Problem Possible cause Solution
The meter continually
shows –2.00 or 19.99 with an
electrode attached. The "ISFET" icon
does not show when ISFET probe is
attached.
The ISFET probe is not sensed
by the meter or the probe.
Set the meter power to off. If the
"ISFET" icon does not show, replace
the ISFET probe.
Out of calibration Calibrate the ISFET probe
on page 27.
The probe is not in the solution. Put the probe in liquid. Carefully
shake the probe to make sure that air
bubbles are not caught on the sensor
surface.
No probe is connected to the
meter.
Set the meter power to off. Connect
the pH probe. Set the meter power to
on.
The probe is dirty. Clean the probe.
The probe is damaged. Replace the probe. Contact technical
support.
Screen flashes during calibration. The probe sensor surfaces are
dirty or it is necessary for the
probe to be conditioned again.
Clean and condition the probe again.
No flow in the reference junction Clean the warm buffer.
The buffers are contaminated or
expired.
Calibrate with new buffers again.
Interference from other devices in
the solution
Remove all devices from the solution.
The battery is low. Replace the batteries if the battery
icon shows low battery power.
Interference from direct sunlight Use protection for the probe from
direct sunlight.
The probe is too old. Replace the probe.
Error codes
Table 3 shows the codes that can occur for various reasons. Error codes show instrument
malfunction or user error.
Table 3 Error code descriptions
Error
Code
Description Solution
E02 The ISFET pH probe is damaged. Replace the probe. Contact technical support for probe
replacement information.
E03 Clean the probe. Clean the probe. If the error continues, replace the probe.
E04 Glass pH probe slope error. The
slope is smaller than 85% or larger
than 102% of 59.16 mV per pH unit.
Clean the probe. If the error continues, replace the probe.
E06 ISFET pH probe slope error. Clean the probe. Soak in 40 ºC (113 ºF) pH 7.00 buffer for
2 minutes. Calibrate again. If the error continues, replace the
probe.
E07 Clean the probe. Clean the probe. Make sure that no air bubbles on the sensor
surface or foreign objects or materials on the sensor.
English 29
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