Teledyne 4250, Installation And Operation Manual, Page: 84 / 204

4250 Flow Meter
Section 2 Programming
2-56
The intervals above are the periods of time over which the
rainfall occurs. The amount of rain entered in the previous step
and detected by the rain gauge must fall during the time interval
chosen from this menu before the flow meter recognizes the event
as a storm. The next menu defines the interval that must pass
between storm events.
If you select CONDITIONAL for alarm dialout, the following will
appear:
(TEMPERATURE), (RAINFALL), (YSI pH), (YSI DO), (YSI
CONDUCTIVITY), and (YSI TEMP) may also appear. As men-
tioned previously, some of these menu options may not appear
depending on selections you made earlier in the program. At
least one of the options will be available to you. As mentioned for
other program steps, some of these menu options may not appear
depending on the flow meter you have and choices you made
earlier in the program. D. O., pH, TEMPERATURE, and
RAINFALL all require activation in
step 1 and connection of the
appropriate sensor to the flow meter. D. O. and pH will never
appear together, as only one can be used at a time. When you
have selected the condition you want, the display will advance to
the following:
For these conditions, you enter an amount which if exceeded
(GREATER THAN), or if dropped below (LESS THAN), or if
changed too quickly (RATE OF CHANGE), will activate the
alarm dialout. For RATE OF CHANGE, you enter two values:
amount and time over which change occurs . Then the
display will advance to the following:.
As described for sampler enabling previously, this step allows
you to combine conditions to produce an alarm dialout signal.
Select DONE if you don’t need more than one condition to trigger
the alarm.
If you want either of two conditions to trigger an alarm, select
OR.
If you want both of two conditions to be met before signalling an
alarm, select AND. Selection of DONE will advance you to the
next display menu. Selection of OR or AND will return you to the
CONDITION menu to select the other condition.
TIME SINCE LAST RAINFALL
DAYS:
X (allowable entry of 1-7)
CONDITION
• (LEVEL) • • (VELOCITY) ••(FLOW RATE) • • (D. O.) • • (pH) •
CONDITION
• GREATER THAN • • LESS THAN • • RATE OF CHANGE •
SELECT OPERATOR
• DONE • • OR • • AND •