INTRODUCTION
IMPORTANT NOTICE
IF THE METER IS USED IN A MANNER OTHER THAN AS
DESCRIBED, THE SAFETY AND PERFORMANCE OF THE METER
CAN BE IMPAIRED.
IF THE SEAL ON THE BACK OF THE METER IS TAMPERED
WITH, THE WARRANTY IS IMMEDIATELY VOIDED.
The IQ150 pH “Dual Technology” meter accepts both traditional style glass
sensor electrodes with BNC connectors as well as non-glass pH probes with
ISFET (Ion Sensitive Field Effect Transistor) silicon chip sensors.
Throughout this manual, non-glass pH probes with silicon chip sensors will be
referred to as “ISFET” probes. The meter has a standard BNC connector for
attachment of glass sensor pH electrodes. Glass sensor pH electrodes will be
referred to as “BNC” probes.
The meter is designed to use only one electrode at a time. The meter
automatically identifies which type of electrode is attached when the meter is
turned on. If both ISFET and BNC probes are attached at the same time,
errors may occur. Always turn off the meter when changing electrodes
ESTIMATED LIFE OF AN ISFET SENSOR pH PROBE
Depending upon the application, the expected life of an ISFET probe is
approximately 18 months. The reference electrode contains a KCl gel, which
becomes increasingly diluted with usage and time. The reference is sealed
and is not refillable. When it becomes difficult to calibrate (pH buffer value
does not stop flashing during calibration or takes an excessively long time to
stop flashing), the probe should be replaced. A probe that is dirty,
miscalibrated, or has reached the end of its useful life will give an error
message E06 or E07 on the meter display. Your ISFET probe is warranted to
be free from manufacturing defects for six (6) months from the date of
purchase.
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