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Example: Flow-proportional Constant Time Variable Volume
This example shows how to program the sampler to
collect flow-proportional samples volumes at fixed time
intervals. This program will collect a sample every 15
minutes. The sample volume will be dependent on a
4-20 mA flow rate input signal, which will collect a
3
100 ml sample at 1.0 m
s. The sampler will collect the
samples over a 24-hour period and place them in a
single bottle.
This example assumes that the sampler has been
configured with a single 10 liter bottle (sections 2.4.5
and 3.3.2). It also assumes a 20 mA signal represents
the channel's maximum flow rate of 1.0 m
When determining the sample volume, you must
consider the bottle capacity and the peak and average
flow rates. Note that in this example flow at the
maximum rate over a full day would yield a composite
sample of 9600 ml — nearly the capacity of the bottle.
However, flow rates at the collection point average 60%
of the maximum which would result in a bottle roughly
60% full.
1. Begin programming by selecting the PROGRAM
option from the Main Menu screen.
PROGRAM
VIEW LOG
2. The sampler displays the Time or Flow pacing
option screen. Use the Next or Previous button to
select TIME PACED. Then press the Enter button.
TIME PACED
FLOW PACED
3. The sampler displays the pacing interval screen.
Use the Number buttons to type the pacing interval
in hours and minutes (0 hours, 15 minutes). Press
the Enter button.
SAMPLE EVERY
___ HOURS, ___ MINUTES
4. The sampler displays the option to enter a sample
volume or use the defined volume. Select ENTER
SAMPLE VOLUME and press Enter.
ENTER SAMPLE VOLUME
USE DEFINED SAMPLE
Program
3
s.
CONFIGURE
Isco 4700 Refrigerated Sampler
5. The sampler displays the Volume Dependent On
Flow screen. Select YES and press Enter.
VOLUMES DEPENDENT
ON FLOW?
6. The sampler displays a screen to select the flow
rate input. Our sampler is connected to a 4-20 mA
input signal. Therefore, select ANALOG INPUT
and press Enter.
FLOW PULSES
ANALOG INPUT
7. The sampler displays a screen to set the sample
volume to collect at the maximum flow rate. Type
"100" and press Enter.
SAMPLE VOLUME AT
20 mA: ___ ml
8. The sampler displays the Composite Samples
screen. To finish the program after a 24-hour
period, type "96" (4 samples per hour × 24 hours)
and press Enter.
___ COMPOSITE
SAMPLES (0-max)
9. The sampler displays the Start Time option screen.
Select NO DELAY TO START and press Enter.
NO DELAY TO START
SET START TIME
10. The sampler displays the Programming Sequence
Complete screen for four seconds, then advances
to the Main Menu screen.
PROGRAMMING SEQUENCE
COMPLETE...
PROGRAM
VIEW LOG
To run the sampling program, press the green Run
Program button.
Section 3 Programming
YES
NO
CONFIGURE
3-25
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