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O NE-PO IN T
CALIBRATIO N
O N E-PO IN T
CALIBRATIO N
O NE-PO IN T
CALIBRATIO N
O N E-PO IN T
CALIBRATIO N
O N E-PO IN T
CALIBRATIO N
For optimum accuracy it is always recommended to perform a two-point calibration, but
for a faster operation it is also possible to carry out a single-point calibration. Buffers at pH
7.01 or pH 6.86 (NIST) are normally the most appropriate for this purpose, even though the
instrument can be calibrated with any of the memorized pH buffers.
After calibrating the first point (see above), press the CAL key to end the calibration
procedure.
EXPIRED
CALIBRATIO N
EXPIRED
CALIBRATIO N
EXPIRED
CALIBRATIO N
EXPIRED
CALIBRATIO N
EXPIRED
CALIBRATIO N
The instrument is provided with a real time clock (RTC), in order to monitor the time
elapsed since the last pH calibration.
The real time clock is reset every time the instrument is calibrated and the “expired
calibration” status is triggered when the meter detects a calibration time out. The “CAL”
tag will start blinking to warn the user that the instrument should be recalibrated.
The calibration time out can be set (see SETUP menu for details, page 14) from
0 (function disabled) to 14 days.
For example, if a 4 days time out has been selected, the instrument will issue the alarm
exactly 4 days after the last calibration.
However, if at any moment the expiration value is changed (i.e. to 7 days), then the
alarm will be immediately recalculated and will appear 7 days after the last calibration.
Notes
Notes
Notes
Notes
Notes:
• When the instrument is not calibrated or calibration is cleared (default values loaded) there
is no “expired calibration”, and the display always shows a blinking “CAL” tag.
• When an abnormal condition in the RTC is detected, the instrument forces the
“expired calibration” status.
