Troubleshooting Guide - bluelab Guardian Monitor Instruction Manual

Troubleshooting Guide

Trouble
Nutrient reading
low
Temperature
reading inaccurate
pH reading
inaccurate
Display shows ERR
during calibration
No Display
A display shows or
ur
_ _ _ _
Bluelab Corporation Limited
Possible reason
Contaminated probe
Temperature of probe and
solution different
Temperature of probe different
to solution temperature
Contaminated probe
Using factory default calibration
Calibration old
An attempt was made to
calibrate with pH 4.0 or pH 10.0
calibration solution more than
one hour after calibration with
the pH7.0 solution
Old or contaminated solutions
used for calibration
Dirty or contaminated probe
pH Probe tip been allowed to dry
Probe damaged or old
Mains not switched on
Power adaptor not plugged into
the monitor
Over range value
Under range value
EC and pH cannot be determined
as temperature range is over /
under
(see technical specification range
page 14)
Possible solution
Clean probe (see page 13)
Wait 5-10 minutes for conductivity /
temperature probe to reach solution
temperature
Wait 5-10 minutes for probe to reach solution
temperature
Clean pH probe (see page 13). Replace probe
if in doubt
Wait longer for reading to stabilize before
calibrating
Calibrate pH probe – see page 8
Calibrate pH probe – see page 8
Calibrate to pH 7.0 again then do pH 4.0 / pH
10.0 calibration within one hour
Use fresh calibration solutions
Clean probe – see page 13
Hydrate pH probe – see page 5
Replace pH Probe
Switch mains power on
Plug power adaptor into the base of the
monitor labeled Power Inlet
Check all equipment for faults.
Check probes for signs of damage.
Test pH probe in calibration solutions and
conductivity / temperature probe in a known
conductivity standard solution to eliminate
these as a cause of this problem.
Check solution tank / reservoir for problems.
14
Bluelab Guardian Monitor
Version1:180809_bl