7.0 Troubleshooting & Specifications
7.1 Troubleshooting guide
pH reading
inaccurate
pH calibration old or not calibrated. Carry out at least a 2-point pH calibration.
pH probe dirty. Clean and carry out pH calibration.
pH probe damaged or old. Replace pH probe.
Previous pH calibration attempt has failed, and
Bluelab Pro Controller is using factory pH
calibration.
Find cause of failed pH calibration and recalibrate.
Probe tip is not immersed. Ensure pH probe tip is always immersed in the
solution being measured.
indicators
flashing
pH calibration is over 30 days old. Carry out a pH calibration.
pH calibration
fails
Attempting to calibrate to pH 4 or pH 10 more
than an hour after pH 7 calibration.
Carry out pH 7 calibration, then pH 4 or pH 10
calibration within 1 hour.
pH probe dirty. Clean and carry out pH calibration.
pH probe damaged or old. Replace pH probe.
Conductivity
reading
inaccurate
Conductivity probe or 2.77 EC solution
contaminated.
Clean conductivity probe and check with
Conductivity Standard solution.
An air bubble is present on the conductivity
probe surface.
Tap the conductivity probe to dislodge air bubble.
Place conductivity probe in a position where air
bubbles won’t collect on its probe surface.
Conductivity probe tip not immersed in
solution.
Ensure conductivity probe tip is always immersed
in the solution being measured.
Conductivity
reading not
what expected
after EC
calibration
2.77 EC solution old. Conductivity solution will
change value over time, usually becoming
stronger, as water evaporates.
Always use fresh solution, from well- sealed
bottles/new sachets.
Conductivity probe was wet when placed into
EC solution, lowering value.
Ensure conductivity probe is dry before
calibrating/checking, or rinse in conductivity
solution first.
Temperature
reading is
inaccurate
Temperature probe not immersed in solution. Ensure temperature probe is always immersed in
the solution being measured.
Temperature Probe damaged. Replace temperature probe.
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