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Isco 4700 Refrigerated Sampler
Section 3 Programming
REPEATABLE ENABLE?
YES
SAMPLE AT ENABLE?
YES
RESET SAMPLE
INTERVAL? YES
3.3.7 Refrigeration
SELECT OPTION: (<-->)
REFRIGERATION
TARGET TEMPERATURE
__ C
(1-9)
QUICK COOL FOR FIRST
DAY?
YES
3.3.8 Output Pins
3-6
2. Select YES for unlimited enable/disables. Select NO to
allow only one enable, after which the sampler will remain
NO
enabled until the end of the program sequence.
3. If your application requires a sample when the sampler
becomes enabled, select YES. Otherwise, select NO and the
NO
sampler will take the first sample at the programmed
interval.
4. Select YES to reset the time or flow pacing interval to zero
at the moment the sampler becomes enabled. Select NO
NO
and the sampler will continue with the current count.
The sampler controller is disabled when pin 6 of the External
Device connector is held at ground potential. Isco devices do this
by shorting pins 6 (Enable) and 2 (GND) together. A non-Isco
device can disable the sampler by using a relay contact closure to
short these two pins together. The sampler is enabled when pins
6 and 2 are no longer shorted, that is, pin 6 is open or allowed to
float.
One application that illustrates the enable feature is parameter
monitoring at the head works of a treatment plant. As long as
the measured parameter (pH, for example) is within the normal
range, the monitoring instrument disables the sampler. When
the parameter exceeds the normal range, the instrument enables
the sampler, which then collects samples at intervals specified by
the program.
Select this option to set the target temperature of the refriger-
ation system. The sampler will operate the cooling or heating
systems as needed to maintain this target temperature.
1. Select the REFRIGERATION option and press Enter.
2. Use the Number buttons to set the target temperature as
degrees Celsius. Press Enter to save the setting.
3. Single Bottle Only — Select YES to enable the Quick
Cool mode, NO to disable it.
NO
Quick Cool lowers the target temperature by 2.5°C for the
first 24 hours. This feature can be quite useful when col-
lecting warm liquids or larger sample volumes to draw
down the temperature quickly. To prevent the sample from
freezing, Quick Cool will not lower the target temperature
below 0.5°C.
Select this option to configure the four alarm outputs. An alarm
output is based one of the following events:
• PROGRAM STARTED – This event occurs when the
Start Time is met. For programs using NO DELAY TO
START, this will occur immediately when you press the
Run button. The alarm output signal lasts three
seconds.
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