4230 Flow Meter
Section 2 Programming
2-38
Note
If you do not turn on the 4-20 mA output(s) in step 1, the
menus determining its (their) operation will not appear later in
the program. If you need this function and cannot find the
appropriate menus in step 2, return to step 1, Setup and
check to see that you have not inadvertently switched the
option off.
For each 4-20 mA output port turned on, the flow meter will
request entry of the type of data that will drive the output, along
with minimum and maximum values. Here is an example of
what you might see for programming analog output 1.
TEMPERATURE, DISSOLVED OXYGEN, CONDUCTIVITY,
SPECIFIC CONDUCTANCE, SALINITY, and TOTAL DIS-
SOLVED SOLIDS may also appear as driving conditions.
The choices available to you will depend on what parameter mea-
surements you have turned on previously and what accessories
(YSI, pH, DO probes, rain gauge, etc.) you are using with your
flow meter. After you select a choice, the flow meter will request
the minimum and maximum values for that choice:
4 MA in the second line of the display could also be 0 MA if that
is what you selected for the current loop minimum in Setup. The
units are the units of measure appropriate for the option you
selected; for example, feet or meters for level, degrees F or C for
temperature, mg/l for dissolved oxygen, etc. After you have set
the minimum value for the parameter, the flow meter will
request that you 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 outputs you activated previ-
ously in Setup.
DATA TYPE FOR ANALOG OUTPUT 1
• (OFF)••(LEVEL)••(FLOW RATE)••(VELOCITY)••(pH)•
ANALOG OUTPUT 1
4 MA = X.X (units)
ANALOG OUTPUT 1
20 MA = X.X (units)
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