Hanna Instruments HI 121 - Manual (Page 14)

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Note: Press or from the left keypad to toggle between temperature
and absolute mV reading on the secondary LCD.
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.
ION MEASUREMENTS
To measure Ion concentration, an independent input channel is provided.
• Press CHANNEL or simply ISE from the left keyboard
to select ISE channel.
• 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 instruments display the ppm reading on the primary LCD and the
temperature on the secondary LCD.
Note: To view the mV or Rel mV reading on the ISE channel, press MODE
or simply mV/RelmV keys from the left keyboard.
TEMPERATURE MEASUREMENTS
Connect the HI 7662-T temperature probe to the appropri-
ate socket. Immerse the temperature probe into the sample
and allow the reading on the secondary LCD to stabilize.
Notes: • The temperature can be displayed in Celsius degrees (ºC) or in
Fahrenheit degrees (ºF) (see SETUP for details, page 30).
• Make sure that the temperature probe is in the same sample
that is measured (pH or ISE).