Calibration - wtw pH 1970i Mode D'emploi

pH 1970i
AutoCal TEC
AutoCal DIN
ConCal

Calibration

evaluation
Display
Asymmetry
[mV]
Slope
[mV/pH]
ba75675e03 05/2012
Calibration
This process is specially adapted to the WTW technical buffer solutions as a
fully automatic single, two-point or three-point calibration. The buffer
solutions are automatically recognized by the measuring instrument.
Depending on the instrument setting, the instrument displays the relevant
buffer nominal value or the current electrode voltage in mV.
Valid buffers (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
solution TEP 10 Trace or TPL 10 Trace. Other buffer solutions can lead to an
erroneous calibration. The correct buffer solutions are given in the WTW
catalog or in the Internet.
as AutoCal TEC, but matched to buffer solutions according to DIN 19266.
Valid buffers (values at 25 °C): 1.679 / 4.006 / 6.865 / 9.180
is the conventional two-point calibration using two buffer solutions
(pH 7.0 ± 0.5 and any other buffer solution) or a single-point calibration
using any buffer solution as a high-speed method.
After calibrating, the measuring instrument automatically evaluates the
calibration. The asymmetry and slope are evaluated separately. The worst
evaluation appears on the display.
-15 ... +15 -20 ... +20
-60.5 ... -58 -58 ... -57
Note
If a printer is connected to the interface, a calibration protocol is automatically
printed after a valid calibration.
-25 ... +25 -30 ... +30
-61 ... -60.5 -62 ... -61
or or
-57 ... -56 -56 ... -50
Calibration
E3
Invalid
calibration
< -30 or
> 30
< -62 or
> -50
21