Teledyne 4250, Инструкция по установке и эксплуатации, Страница: 80 / 204

4250 Flow Meter
Section 2 Programming
2-52
Then:
This option allows you to send flow pulses periodically to the
sampler during the time the conditions you established for
sampler pacing are not being met. Again, entering
0 sends no
pulses.
2.4.9 Step 6 - Sampler
Enable
The operation of step 6 , Sampler Enable is similar to step 5 ,
Sampler Pacing . The menus and options are similar. The dif-
ference is that where sampler pacing only causes the flow meter
to send a momentary signal (flow pulse) to the sampler, sampler
enabling actually controls an inhibit line to the sampler that can
keep the sampler from running its program. Sampler enabling is
useful where the sampler needs to remain idle for long periods of
time, such as
storm water runoff applications. When you select
or advance to step 6 , the following display will appear:
(Flowlink) may also appear. The Flowlink menu option will not
appear unless Flowlink software is installed.
DISABLE means that the sampler will be permanently inhibited
by the flow meter. This condition will remain until you change it
in this program step, or if you are using Flowlink, until it is over-
ridden by a command from Flowlink. Select the DISABLE option
with care; it will make the sampler appear to be inoperative, and
that could easily be misinterpreted as an equipment failure.
ENABLE means that the sampler is permanently enabled, free
to run its own program without any control from the flow meter.
This condition will remain until you change this menu option, or
until it is overridden by a command from Flowlink.
The STORM option will not appear unless you turned on rainfall
measurement in
step 1 . STORM selection is what you use when
you want to monitor storm water runoff.
STORM enabling is really a combination of conditions. First,
enter a value for LEVEL in the flow stream. Second, enter a
value for RAINFALL. Third, enter an amount of time over which
the rainfall occurs. Finally, you enter a time since the last
rainfall. You must have an Isco
674 Rain Gauge , or approved
equal to measure rainfall. The following menus are the STORM
sequence:
Then:
Then:
CONDITION FALSE PACING INTERVAL
PACE EVERY
X MINUTES
SAMPLER ENABLE MODE
• DISABLE • • ENABLE • • CONDITIONAL • • (STORM) •
LEVEL
GREATER THAN
X.XXX FT (or other units of measure)
RAINFALL AMOUNT
X.XX INCHES (or other units of measure)
RAINFALL TIME PERIOD
• 15 MIN • • 30 MIN • • 1 HR • • 2 HR • • 4 HR •