Built-In Microchip
The built-in microchip stores
sensor type, serial number and calibration information including
date, time, offset, slope, probe condition and buffers used.
This information is automatically retrieved by edge®once
the electrode is plugged in. The ability to transfer information
allows for hot swapping of probes without having to recalibrate.
All pH measurements are performed within the electrode and
transferred digitally to the meter. This overcomes any noise
issues associated with the traditional high impedance analog
measuring system. Electrical noise can be generated from a built
in temperature sensor and while working in a humid environment.
Spherical Glass Tip
The spherical shaped tip design
allows for a wide area of contact with the sample. This permits
a faster electrode response with a higher degree of stability.
The tip uses a glass formulation that has a resistance of
approximately 100 megaohms. This means that measuring conditions
are optimal around ambient temperatures. Use of high or low
temperature glass around ambient temperatures would not be
optimal due to a long response time or a shortened lifespan of
the electrode.
Double Junction Reference
A double junction electrode has an
internal compartment surrounding the reference wire. Silver ions
are present in the electrolyte of the internal compartment,
which houses the Ag/AgCl reference wire; the electrolyte outside
this compartment is silver free. The double junction design
means that virtually no silver from the electrode enters the
sample. This design allows measurement in applications where
silver ions in the sample are undesirable or silver precipitates
on the junction are likely to form.
PEI Electrode Body
The PEI (polyetherimide) electrode
body is suitable for a wide range of applications and excels in
field measurements due to its durability. The shielding around
the spherical glass tip minimizes breakage due to accidental
bumping or dropping of the electrode. The PEI plastic is a high
quality plastic that is chemically resistant to many harsh
chemicals.
Built-In
Temperature Sensor
HI12300
features a built-in thermistor temperature sensor that is in
the tip of the indicating pH electrode. A thermistor
temperature sensor provides for a high accuracy temperature
reading and should be as close as possible to the indicating
pH electrode in order to compensate for the effect that
temperature has on the membrane potential. By having an
accurate reading it is possible to provide an accurate
temperature compensated reading.
