32
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 Check-
tempC or an accurate thermometer 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 (see page 27).
Note
To toggle between the pH buffer and the tem-
perature 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 perform measurement. However, user
is informed of a pH calibration require-
ment by a blinking “CAL” (see “Startup”
section).
The device must be calibrated within the temperature range
of
0
-
95 °C
. Outside this range, the buffer pH values are
not reliable.
