testo 230 Bedienungsanleitung Seite 41

2 point calibration
The instrument now asks for the first buffer.
Select the buffer required with the arrow key ( )
and start the calibration procedure with SELECT.
The following solutions can be used:
pH 1.68 DIN/NBS; 2.00; 4.00; 4.008* DIN/NBS;
6.865* DIN/NBS; 7.00; 9.18DIN/NBS; 10.00
"CAL" flashes during calibration (the calibration
lasts for min. 20 sec. and max.10 min.). A signal
sounds the end of the calibration procedure.
Should the calibration procedure end abruptly
after max. 10 minutes, the electrode is probably
faulty. Please contact our service department.
Once this procedure is completed the electrode is
rinsed in water, dried and then placed in the
B B
second buffer solution (B).
Should the required buffer not correspond with
the set value, reset the value with the arrow
key ( ).
Start the calibration procedure with SELECT.
*Values displayed: 4.01 DIN/NBS; 6.87 DIN/NBS
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