Maintenance
82
Symptoms Problems Solution
Slow response/excessive
drift.
Dirty pH electrode.
Clean the electrode and then soak
the tip in HI 7061 or HI 8061 for 30
minutes.
Readings uctuate up
and down (noise).
pH: Clogged/dirty
junction. Low electrolyte
level (rellable
electrodes only).
Clean the electrode. Rell with fresh
solution (for rellable electrodes only).
Check cable and connectors.
EC: EC probe sleeve not
properly inserted; air
bubbles inside sleeve.
Reinstall the sleeve. Tap the probe to
remove air bubbles. Move to center
of beaker. Verify top hole in sleeve is
covered with solution.
DO: DO probe electrolyte
contains entrapped gas.
Remove cap. Rell, tap and reinstall.
The meter does not
accept the buer/
standard solution for
calibration.
pH: Dirty electrode or
contaminated buer.
Follow the cleaning procedure. If still
no results, replace the electrode.
Replace buer.
EC: The EC probe is
defective.
Follow the cleaning procedure. If still
no results replace the probe. Verify
correct standard is selected.
If the display shows: “pH”
and “-2.00” or “16.00”
blinking.
Out of range in the pH
scale.
A) Verify that the shipping cap has
been removed.
B) Make sure the pH sample is in the
specied range.
C) Check electrolyte level and general
state of the electrode.
The display shows EC,
TDS or NaCl readings
blinking.
Out of range in EC, TDS
or NaCl scale.
Verify the plastic shipping spacer has
been removed from probe. Recalibrate
the probe. Make sure the solution is in
specied range. Make sure the range is
not locked. (Select Auto range)
The display shows DO
reading blinking.
Out of range in DO scale.
Verify area of cathode is free of bubble
inside cap. Verify solution movement
past membrane. Remove cap, inspect
and clean if necessary. Install new
cap, fresh electrolyte with no bubbles,
permit longer polarization. Stir or
increase ow rate.
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