Bluelab Combo Meter - Manual (Page 12)

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