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Section 8 Troubleshooting
8.1 Error codes
Indication Cause User Actions
No display
Auto power off has
cleared display.
Push the power button.
Unstable
reading
Dirty probe.
Follow the probe cleaning procedures described in
this manual.
Dirty probe/meter
connectors.
Clean the probe contacts on the probe cable
connector and on the meter with methanol and a
cotton swab and let dry completely. Reconnect the
probe to the meter. Refer to section Section 7 on
page 37 for information about cleaning the probes
and connections.
Reference junction
not flowing.
Follow warm buffer cleaning procedures. Refer to
Section 7 Maintenance on page 37for warm buffer
cleaning instructions.
IFSET probe not
properly hydrated.
Soak the probe for at least five minutes in the pH
7.00 buffer.
Interference from
other devices.
Remove the other devices from the solution. Unplug
the water baths, stirrers, etc.
Interference from
direct sunlight.
If working outside, shield the probe from direct
sunlight.
Probe is in a very
low ionic strength
solution.
A stable reading may not be possible.
pH or temperature
of solution is
changing.
A stable reading is not possible until the pH and
temperature is constant.
Trouble
calibrating.
The display
does not stop
flashing
during
calibration.
The probe sensor
surfaces are dirty
or the probe needs
reconditioning.
Follow the cleaning and recondition instructions.dry
completely. Reconnect the probe to the meter. Refer
to Section 7 Maintenance on page 37for information
about cleaning dirty probes.
The referring
junction is not
flowing
Replace DO probe membrane
and fill solution. If error persists, replace probe.
Nominal=0.1822 ppm/mV
The buffers may be
contaminated or
expired.
Replace DO probe membrane and fill solution. If
error persists, replace probe. Nominal = 0.0 mV at
0% saturation; 45mV at 100%
Interference from
direct sunlight.
Attach temperature sensor to the 3.5 mm phono jack.
DO readings are highly temperature dependent and a
temperature sensor must be attached.
If trouble persists,
the probe may
have reached the
end of its useful life
and may need to
be replaced.
Replace the probe. Refer toSection 10 Contact
Information on page 47 for information about
contacting the manufacturer for replacement parts.
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