Ionics Instruments 2004 Page 3-4 DLM 30007-08 Rev. A
draws the sample into the analyzer at a flow rate of about 0.35 mL/min. The
waste is removed through a second 1/16" OD Teflon tube to a waste
container. The 1/16" OD Teflon tubes are found in the accessories kit.
Calibration Valve
The analyzer can also be equipped with a two-position switching valve.
Installed at the inlet to the analyzer, this valve allows switching between on-
line and container sampling without removing any tubing. The valve does not
contaminate the sample, even for low-level TOC measurements.
To waste bottle
Remove on-line waste line
Figure 3-2: View of Calibration Valve
Chemical Reagent Reservoirs
Two chemical reagents are used in the analyzer: 6M phosphoric acid (H
3
PO
4
)
and 15% ammonium persulfate ((NH
4
)
2
S
2
O
8
). A supply of these reagents for
approximately three months of continuous operation is stored in sealed
containers in the analyzer. The reagents are prepared using low-TOC,
deionized water under controlled conditions. The reagents are then packaged
to eliminate possible contamination of the sample by organic compounds.
When exhausted, the reagent supplies are simply replaced.
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