5
GENERAL DESCRIPTION
The
HI98190
and
HI98191
instruments are state‑of‑the‑art, heavy‑duty pH meters, designed to
provide laboratory results and accuracy under harsh industrial conditions.
They are provided with a series of new diagnostic features which add an entirely new dimension
to the measurement of pH, by allowing the user to dramatically improve the reliability of the
measurement:
• seven standard buffers (pH 1.68, 4.01, 6.86, 7.01, 9.18, 10.01 and 12.45) for calibration.
• pH calibration up to five calibration points (see instrument specifications).
• Custom calibration with up to five custom buffers.
• Messages on the graphic LCD for an easy and accurate calibration.
• Cal Check™ Diagnostic features to alert the user when the electrode needs cleaning.
• Optional user enabled “Outside Calibration Range” warning.
• Monitoring of the electrode aging.
• User selectable “Calibration Time Out” to remind when a new calibration is necessary.
Moreover, they offer an extended temperature range from ‑20 to 120 °C (‑4 to 248 °F), using a
temperature sensor inside pH electrode.
These instruments can also measure with ORP electrodes, thanks to their capability to measure mV
with a resolution up to 0.1 mV.
HI98191
can also measure with ISE electrodes. The electrode type unit selection capability and the
ISE calibration in up to five calibration standard solutions make this instrument very useful for a
large range of concentration solutions measurements.
Other features include:
• Relative mV measurements
• Log on demand up to 300 samples for
HI98191
and 200 samples for
HI98190
(100 samples on each range ‑ pH, mV, ISE only
HI98191
)
• Auto Hold feature, to freeze first stable reading on the LCD
• GLP feature, to view last calibration data for pH, Rel mV, or ISE
• PC interface
