4230 Flow Meter
Section 2 Programming
2-10
VOLUME causes the flow meter to pace the sampler after a spe-
cific volume has passed through the flow stream.
CONDITIONAL allows pacing of the sampler by the flow meter
when a particular condition has been met, or has changed.
Among these conditions are changes in level, flow rate, temper-
ature, rainfall, (if you are using the optional rain gauge), dis-
solved oxygen, or pH. You can also use a pair of conditions, or if
you are using the YSI 600 sonde, you can select multiple condi-
tions from its sensors.
2.5.6 Sampler Enable Sampler Enable means that in a combination flow meter/sampler
pair, the flow meter controls the sampler's ability to run its own
program. The difference between step 5, sampler pacing, and
step 6, sampler enable, is that in sampler pacing, the flow meter
merely sends flow pulses to the sampler from time to time. The
sampler counts these flow pulses to determine when to take a
sample (according to its own programming).
With sampler pacing, the sampler is always enabled. With
sampler enabling, the flow meter can actually stop operation of
the sampler. The sampler is still set up to run its own program,
but the inhibit/enable line from the flow meter will determine
when and whether the sampler runs its program. This feature is
useful for storm water runoff monitoring applications, where it
may be necessary for the flow meter/sampler pair to have to wait
a long time between storm intervals.
Again, changing or meeting a condition or set of conditions
triggers the enabling. The conditions that can be used for
sampler enabling are similar to those used for sampler pacing:
level, flow rate, rainfall, temperature, dissolved oxygen, pH, or a
combination of these conditions. The YSI 600 Sonde provides
several measurements at the same time. You must have the
appropriate sensors for rainfall, temperature, D.O., pH, and the
YSI outputs.
2.5.7 Alarm Dialout Mode This feature allows you to program a 4230 to signal a remote
location through a telephone line. This feature is useful for trans-
mitting alarm conditions or other essential information to a
remote location.
Note
You must have the optional modem installed to make use of
this program step. The menus will not even appear unless the
flow meter has a modem installed.
The Alarm Dialout feature is useful if you need to signal a
remote location when there is a change of condition in the flow
stream that could constitute an alarm. You can program as many
as five different twenty-digit telephone numbers into the flow
meter in decreasing order of importance. The modem is capable
of speech.
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