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The relative mV reading is equal to the difference between the absolute mV input
value and relative mV offset established in the relative mV calibration (see page 18).
ISE MEASUREMENTS (HI 98172 only)
To perform ion concentration measurements, connect an optional ISE electrode
to the instrument and turn it ON.
If necessary, enter the ISE mode by pressing
RANGE
until the display changes to ppm.
Submerge the ISE electrode tip (4cm/1½”) into the
sample to be tested and wait a few seconds for the
reading to stabilize.
The ppm reading will be displayed on the primary LCD
and the current temperature value on the secondary LCD.
The “ATC” (or “MTC”) tag is turned off because ppm
readings are not temperature compensated.
In order to take accurate ISE measurements, make sure that the appropriate ion
charge was set in SETUP menu, according to the ion type that is to be measured
and the instrument was calibrated (see ISE CALIBRATION for details, page 19).
Notes
: • When the reading is out of range, the display will flash the closest
full-scale value.
• The instrument will display “----” on the primary LCD if it is not
calibrated. Perform at least a one-point calibration if the ion charge
is -1, 1, -2, 2 or a two-point calibration for the “undF” option
selected in SETUP menu in order to take ISE measurements.
• If using the pH electrode while in mV mode, the instrument will
measure the mV generated by the pH electrode.
TEMPERATURE MEASUREMENTS
Connect the
HI 7662
temperature probe to the appro-
priate socket. Immerse the temperature probe into the
sample and allow the reading on the secondary LCD to
stabilize.
Note
: The temperature can be displayed in Celsius degrees (ºC) or in Fahrenheit
degrees (ºF) (see SETUP for details, page 25).
BACKLIGHT FEATURE
The instrument is provided with a Backlight feature,
which can be easily toggled on and off through the
keyboard by pressing
LIGHT
.
Note
: The backlight automatically shuts off after a set period (see SETUP
for details, page 25) with no buttons pressed.
LIGHT