21
Trouble calibrating.
Display does not stop
flashing during
calibration.
Probe sensor surfaces are
dirty or probe needs
reconditioning.
Follow cleaning and
reconditioning instructions.
Reference junction not
flowing.
Follow warm buffer cleaning
procedure.
Buffers may be
contaminated or expired.
Recalibrate with fresh
buffers.
Interference from other
devices in solution.
Such as improperly
grounded stirrers, water
baths, or other devices.
Remove any other devices
from solution. Unplug water
baths, stirrers, or any other
electrical devices near the
probe.
Battery is low.
Use AC adapter or replace
battery if
BATT
icon is
displayed.
Interference from direct
sunlight.
Shield probe from sunlight.
If trouble persists, probe
may have reached the
end of its useful life and
may need to be replaced.
Replace probe.
Meter continually
displays 14.00 or
0.00 with electrode
attached.
Presence of ISFET probe
not detected by meter or
probe
If using an ISFET probe, be
sure that the
PROBE
icon is
displayed. If not displayed,
turn off the meter, disconnect,
and then reconnect the probe.
Be sure to listen for an
audible click as the connector
snaps into place. Turn on the
meter. If
PROBE
is not
displayed, replace ISFET
probe.
Out of calibration.
Carefully follow two point
calibration instructions.
Probe not in solution.
Place probe in liquid. Gently
shake probe to be sure no air
bubbles are trapped on the
sensor surface.
No probe attached.
Turn off meter. Attach pH
probe. Turn on meter.
Dirty probe.
Follow cleaning instructions.
Damaged probe.
If problem persists, replace
probe.
Summary of Contents for IQ150
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