Hach QbD1200+ Manual page 21

Problem
The measurements take too
much time to complete and/or
the results are consistently too
low.
The UV reactor does not work.
The sample is not found.
Significant carryover occurs
from sample to sample.
A pressure error frequently
shows during the system health
test.
Measurements frequently show
the result as "0".
The report output contains no
information.
Changes are not saved when
the instrument power is set to off
then on.
The qualification procedure
does not start.
The USB import and/or export
function does not operate with a
USB flash drive.
The network connection does
not show.
Possible cause
The UV reactor is almost
expired.
The fittings around the reactor
are loose.
The UV reactor is expired or
damaged.
There is not enough solution in
the reagent bottle.
The sample tube is not
connected to the auto sampler
or it is not in the sample flask.
A hardware failure.
The reactor is not fully flushed
after each measurement.
The carrier gas is empty or
low.
The background TOC reading
is larger than the sample TOC
reading.
An error occurred when a
report was made.
An error occurred when a
setting was changed.
An error occurred during a
qualification procedure.
The USB flash drive is not
connected.
The USB flash drive is not
found or is corrupt.
The ethernet cable is not
connected.
Solution
Replace the UV reactor. Make
sure that there is a sufficient
quantity of carrier gas.
Make sure that the fittings
around the reactor are tight.
Replace the UV reactor.
Contact technical support.
Fill the reagent bottle with
solution.
Make sure that the sample tube
is connected to the auto
sampler or that it is in the
sample flask.
Make sure that there is a
sample to use for the
procedure. Contact technical
support.
Examine the carrier gas supply.
If the problem continues,
contact technical support.
Fill the reagent bottle with
water, then do a new
background qualification
procedure.
Contact technical support.
Connect the USB flash drive to
the instrument.
Fix or format the USB flash
drive (if necessary), then
connect it to the instrument.
Make sure that the ethernet
cables is connected to the
instrument.
English 21