Calling Up The Calibration Data - Testo 252 Bedienungsanleitung

Calling up the calibration data of the pH
electrodes (CAL data)
The specific calibration data of each calibration are
stored in this menu and can be recalled at any
time. We recommend that you print out or note
these values after each calibration (via logger or
infrared printer).
By comparing the values you can detect faulty
electrodes before beginning a measurement.
The instrument jumps to the "Calibration data"
menu once calibration has been completed.
Should you have interrupted the calibration after
one or two points, press the page key to enter the
"Calibration data" menu.
AS (zero point of electrode), SA
are displayed. SA and Sb can only be distin-
guished from each other after 3 point calibration (
1 point calibration = displacement of the zero
point, slope is given;
straight through two calibration points).
Permissible values (in relation to 25 ° C):
|AS| < 60 mV
-62 mV/pH < S < -50 mV/pH
Optimal values (in relation to 25 ° C):
AS = 0 mV
S = -59.2 mV/pH
*
slope in acidic range ("A" for acid)
**
slope in alcaline range ("B" for base)
Description of probes
pH electrodes
*
and Sb
2 point calibration =
**
(slopes)
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