Flow Mode Sampling; Enable Pin - Teledyne 5800 Installation And Operation Manual

Isco 5800 Refrigerated Sampler
Section 3 Programming

3.3.5 Flow Mode Sampling

SELECT OPTION: (<-->)
FLOW MODE SAMPLING
SAMPLE AT START?
YES

3.3.6 Enable Pin

SELECT OPTION: (<-->)
ENABLE PIN
REPEATABLE ENABLE?
YES
SAMPLE AT ENABLE?
YES
RESET SAMPLE
INTERVAL? YES
3-6
Select this option to indicate whether or not the sampler should
take a sample when the Run Program button is pressed. The
Sample At Start option is only applicable to Flow Paced
programs.
1. Select the FLOW MODE SAMPLING option and press
Enter.
2. Select YES to take the first sample when the start time is
reached. Select NO to wait until the flow count triggers the
NO
first sample.
If you select YES, when you run the program the sampler takes
the first sample immediately (if NO DELAY TO START, see section
3.5.20) and starts counting flow pulses for the next interval.
Select this option to specify which actions the sampler controller
should take when the Enable Pin state changes. The Enable Pin
feature allows an external device (section 2.8) to control the
running programs.
1. Select the ENABLE PIN option and press Enter.
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.