Troubleshooting Guide - bluelab Combo Meter Care And Use Manual

13.0 Troubleshooting guide

Trouble
Nutrient reading low
Temperature reading
inaccurate
pH reading inaccurate
pH reading does not
change from solution
to solution
Displays low
battery indicator
No display
Display shows 'Err'
Or
Ur
While in pH mode
Or
Ur
While in temp mode
Or
While in conductivity/
nutrient mode
12
Reason
Contaminated conductivity/
temperature probe.
Solution temperature low/
high.
Temperature of
conductivity/temperature
probe different to solution
temperature.
Contaminated pH probe /
glassware not clean.
Wick contaminated,
blocked or dry.
Incorrect pH calibration.
pH calibration unreliable.
pH probe damaged or old.
Broken glass bulb,
tube or connector.
Insufficient power to take a
reliable reading.
Batteries dead or inserted
incorrectly.
Problem with pH calibration. See error message descriptions in
Over range pH.
Under range pH.
Over range temperature.
Under range temperature.
Over range
conductivity/nutrient.
Correction
Clean conductivity/temperature probe
(see Section 7.0).
Wait 5 to 10 minutes for reading to
stabilize to a constant value.
Wait 5 to 10 minutes for conductivity/
temperature probe to reach solution
temperature.
Clean pH probe (see Section 8.0); then
calibrate (see Section 3.0).
Hydrate probe in KCl storage solution
for 24 hours, see Section 9.0. Do not
measure proteins or oils with this unit.
Replace unit.
Ensure calibration solutions are
accurate. Replace if in doubt.
Wait longer for readings to stabilize
before calibrating to a constant value.
Calibrate pH probe (see Section 3.0).
Replace pH probe.
Check pH probe for damage.
Replace probe.
Replace the batteries.
DO NOT use rechargeable batteries.
Check batteries are inserted correctly.
Replace if necessary.
Section 11.0 of this document.
Solution > 14.0 pH. Solution < 0.0 pH.
Check pH probe connection.
pH probe could be faulty.
Combo Meter could be wet inside.
Solution >51 °C / 122 °F.
Solution <0 °C / 32 °F.
Conductivity/temperature probe
or Combo Meter faulty.
Over range conductivity
>9.9 EC, 99 CF, 4950 ppm 500, 6930
ppm 700. Conductivity/temperature
probe or Combo Meter faulty.