Water Soluble Organic Carbon Monitors; Auto-Collector - BRECHTEL 4001-115V Instrument Manual

6.7 Auto-collector

the IC is configured to perform the desired analysis. The liquid flow from the peristaltic
pump liquid sample channel not used by the IC may be routed to another analyzer, the
Brechtel Auto-collector to fill vials, or to the PILS waste bottle.

Water Soluble Organic Carbon Monitors

The Brechtel PILS has been successfully interfaced with on-line methods to measure
water soluble organic carbon (WSOC). This generally entails determining the minimum
liquid sample flow rate requirements of the WSOC device and ensuring this value is less
than the maximum deliverable liquid sample flow from the PILS (about 2 ml/min). If
the WSOC device requires a higher liquid flow then an additional peristaltic pump may be
used to add ultrapure MilliQ water to the PILS liquid sample flow. The next consideration
is flow rate matching. In practice, if the WSOC device requires 1 ml/min, the PILS should
be configured to deliver 1.25 ml/min, or some other value slightly higher than 1 ml/min,
so that a 'tee' liquid fitting can be installed on the line between the PILS and WSOC device
inlet to allow the excess liquid flow to go to a waste bottle. This setup ensures that the
WSOC device will not 'pull' or 'push' on the PILS liquid sample handling system and that
unacceptable pressure gradients do not develop between the two instruments. A final
consideration is air bubbles in the liquid sample line. Ensure that the PILS delivers air-
free liquid sample to the WSOC device, as many of these units are sensitive to entrapped
air.
6.7 Auto-collector
The Auto-collector may be purchased as an option to the PILS and is designed to allow
individual sample vials to be filled with liquid sample from the PILS. The basic compo-
nents of the Auto-collector include the vial carousel turntable, the needle assembly, the
vial holding carousel, control electronics and software. The Auto-collector is controlled
via RS232 communications and requires one AC power connection. The unit is shipped
with an executable program allowing the fill time for each vial to be set by the user as well
as the number of vials to fill. It is up to the user to calculate the vial fill volume based on
the liquid sample flow rate settings of the PILS. A photo of the front of the Auto-collector
is provided in figure 11. The rear of the Auto-collector is shown in figure 12.
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