2-1
4230 Flow Meter
Section 2 Programming
2.1 Getting Started You must program the 4230 Flow Meter to accurately monitor a
flow stream. The 4230 will usually also need a primary mea-
suring device, a structure placed across a stream that regulates
flow. This section describes programming the flow meter with the
aid of the keypad and display. There are nine program steps that
control all aspects of the flow meter's operation.
Isco ships the flow meter with a program already installed that is
called the default program. You can use this program as an
example to see the flow meter's capabilities. The default program
is just to test the unit at the factory. The flow meter's internal
computer must always have something programmed into the
unit, so that becomes the default program. Your flow situation
will usually require other programming choices. The text pro-
vided with each screen explains the reasons for the various menu
options.
2.2 Operation of the
Display
The display is a two-line, forty character-per-line liquid crystal
(LCD). It has a backlight feature for easy viewing in low light sit-
uations. The display has three different operating modes,
normal, programming, and messages. In the normal mode, the
display shows such things as level, flow rate, total flow,
parameter measurement, etc. In the programming mode, the top
line of the display shows each step as you work through the
program while the bottom line shows the choices available for
that step. In the message mode, the display provides instruc-
tional information, such as how to leave programming, or what to
do if you have entered a number that is out-of-range.
Following is a “normal” display on the flow meter. This is typical
of what the flow meter will display when it is in the normal oper-
ating mode and you are not programming it.
An interpretation of the numbers on this display would be as
follows: Time and date will be replaced by pH/D.O. and temper-
ature if you are using parameter sensing. The (X X) to the right
of the time indicates letters that may appear from time to time
on the 4230 Flow Meter.
The letter C appears when the flow meter is communicating with
a remote computer (FLOWLINK applications only). The letter Z
will appear when the flow meter is doing an auto-zero. The letter
P will appear when the flow meter is purging the bubble line.
The letters E or D will appear (Enable or Disable) when the
Sampler Enable function (step 6) is programmed by condition.
0000004.78 CF 1.13 FT 16-MAR-94
1.03 CFS (X X) 8:25:37
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