4210 Flow Meter
Section 2 Programming
2-45
menus that do appear will depend on the flow meter type and
selections made earlier in the program. At least one of the condi-
tions will be available to you.
If you select LEVEL from CONDITION the following will appear:
After you select one of these options, the flow meter will request
that you enter a value, for example if you selected GREATER
THAN:
Enter a maximum value for the selected condition, which if
exceeded, will enable the sampler.
If you select LESS THAN, the flow meter will ask you to enter a
minimum value for the selected condition. If the condition falls
below that value later, the flow meter will enable the sampler.
If you select RATE OF CHANGE, the flow meter will ask you to
enter two values, one for the condition, and the other for a period
of time over which the change occurs.
After you have determined what condition will signal the
sampler and under what circumstances, the following menu will
appear:
This step allows you to trigger the sampler from a single con-
dition or from two conditions. Suppose you wanted to trigger the
sampler from only one condition and that condition was LEVEL.
You would select LEVEL as the condition, and then identify what
change in level would be the trigger. Then you would select
DONE for the SELECT OPERATOR step. Selection of DONE
will advance the flow meter to the next program step. Selection of
OR or AND will allow you to select another condition, and then
determine whether both conditions are necessary for enabling
(AND) or whether either condition will enable the sampler (OR).
If you select FLOW RATE:
You would select one of these options, and then enter a value, as
for LEVEL, previously.
The rest of the menus will appear the same as they did for
LEVEL and FLOW RATE. D. O., pH, TEMPERATURE, and
RAINFALL all require activation in step 1 and use of the appro-
priate sensor. Only one parameter condition (pH, D. O.) can be
measured by the flow meter at a time. pH and D. O. cannot
appear on the display at the same time.
It is possible to program the Sampler Enable option so that it
operates in two different modes, latching and non-latching. To
explain this, in the nonlocking mode the sampler will be enabled
only as long as the condition that caused the enabling remains
LEVEL
• GREATER THAN • • LESS THAN • • RATE OF CHANGE •
LEVEL
GREATER THAN X.XX FEET (or other units of measure)
SELECT OPERATOR
• DONE • • OR • • AND •
FLOW RATE
• GREATER THAN • • LESS THAN • • RATE OF CHANGE •
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