30
Select cal inst and press
ENTER
. If there is any data in the Reader Unit memory, the
message CLEAR ALL MEM? will appear on the display. Press
ENTER
to clear memory or
ESC
to return to the main menu. Once you have entered the calibration menu, use the
arrow
keys to scroll through the menu and select the sensor which you wish to calibrate
by pressing
ENTER
.
If the user mistakenly places the probe into the incorrect solution ie high standard
instead of a low standard the message will appear on the LCD display "CALIBRATION
ERROR RECAL HIGH & LOW". To remove the message recalibrate the sensor correctly.
Note: This does not ensure that the unit is calibrated accurately, but does ensure that a
major mistake or error does not occur.
During calibration, the display shows a D number (“D = ”). These are the raw numbers
from the analogue to digital converter prior to conversion to real units (such as
°C
temperature or mS/cm conductivity or %sat dissolved oxygen, etc). Calibration
coefficients are used to convert the D number to the real units.