2-1
4220 Flow Meter
Section 2 Programming
2.1 Getting Started You must program the 4220 Flow Meter to accurately monitor a
flow stream. You must also install the submerged probe level
sensor. The 4220 will usually also need a primary measuring
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.
Teledyne 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. Note
that 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 provided with each screen explains the reasons
for the various menu options.
2.1.1 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 4220 Flow Meter.
The letter C will appear when the flow meter is communicating
with a remote computer (Flowlink applications only). The letters
E or D will appear (Enable or Disable) when the sampler enable
function (step 6) is programmed by condition. (Programmed by
0000004.78 CF 1.13 FT 16-NOV-02
1.03 CFS (X X) 8:25:37