47
Tr
OUBLESHOO
TING
G
UIDE
19. TROUBLESHOOTING GUIDE
SYMPTOMS
PROBLEM
SOLUTION
Slow response/excessive drift. Dirty pH electrode.
Soak the electrode tip in
HI7061
cleaning solution for 30 minutes.
Refill with fresh fill solution.
Reading fluctuates up and
down (noise).
Clogged/dirty junction.
Low electrolyte level
(refillable pH electrodes
only).
Cable connection.
Soak the electrode tip in
HI7061
cleaning solution for 30 minutes.
Refill with fresh fill solution.
Check cable connection to meter and
verify protective cap is off.
While in pH reading mode,
-2.00 or 16.00 pH is displayed
blinking.
Reading out of range.
Check cable connection to meter and
verify protective cap is off. Check
the quality of the sample. Clean
the electrodes. Refill with fresh fill
solution.
The meter does not accept
the pH buffer solution for
calibration.
Broken pH electrode.
Replace the electrode or contact the
vendor.
The pump calibration can’t be
performed.
Broken pump tubing.
Wrong or contaminated
pump calibration solution.
Broken pH electrode.
Verify tubing, valve, syringe are
intact and solution passes when
pump is primed and no air bubbles
are present.
Check the pump calibration solution.
Verify electrode is calibrated. Prepare
another standard, prime the pump
and restart the calibration.
The temperature probe is
connected, but the meter
displays “MTC”.
Broken temperature probe. Replace temperature probe.