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Problem
High area counts
and large RSD for
blanks
NPOC results too
high
Double peaks for
TN measurement
High and low area
counts within a
sample
Halogen scrubber
should be replaced
within days
System shows
"Leakage below
IC/Waste port"
Memory effect
IC vessel filled with
liquid
Possible cause
The tubes of the TN-
detector are defective.
In TC measurements, the
high temperature can cause
IC collection in the furnace.
When NPOC is measured
after TC, the collected IC
will break free and have an
effect on the area counts.
The ceramic wool layer in
the top of the furnace tube
is defective.
There is a problem in the O-
ring of the furnace exit.
There is a problem in the
furnace tube.
The halogen scrubber is not
assembled correctly.
The tubing of the condenser
is not assembled correctly.
There is liquid in the
detector chambers.
There is a problem in the
IC/waste port.
The furnace tube is dirty.
The IC pump is defective.
Solution
The tube has some tarnish. Contact technical
support.
Make sure to measure two NPOC blanks to
prevent defective NPOC measurements.
Replace the furnace tube.
Replace the O-ring and analyze 15 blanks.
A very small tear in the furnace tube can
cause a leak. Replace the furnace tube and
analyze 15 blanks.
Remove the halogen scrubber and install it
again.
Examine the tubing.
Identify if the particle filter is moist. If the filter
is wet, identify if the CO2 detector is moist.
Clean the CO2 detector as necessary.
• Replace the sensor.
• Remove the sensor below the leakage
container. Rinse the sensor with ethanol
and then with ultra pure water. Remove all
possible liquids from the sensor. Install the
sensor again.
Note: Make sure to install the sensor below the threshold
before assembling the analyzer.
Remove the furnace tube. Wait until the
furnace tube temperature decreases to
ambient temperature. Rinse the quartz and the
catalyst separately with ultra pure water.
Assemble and install the furnace tube in the
analyzer. Startup the furnace heat.
Contact technical support.
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