35
TROUBLESHOO
TING GUIDE
13. TROUBLESHOOTING GUIDE
SYMPTOMS
PROBLEM
SOLUTION
Slow response/excessive
drift.
Dirty pH electrode.
Refill with fresh fill solution.
Soak the electrode tip in
HI7061
cleaning solution for 30 minutes.
Reading fluctuates up
and down (noise).
Clogged/dirty junction.
Low electrolyte level
(refillable pH electrodes
only). Cable connection.
Refill with fresh fill solution.
Soak the electrode tip in
HI7061
cleaning solution for 30 minutes.
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
in fresh pH buffers. 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.
