Ionics Instruments 2004 Page 10-5 DLM 30007-08 Rev. A
The overall rate of flow through the inlet tubing should be the same as through
the outlet tubing. (The outlet flow is usually more variable than the inlet flow
because of its proximity to the sample pump.)
pH Of Sample Stream Is Too High
If the pH of the sample stream is not < 2, erratic readings and low TOC
recovery may be observed. The first step is to increase the acid flow rate by 1-
2 µL/min and determine if this eliminates the problem.
For non-deionized water, check the pH of the sample stream using the pH
paper supplied with the analyzer. To check the pH of the stream, locate the
sample outlet line on the right-hand side of the analyzer. If the outlet line is
accessible, measure the pH as described below. If the outlet line is connected
to the sample inlet block waste connection, the outlet line must be removed
from the sample inlet block.
Outlet
Disconnect here to measure pH
FIGURE 10-5: Outlet Tubing
Measure the pH (non-deionized water only)
With the sample stream flowing and the analyzer in the TOC Measurement
mode, tear off a strip of pH paper and hold the paper in the sample outlet
stream.
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