Thermo orion 135A, Instruction Manual

Page: 20 / 56

Note
cal
Operation 14
Calibration with any calibration solution (AutCAL ON)
Impurities must always be prevented from getting into the
calibration solutions.
Pressing the
cal
key activates calibration.
Calibration can be exited again with the
meas
key. Then
the cell constant of the last calibration is displayed briefly.
First confirm any of the 0.1 or 0.01 mol/l KCl solutions
(CALSoL) with the
cal
key.
Immerse the clean and dry sensor in the calibration solu-
tion (also see “Clean sensors” Pg. 11).
Press the
cal
key to start calibration. If calibration is not
desired, cancel the process with the
meas
key.
During calibration the lower line indicates the temperature.
The automatic drift check checks the stability of conductiv-
ity and temperature. The hour glass flashes.
When the measured values are stable, the temperature-
compensated table value of the KCl solution is displayed.
The measured conductivity value flashes.
See the table of your calibration solution for the conductiv-
ity value which belongs to the displayed measuring tem-
perature.
Set the temperature-compensated conductivity in the me-
ter with the
Y
and
B
keys, then confirm it with the
cal
key.
The determined cell constant is displayed for a few se-
conds. Then the meter switches back into the measuring
mode.