LaMotte DO 6 Dissolved Oxygen Meter - Manual (Page 43)

9 TROUBLE-SHOOTING GUIDE
Problem Cause Solution
No
display
when
turned on a) Batteries not in place
b) Batteries not in
correct polarity (+
and – position).
c) Weak batteries
a. Remove rubber
boot/stand. Check
that batteries are in
place and making
good contact.
b) Reinsert batteries
with correct polarity.
c) Replace batteries.
Unstable
readings a) Insufficient
electrolyte in probe.
b) Air bubbles trapped
around the probe
c) Dirty or damaged
probe
d) Probe not deep
enough in sample
e) External noise
pickup or induction
caused by nearby
electric motor.
f) Broken probe.
a) Fill probe with
electrolyte & replace
pre-membraned cap
b) Stir or tap probe to
remove bubbles.
c) Clean the probe and
re-calibrate
d) Make sure sample
entirely covers the
probe sensors.
e) Move or switch off
interfering motor.
f) Replace probe.
Slow
response a) Dirty / Oily probe.
b) Temperature is
changing.
a) Clean probe. See
“Probe Care &
Maintenance”.
b) Allow time for
temperature to
stabilize
Not
respondin
g to key
press a) HOLD operation
indicated by flashing
display.
b) Damaged key pad
c) Internal program
error.
a) Cancel HOLD mode.
b) Return to dealer.
c) Reset all internal
programs by
reinserting batteries.
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