40
CALIBRATION WITH MANUAL TEMPERATURE COMPENSATION
• Enter the calibration procedure and press LCD to display
the temperature on the secondary LCD.
• Unplug any temperature probe that
may be attached to the meter. The
“°C” symbol will flash.
• Note the temperature of the buffer
solutions with a ChecktempC or another accurate ther-
mometer with a resolution of 0.1 °C.
• Use
or
to manually adjust the display reading to the
value of the reference thermometer (e.g. 20 °C).
•
Follow the calibration procedure above.
Note
To toggle between the pH buffer and the
temperature press LCD.
When a one-point calibration is carried out only the pH
offset is computed and stored, while the pH slope is fixed
according to the theoretical values.
With a two-point calibration, offset and slope are computed
to fit the two calibration points. With a three-point calibra-
tion the offset and first slope values refers to pH4.01 and
7.01 buffers, while the second slope refers to pH7.01 and
10.01 buffers.
Note
If the process meter has never been
calibrated or an EEPROM reset has
occurred, the meter continues to per-
form measurement. However, the user
is informed of a pH calibration requirement by a blinking
“CAL” (see “Start-up” section).
The device must be calibrated within the temperature range
of
0
-
95 °C
. Outside this range, the buffer pH values are
not reliable.
