Measuring Functions; Calibration - wtw Multi 3500i Bedienungsanleitung

Measuring functions

AutoRead
(drift control)
Temperature
measurement in
pH and ISE
measurements
Salt content
correction in
DO measurements
Temperature
compensation and
reference
temperature of
conductivity
measurements
Procedure
AutoRead
(drift control)
Calibration result
22
Measuring functions
The AutoRead function indicates the stability of the measurement signal. It is
active during all measurements. The display of the measured parameter
flashes as long as the specified stability of the measured value is not kept.
When using electrodes without an integrated temperature sensor you can
use the temperature sensor of a DO sensor or a conductivity measuring cell.
The meter recognizes suitable sensors and switches on the temperature
measurement. If the instrument measures the temperature, it is displayed
with a high resolution (0.1 °C); if the temperature is entered manually, it is
displayed with a low resolution (1 °C). The temperature is entered manually
in the measuring menu.
When measuring the concentration of solutions with a salt content of more
than 1 g/l, a salt content correction is required. When using the ConOx double
sensor, you can measure the salinity in the solution simultaneously and
include it in the DO measurement automatically. When the salt content
correction is switched on, the [SAL] indicator appears in the measuring
window. The salt content correction is set in the DO measuring menu.
You can select from the following settings:
Nonlinear temperature compensation [nLF] according to EN 27 888
Linear temperature compensation [lin] with selectable coefficients of
0.000 ... 3.000 %
No temperature compensation
The setting of the temperature compensation and entry of the reference
temperature are carried out in the conductivity measuring menu.

Calibration

Select the required measured parameter with <L> <M> and <M>. Ensure
that the correct calibration procedure is set in the relevant measuring menu
(e.g. buffer sets for pH calibration). Then switch to the measured value
display and press <CAL>. The Multi 3500i guides you through the course of
the calibration step by step.
With automatic calibration, the measured value is only accepted when the
stability criterion is met. This can be terminated prematurely and the current
measured value taken over with <MENU/ENTER> at any time.
When a calibration is finished, the new calibration values are displayed as an
informative message (
to take over these values of the new calibration or whether you want to
continue measuring with the old calibration data. After accepting the new
calibration values the calibration record is displayed.
/
K
i
symbol) first. Then you can decide whether you want
Multi 3500i