Teledyne 4250 Installation And Operation Manual page 69

DATA POINT flow conversion allows you to enter measured level
and flow rate values for a number of different points. The 4250
Flow Meter can accept up to four sets of data points with each set
containing as many as fifty points.
The flow meter then performs a three-point interpolation to cal-
culate a flow rate appropriate for the data entered. The common
use of data point flow conversion is with unusual primary mea-
suring devices, specifically devices that the 4250 does not
support in the WEIR/FLUME flow conversion set.
The level-to-flow rate data for such devices is usually available
from the manufacturer. From this data the flow meter can create
a flow conversion based on the relationship between the level and
flow rate. After the FLOW RATE UNITS menu has appeared, the
next menu is:
SET X (1-4): (0) POINTS ENTERED
• ADD POINT • • (UNITS) •
Then:
SET 1 DATA POINT 1
ENTER: 0.00 (level units) 0.000 (units of volume)
After you have entered the data point set the following will
appear:
SET X (1-4): XX (1-50) POINTS ENTERED
• (USE) • • EDIT POINT • • ADD POINT • • CLEAR • • PRINT •
UNITS, SAVE will also appear if you move the flashing cursor
with the right arrow key. USE will only appear after four points
have been entered. USE tells the flow meter that the set is com-
plete and can be used for the flow rate calculation.
Select EDIT POINT if you need to change either the level or the
flow value for a particular data point.
Select ADD POINT if you want to add another point to a data set.
CLEAR will erase an entire set of data points from the flow
meter's memory.
PRINT will make the flow meter print out the entire data set.
UNITS allows you to set or change the units of measure used in
the data set. Note that you can only set UNITS if the set is
empty, or you have cleared it. You cannot change the units once
you have entered data points into a set unless you clear it and
start over.
SAVE tells the flow meter to save the data set as it is.
If you select either EDIT POINT or ADD POINT, the following
display will appear:
SET X (1-4) DATA POINT XX (1-50)
ENTER: XX.XX (level units) XXX.XXX (volume)
4250 Flow Meter
Section 2 Programming
2-41