ISCO 6700SR - Presample and Postsample Purge Counts; I;O Pin Programming

6700SR Refrigerated Sampler
93
Presample and Postsample Purge Counts
The presample purge is when the pump runs in reverse clearing
the strainer of any debris before taking a sample. The presample
purge is set at 200 pump counts. After the sample is taken a post-
sample purge occurs to clear the liquid from the suction line. The
duration of the postsample purge is determined by the length of the
suction line to maximize the battery life. The pre- and postsample
purge can also be manually set.
I/O Pin Programming
Pins C, H, and I on the Rain Gauge Connector are user-configured
as I/O1, I/O2, and I/O3 (Input/Output pins) respectively. Each pin
can be either an input for sampler enabling, or an output for alarms
such as PROGRAM DONE, RUN ERROR, etc. The CONDITIONS
I/O output can report alarm conditions using the parameters the
6700 is configured to measure. Similar to the Sampler Enable, you
can set thresholds for one or two conditions and the CONDITIONS
output can then trigger alarms when the measured parameters ex-
ceed the threshold.
Isco offers an I/O module that interfaces the sampler with a large
number of non-Isco devices. For more information about the I/O
module, contact your sales representative.
Presample Purge Rinse Cycle Pump Volume 1 Pump Volume 2 Pump Volume 3 Postsample Purge
Event Mark
Event Mark
Bottle Number
Event Mark
Bottle Number
Bottle Number
Pulse at Beginning of
Presample Purge
Pulse at Beginning of
Forward Pumping Only
Variable Duration Pulse
During Entire Pump Cycle
Event Mark
Bottle Number
Variable Duration Pulse
During Forward Pumping
Only
Figure 20 Event Mark Timing Diagram
Using the Purge-Count
screens
50
PRE-SAMPLE PURGE:
____COUNTS
(10-9999)
51
POST-SAMPLE PURGE:
DEPENDENT ON HEAD
FIXED COUNT
52
POST-SAMPLE PURGE:
____COUNTS
(10-9999)
Note
The state of the I/O lines is not de-
fined when the sampler is OFF.