13. TROUBLESHOOTING GUIDE
PROBLEM CAUSE SOLUTION
No display Main power not switched on.
AC Adapter socket not inserted
properly.
Switch on the power supply.
Re-insert AC Adapter.
“Ur” (Under
range)
“Or” (Over
range)
in primary or
secondary
display
Measured value is out
of range.
Electrode not connected.
Electrode clogged, dirty
or broken.
Meter not calibrated.
Wrong temp value.
Check electrode is connected.
Clean or replace electrode.
Recalibrate the meter.
Confirm measurement condition.
Treat samples to bring within meter
measuring range.
Reset meter.
Slow response Dirty electrode.
Temperature of sample is
changing.
Clean the electrode.
Allow temperature to stabilize.
Meter not
responding to
key press
Manual HOLD or Auto HOLD
is active.
Worn keypad.
Press to deactivate manual
HOLD. See Section 9.4 to disable Auto
Hold feature if enabled.
Contact Technical Service.
Invalid key; Button is not
functional in the current
operation mode.
Press alternate key.
Select valid key depending on current
mode.
The conductivity calibration
standard is not within 40% of
expected value during
automatic calibration.
Ensure that the conductivity
electrode guard is attached.
Use fresh standard or use an alternate
calibration standard.
Secondary
display
continually
scrolls
The pH buffer is >1 pH unit
from the available pH buffers
remaining for calibration.
Use fresh standard or use an alternate
calibration standard. Verify the USA or
NIST buffer selection. Check pH
electrode.
20
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