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Problem
The instrument
will not come
on.
The chlorine
readings are
low.
The chlorine
readings are
low.
The total
chlorine
readings are
high or low.
The readings
are low.
The readings
are low.
22 English
Possible cause
The batteries are not
installed in the correct
orientation.
The battery power level
is low.
The sample containers,
sample vials, caps and
other items that
touched the sample
have a chlorine
demand.
The sample was not
analyzed immediately.
The reagents were
added in an incorrect
sequence.
The reagent blank
value is not correct or
missing.
The reagent bottle was
not closed immediately
after use. The solvent
in the reagent
evaporated or the
reagent was
contaminated.
Solution
Make sure the battery orientation is
correct.
Replace the batteries if the battery
power level is low. Use only non-
rechargeable batteries.
Collect samples in clean glass
bottles. Do not use plastic
containers. Plastic containers can
have a large chlorine demand.
Pretreat items that the sample may
touch to remove chlorine demand.
Refer to the instructions in the
Sample Collection section of the test
procedure.
Analyze the samples immediately.
Chlorine is a strong oxidizing agent
and is unstable in natural waters.
Make sure that the reagents are
added to the sample vial in the
sequence given in the test
procedure.
Make sure to do a reagent blank
calibration before a set of new
reagent bottles is used. Refer to
a reagent blank calibration
on page 16.
If the problem continues, do a
calibration check. Refer to
calibration check
Discard the set of reagent bottles.
Use a new set of reagent bottles. Do
a reagent blank calibration. Refer to
Do a reagent blank calibration
on page 16.
Close the reagent bottles
immediately after use.
Do
Do a
on page 17.
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