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9
RELATIVE mV MEASUREMENTS
• Press RANGE until “rEL” message will be displayed on the secondary LCD line
for about one second and “mV” tag will blink. After one second the
temperature will be displayed on the secondary LCD.
The reading displayed by the instrument is equal to the difference between
the current mV input value and relative mV offset established in the relative
mV calibration.
ION MEASUREMENTS
• Press RANGE to enter ppm measurement mode.
• Submerge the tip of the ISE electrode 4 cm (1½”) into the sample to be
tested and allow a few seconds for the reading to stabilize.
• The instrument displays the ppm reading on the primary LCD and the
temperature on the secondary LCD line.
TEMPERATURE MEASUREMENTS
Connect the HI 7669/2W temperature probe to the appropriate
socket and turn the instrument on.
Immerse the temperature probe into the sample and allow
the reading on the secondary LCD to stabilize.
mV
C
C
ppm