Hach SL1000 Basic User Manual page 19

Error/Warning
Insert Chemkey in darker
environment. Too much
ambient light (2)
Low Light. Clean
Chemkey slot.
Meter requires service.
Meter does not detect
sample
Clean or replace parts
For some errors and warnings it is a requirement to clean the Chemkey slots, the optical windows,
the barcode window, the sample detector or to replace the trays. Use isopropyl alcohol to clean the
parts. Use water and a mild detergent to clean the light shield. Make sure to move the cotton tipped
applicator in one direction only. Refer to
and the trays. Refer to
Items to collect: Cotton tipped applicator, isopropyl alcohol, water and a mild detergent
Figure 10 Parts removal and reassembly
Possible cause
The ambient light is too high to
make a valid measurement.
Chemkey does not operate
correctly. Chemkey is not installed
correctly.
Module failure.
• The sample cup is not filled to
the fill line.
• The sample conductivity is less
than 2 µS/cm.
Figure 10
Figure 11 and Figure 12
Move the meter to a darker environment and
measure again.
• Put the Chemkey into the slot in one push.
• Use a new Chemkey.
• Clean the Chemkey slot. Refer to
on page 20.
• If the problem still occurs, contact technical
support.
Use the modules that operate correctly. Contact
technical support to repair the defective module.
• Make sure that the sample cup is filled to the
fill line.
• Make sure that the sample conductivity is
more than 2 µS/cm.
• Clean the sample detector. Refer to
on page 20.
• If the problem still occurs, contact technical
support.
to remove the optics access cover, the light shield
for the detailed cleaning procedure.
Solution
Figure 12
Figure 11
English 19