4230 Flow Meter
Section 2 Programming
2-14
If you select LEVEL READING INTERVAL, the following will
appear:
The LEVEL READING INTERVAL option is a way to conserve
power in battery-powered installations. If your installation is
AC-powered, you can simply select CONTINUOUS.
• For the 4230, there is little difference in battery
consumption between the choices.
If you need a faster response time, select a shorter interval. If
you are operating on battery power, you may have to seek a com-
promise between short reading intervals and battery life
expectancy. Any time you press a key, the flow meter reverts to
continuous operation for two minutes.
If you select PURGE INTERVAL, the following will appear:
PURGE INTERVAL refers to how often the flow meter dis-
charges a blast of air through the bubble line. These periodic
blasts are intended to keep the end of the bubble line clear from
any obstruction that could clog it, preventing it from releasing
any bubbles. The option of setting the purge interval is offered
for the sake of battery conservation.
If your bubble line shows a tendency to clog, characteristic of
dirty flow streams, you should select a more frequent purge. If
the stream is very clean and there appears to be no tendency to
clog the bubble line, you could try a less frequent purge.
However, if your installation is battery-powered, you should try
to get by with less frequent purges to prolong the battery life.
Some experimentation may be necessary to find the right setting
for your installation.
If you select SUPER BUBBLE MODE, the following will appear:
Super Bubble® is an Isco feature that increases the air supply
to the bubble line when the flow meter senses a rapidly rising
liquid level. This allows the level measurement to be more
accurate and to change more quickly. In operation, Super Bubble
resembles Purge in the way it forces a blast of air through the
bubble line, but the effect is different. Without Super Bubble,
there would be a period when no bubbles come out of the bubble
line when the level rises suddenly. Until the bubble rate is
re-established, the flow meter cannot accurately measure the
level.
Super Bubble helps maintain accurate level measurement by
filling the bubble line with air, thereby ensuring that the bubble
rate will re-establish quickly when the level stabilizes.
LEVEL READING INTERVAL
• CONTINUOUS • • 15 SEC • • 30 SEC • • 1 MIN • • 2 MIN • • 5 MIN •
PURGE INTERVAL
• 5 MIN • • 10 MIN • • 15 MIN • • 30 MIN • • 1 HR •
SUPER BUBBLE MODE
• ON • • OFF •
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