testo 252 Bedienungsanleitung Seite 84

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With reference to the selected pH calibration (pH1
or pH2) the calibration data from the pH electrodes
can be set to theoretically possible standard values
(S = 58 mV/pH at 25 ° C and AS = 0 mV). The
query does not appear if "no pH" was selected.
This enables you to carry out a measurement e.g.
even after unsuccessful calibration or should you
not have a buffer solution for calibration. Measuring
errors to max. one pH unit are, however, possible.
Select the conductivity probes which you are going
to use for the next measurement.
Type A
2 and 4 pin
conductivity meas. cells, low
resolution (c.f. p. 59)
Type B
2 and 4 pin
conductivity measuring cells,
high resolution (c.f. p. 59)
no Cond
blocks the conductivity
measurement and simplifies
the handling as a pH/mV/°C
measuring instrument. This
setting is recommended for measu-
ring pH or redox only.
trEF = reference temperature. Standard setting:
25 °C. 20 °C and 18 °C can be selected. Using the
set temperature coefficients (tC) the instrument
calculates the measured conductivity according to
the selected reference temperature. If the value of
the reference temperature is changed the
instrument is automatically adapted to the
temperature coefficients. If measurements are to
be carried out with the setting nW (natural water)
trEF = 25°C must be set. trEF can no longer be
adjusted if the temperature coefficient tC is set to
nW. c.f. P. 36 "Preparing a conductivity
measurement .
A segment test and display of the battery voltage
follows the confirmation of the last setting. The
instrument then enters the measuring mode. The
instrument is now ready for operation, in
accordance with your settings.
User Instructions
Configuration menu