menu as follows:
This time, select DATA POINTS. Press Enter. The following
display will appear:
In general, the option of NONE will not show up on the display.
For the 4250, you can define the four sets of data points as either
level-to-flow rate data points or level-to-area data points.
(Level-to-area data points are used in 4250 applications where
the channel has an unusual or non-standard shape.) If, for
example, you had defined all four sets as level-to-flow rate sets,
and then wanted to define a set as level-to-area, NONE would
appear to tell you that no sets were available to define as
level-to-area data points.
AREA VELOCITY - CHANNEL SHAPE
• ROUND PIPE• •U-CHANNEL• •RECTANGULAR• •>
VELOCITY ROUND PIPE
DIAMETER =
X.XXX FT (or meters)
VELOCITY U-CHANNEL
WIDTH =
X.XXX FT (or meters)
VELOCITY RECTANGULAR
WIDTH =
X.XXX FT (or meters)
VELOCITY TRAPEZOID
TOP WIDTH =
X.XXX FT (or meters)
VELOCITY TRAPEZOID
BOTTOM WIDTH =
X.XXX FT (or meters)
AREA VELOCITY CALCULATION
• VELOCITY • • DATA POINTS •
DATA POINT SET
• ONE • • TWO • • THREE • • FOUR • • (NONE) •