Calibrating For Ph Measurements; Autocal Tec; Autocal Din - wtw inoLab pH/Cond Level 1 Operating Manual

Operation
Why calibrate?

AutoCal TEC

AutoCal DIN

ConCal
AutoRead
Calibration
evaluation
90
4.3

Calibrating for pH measurements

pH electrodes age. This changes the asymmetry (zero
point) and slope of the pH electrode. As a result, an inexact
measured value is displayed. Calibration determines the
current values of the asymmetry and slope of the electrode
and they are stored in the instrument.
Thus, you should calibrate at regular intervals.
Note
Always calibrate after connecting another pH electrode.
You can choose between 3 calibration procedures:
is specially adapted to the WTW technical buffer solutions
as a fully automatic two-point calibration. The buffer solu-
tions are automatically recognized by the instrument.
is specially adapted to permanently programmed buffer so-
lutions according to DIN 19266 as a fully automatic two-
point calibration. The buffer solutions are automatically rec-
ognized by the instrument.
is the conventional two-point calibration with 2 freely
selectable buffer solutions or single-point calibration as the
rapid method.
In calibration using AutoCal TEC and AutoCal DIN, the Au-
toRead function is automatically activated.
The current AutoRead measurement (with acceptance of
the current value) can be terminated at any time by pressing
g
.
After the calibration, the instrument automatically evaluates
the current status. The asymmetry and slope are separately
evaluated. The worst evaluation appears on the display.