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Example: Flow Paced Sampling Program
This example shows how to program the sampler to
collect a 100 ml sample every 10,000 gallons of liquid
that has passed the sampling point. The sampler will
composite the samples in one of its two 10-liter bottles.
The sampling program should begin counting the
elapsed flow at midnight and run continuously.
Because the program runs continuously, the sampler
will fill one bottle in a day, then fill the other bottle the
next day. Daily, an operator would only need to
exchange the completed bottle with an empty one and
the program could run indefinitely. However, service
intervals should be planned to replace worn pump
tubes.
This example assumes that the sampler has been
configured with 2 bottles (sections 2.4.4 and 3.3.2). It
also assumes the flow meter connected to the sampler
(sections 2.8) sends a flow pulse every 1,000 gallons.
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 FLOW PACED. Then press the Enter button.
TIME PACED
FLOW PACED
3. The sampler displays the pacing interval screen.
Type "10" using the Number buttons. Given that the
flow meter sends one flow pulse every 1,000
gallons, this would equate to a sample event every
10,000 gallons. Press the Enter button.
SAMPLE EVERY
___ PULSES (1-9999)
4. The sampler displays the Bottles Per Sample Event
screen. Because our program requires one bottle
for each sample event, type "1" using the Number
button and press Enter.
___ BOTTLES PER
SAMPLE EVENT (1-max)
CONFIGURE
Isco 4700 Refrigerated Sampler
5. The sampler displays the Bottle Switch screen. Our
program requires a bottle switch every 24 hours.
Select SWITCH ON TIME and press Enter.
SWITCH ON TIME
NUMBER OF SAMPLES
6. The sampler displays the Switch Bottles Every
screen. Type "24" for the hours and press Enter.
Then, type "0" for the minutes and press Enter.
SWITCH BOTTLES EVERY
___ HOURS, ___ MINUTES
7. The sampler displays the First Switch Time screen.
Our program must switch bottles at midnight. Type
"0" for the hours and press Enter. Then, type "0" for
the minutes and press Enter.
FIRST SWITCH TIME
AT HH:MM
8. The sampler displays the Run Continuously
screen. Select YES.
RUN CONTINUOUSLY?
YES
9. 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
10. The sampler displays the Sample Volume input
screen. Type "100" using the Number buttons and
press Enter.
SAMPLE VOLUME:
___ ml (10-max)
11. The sampler displays the Start Time option screen.
Select SET START TIME and press Enter.
NO DELAY TO START
SET START TIME
Section 3 Programming
NO
Continued...
3-23
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