Hach QP 1680-TOC/TNb Basis-Benutzerhandbuch Seite 20

Problem
Leakage or loss of
flow
No air bubbles in
the reagent bottle
UPW
Area counts too
high
20 English
Possible cause
There is a problem in the
furnace injection point.
There is a problem in IC
injection point.
There is a problem in
particle filter.
There is a leak after the
furnace tube is assembled.
The system startup does
not work.
There is a problem in the
needle or needle sleeve.
There is a problem in the
particle filter or a leak in the
system. The pH value of the
acid is incorrect.
Solution
Add a drop of UPW on top of the furnace
injection point. If there are air bubbles, remove
and fully clean the injection port. As an
alternative, replace the injection port.
• Add a drop of UPW on top of the IC
injection point. If there are air bubbles, use
a spray bottle to put some UPW into the IC
injection point.
• If the IC injection point continues to push
the UPW out, the condenser has a possible
blockage. Set the condenser temperature to
20 °C (68 °F). Wait 30 minutes. Use the
spray bottle to put some UPW into the IC
injection point. The flow should come back
to the standard value. Contact technical
support.
The analysis can form CuCl, which is a tiny
powder that can cause a blockage in the filter.
The blockage can increase the pressure,
which can cause the measured flow to be
lower than expected. Use compressed air to
clean the particle filter. Replace the particle
filter.
The O-ring that seals the bottom of the furnace
tube can expand or shrink during furnace
operation. Remove the complete furnace and
use a flathead screwdriver to tighten the O-
ring.
Make sure that the system starts up correctly.
If the startup is unsuccessful, the oxygen
valves can be damaged. Contact technical
support to replace the oxygen valves.
• Examine the needle and the needle sleeve
for damage.
• Make sure that the sleeve starts at 21 mm
from the bottom of the needle. Replace the
needle if necessary.
• Examine the particle filter. Replace the
particle filter if necessary.
• Make sure that the pH value of the acid is
less than 2.
• Compare the current flow of the instrument
to the flow of the samples in the calibration
line used to calculate the current samples.
The flow has an effect on the area
measured from a sample. A lower flow gives
a higher area count and vice versa.