Teledyne 4250, Installation And Operation Manual, Page: 71 / 204

4250 Flow Meter
Section 2 Programming
2-43
or C for temperature, mg/L for dissolved oxygen, etc. After you
have set the minimum value for the port, the flow meter will
request you to enter a value for full-scale, or 100%:
This value causes the port to transmit 100% or 20 mA. For
example if the data type selected for this output were level, and
the unit is measuring level in a four-foot pipe, you would enter a
full-scale value of four feet. If the actual level reading is cur-
rently two feet, the analog output would read 12 mA (50% if the
4-20 mA current range is selected) or 10 mA (50% if the 0-20 mA
current range is selected). The flow meter will then request that
you repeat the process of defining the data type and setting the
minimum and maximum values for any of the other analog ports
you activated previously in
Setup .
2.4.6 Step 3 - Parameter to
Adjust
This step lets you enter the measured level in the flow stream. It
also lets you calibrate the pH (acidity or alkalinity), D.O. (dis-
solved oxygen) parameter sensors, and the YSI 600 Multiple
Parameter Sonde. Note that there is no calibration step for the
temperature sensor because it does not need calibration. When
you select
step 3 the following will appear:
LEVEL will not show up if you are using the flow meter only for
parameter sensing. Likewise, pH and/or D. O. and YSI 600 will
not show up on the display if you have locked them out by pro-
gramming selections you made in
step 1 .
Remember that selection of either pH or D. O. in step 1 will keep
the other from appearing on the display in this or subsequent
programming steps. If the parameter you want does not appear
in this menu, exit the program and return to
Setup . Check to see
that you have not accidentally locked your choice out with selec-
tions you made in the early section of the program. If you select
NONE, the flow meter will advance to the next step. If you select
LEVEL, the following will appear:
First measure the level in the flow stream. This is usually done
with either a measuring stick. Generally, you should measure the
level
upstream from the AV sensor. The sensor should be
installed in an area of stable flow .
ANALOG OUTPUT PORT 1
20 MA =
X.X ( units )
PARAMETER TO ADJUST
• NONE • • (LEVEL) • • (pH) • • (D. O.) • • (YSI 600) •
ENTER CURRENT LEVEL
X.XXX FEET (or meters)