6700 Portable Sampler User Manual - Isco
6700 Portable Sampler User Manual - Isco
6700 Portable Sampler User Manual - Isco
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Command Driven Mode<br />
Charts showing the Command<br />
Driven screens appear in<br />
Figure 49, Command Driven<br />
Screens on page 134.<br />
61<br />
__ ft SUCTION LINE<br />
__ BOTTLES<br />
PUMP TUBE ALARM<br />
DONE<br />
<strong>6700</strong> SAMPLERS<br />
PRESSURIZED LINES<br />
The sampler can obtain samples from pressurized lines, as long<br />
as the line pressure remains below 15 PSI (pounds per square<br />
inch). Pressures greater than 15 PSI may prevent the sampler<br />
from purging the suction line; moreover, extreme pressures can<br />
force liquid past the pump, even when the pump is not running.<br />
For more consistent sample volumes from lines under constant<br />
pressure, calibrate the samples. <strong>Isco</strong> does not recommend sampling<br />
from pressurized lines.<br />
COMMAND DRIVEN OPERATION<br />
The <strong>6700</strong> controller can be placed in a mode where it is a slave to<br />
an external controller. The external controller is responsible for<br />
determining when to take a sample, how much volume to pump,<br />
and where to put the sample. The external controller directly<br />
interfaces to the sampler via an RS-232 communications port at<br />
2400 baud, 8 data bits, no parity, and 1 stop bit. A comma-separated-value<br />
protocol is used by the external controller to make<br />
requests, and by the sampler to report results. Use a standard<br />
computer connect cable (see Appendix E) toconnectthesampler’s<br />
interrogator port and the external controller.<br />
To enable the command driven mode, press 6 7 0 0 . 3 at the<br />
main menu. The sampler then displays its current command<br />
driven state (normally WAITING TO SAMPLE) and is ready to<br />
respond to valid commands from the external controller. From the<br />
WAITING TO SAMPLE screen, press the (Stop) key to check<br />
the sampler setup (screen 61). To change the setup, use the arrow<br />
keys to select the item to modify, and press enter. Select DONE to<br />
save the changes and return to command driven operation.<br />
To return to normal sampler operation, press 6 7 0 0 . 1 for<br />
standard programming or 6 7 0 0 . 2<br />
for extended programming<br />
while at the sampler setup screen (screen 61).<br />
While in the command driven mode the sampler will be quite<br />
limited in its functionality. Some of the limitations are:<br />
No modules<br />
No partition data<br />
No sample event log<br />
No reports<br />
No Flowlink communication<br />
No programmable I/O<br />
No sample calibration<br />
No rinses or retries<br />
Auto suction head (head based on line fill counts and line<br />
length)<br />
Purge times become a function of the line length<br />
Event is sent during the entire pump cycle.<br />
The <strong>6700</strong> <strong>Sampler</strong> will respond to three commands: GET STA-<br />
TUS, TAKE SAMPLE, and SET TIME. All commands must<br />
include the instruction set and a checksum value.<br />
103