Ph Calibration - wtw Multi 340i Mode D'emploi

Multi 340i
AutoCal TEC
Calibration
evaluation

pH calibration

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.
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.
Display
Clean the electrode according
to the electrode operating
manual
E3
Invalid calibration
Note
If a printer is connected to the interface, a calibration protocol is automatically
printed after a valid calibration.
Asymmetry[mV]
-15 ... +15
-20 ... +20
-25 ... +25
-30 ... +30
< -30 or > 30
pH calibration
Slope [mV/pH]
-60.5 ... -58
-58 ... -57
-61 ... -60.5
or
-57 ... -56
-62 ... -61
or
-56 ... -50
< -62 or > -50
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