Xylem MULTI 3500i HANDHELD MULTIPARAMETER METERS - Manual (Page 45)

Multi 3500i Operation
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adjust the temperature of the standard and measuring solutions ac-
cordingly. If the temperature difference is greater the [TempErr] warn-
ing appears in the measured value display.
4.5.3 Settings for ISE measurements
Overview The following settings are possible for ISE measurements:
z Calibration record (display)
Settings The settings are made in the measuring menu of the ISE measure-
ment. To open the settings, activate the relevant measuring window in
the measured value display and press the
4.5.4 Calibrating for ISE measurements
Why calibrate? Ion-selective electrodes age and are temperature-dependent. This
changes the slope. As a result, an inexact measured value is displayed.
Calibration determines the current value of the slope of the electrode
and stores it in the instrument.
Thus, you should calibrate before each measurement and at regular in-
tervals.
When to calibrate? z Before any measurement if possible
z After connecting another ISE electrode
z When the sensor symbol flashes, e.g. after a voltage interruption
(empty batteries)
Menu item Possible
setting Description
Calibration / Calibra-
tion record - Displays the calibration
record of the last calibra-
tion.
Man. temperature -20 ... +130 °C Entry of the manually de-
termined temperature. For
measurements without
temperature sensor only.