Hanna Instruments HI 8521 - Manual (Page 22)

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• Press the CAL key. The temperature compensated
buffer value will be displayed e.g. if the buffer
temperature is at 25°C, the display will show
pH7.01. If the buffer temperature is at 20°C,
display will show pH 7.03 (see page 23). If
"E4" appears the calibration solution is wrong.
• Wait until the pH symbol stops flashing: that
means the reading is stable.
• Press the CON key. The symbol "E5" will appear
to indicate that the electrode is still in pH 7.01
buffer, but expecting a pH 4.01 or 10.01 buffer.
• Rinse the electrode and temperature probe be-
fore immersing them into pH 4.01 / pH 10.01 calibration buffer,
shake briefly and wait for thermal equilibrium.
• The symbol "E5" should disappear and the temperature compen-
sated buffer value is flashing.
• Wait until the pH symbol stops flashing, press the CON key to
confirm the calibration.
• The pH calibration is now complete.
CALIBRATION WITH MANUAL TEMPERATURE COMPEN-
SATION FOR HI8417, HI8520 AND HI8521 ONLY)
If for some reason the temperature probe is defective, or it is required
to calibrate with manual temperature compensation, follow the proce-
dure below:
• Unplug the temperature probe from the
meter.
• Note the temperature of the buffer with a
ChecktempC or a glass thermometer.
• Use the UP and DOWN arrow keys to
set the temperature to the noted tem-
perature.
• Follow the calibration procedure as for
pH calibration with temperature probe
connected (see page 18 for HI8417 or
page 21 for HI8520/HI8521).
°C
°C
ºC
CAL
CON
pH