Multi 340i
pH calibration
7
pH calibration
AutoCal TEC
This process is specially adapted to the WTW technical buffer solutions as a
fully automatic single or two-point calibration. The buffer solutions are au-
tomatically recognized by the measuring instrument. Depending on the in-
strument setting, the instrument displays the relevant buffer nominal value or
the current electrode voltage in mV.
Valid buffer (values at 25 °C): 2.00 / 4.01 / 7.00 / 10.01
Note
The calibration for pH 10.01 is optimized for the WTW technical buffer solu-
tion TEP 10 Trace or TPL 10 Trace. Other buffer solutions can lead to an er-
roneous calibration. The correct buffer solutions are given in the WTW
catalog or in the Internet.
Calibration
evaluation
After calibrating, the measuring instrument automatically evaluates the cali-
bration. The asymmetry and slope are evaluated separately. The worst eval-
uation appears on the display.
Note
If a printer is connected to the interface, a calibration protocol is automatically
printed after a valid calibration.
Display
Asymmetry[mV]
Slope [mV/pH]
-15 ... +15
-60.5 ... -58
-20 ... +20
-58 ... -57
-25 ... +25
-61 ... -60.5
or
-57 ... -56
Clean the electrode according
to the electrode operating
manual
-30 ... +30
-62 ... -61
or
-56 ... -50
E3
Invalid calibration
< -30 or > 30
< -62 or > -50
