Ph Error Messages - Testo 252 Bedienungsanleitung

Print-out of infrared printer:
"pH value out of range"
Short descriptions of the error
messages can be obtained by
printing out measured values on
the infrared printer.
30
Error messages are displayed after a delay of 5
seconds
Error 1
Cause: The pH measuring range of the instru-
ment was exceeded (pH < -2 or pH >
16). As aqueous solutions have, as a
rule, a pH value between pH -2 and 16,
this error message may indicate incorrect cali-
bration.
Error 2
Cause: The temperature measuring range of the
corresponding probe was exceeded.
Error 3
Cause: Certain ambient temperatures are valid
(see page 57) for the Testo buffers (or
DIN) used for calibration, and the actual
ambient temperature was above or below
this value. Observe the different values
on the bottles of the buffer solutions.
Error 4
Cause: The slope S of the electrode is not within
the range -62 to -50 mV/pH (at 25 ° C),
i. e. your electrode is worn and must be
replaced, or you used the wrong buffer
during calibration and therefore the
slope was wrongly calculated (in this
case you can recalculate the slope
through a new calibration).
Error 5
Cause: The electrode's zero point (AS) is
outside the range -60 to +60 mV (in
relation to pH 7), i. e. your electrode is
worn and must be replaced, or you
used the wrong buffer during calibration
and the slope was wrongly calculated (in
this case you can recalculate the slope
through a new calibration).
pH measurement

pH error messages