Measuring The Ph Value; Measuring The Temperature - wtw VARIO Operating Manual

Operation
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4.3.2 Measuring the pH value

1 Make sure the measuring system has a valid calibration (see section
4.4).
2 Immerse the electrode in the test sample.
The display shows the main measured value (pH or mV) and
temperature value. When operating an electrode without temperature
sensor on the adapter, the manually entered temperature value is
displayed (see section 4.3.3).
The unit of the measured value display flashes (AutoRead) as long
as the measured value is not stable.
RESET
CAL
LAP
MEM
8 7 0 0 mV
pH
C
8 2 5 0
Lap
LoBat Day.Month h:min min:s Ident
ESC
CLR
3 If necessary, switch the display between pH and mV with <"_>
[<Measured value>].
4 Wait for a stable measured value.
As soon as the measured value is stable, the unit of the measured
parameter (pH or mV) no longer flashes.

4.3.3 Measuring the temperature

For reproducible pH measurements, it is essential to measure the
temperature of the measuring solution.
You have the following possibilities of measuring the temperature:
! Automatic measurement of the temperature by a temperature sensor
integrated in the sensor module or electrode. All short pH electrodes
contain a temperature sensor.
! An NTC30 external temperature probe (accessory) measures the
temperature automatically (see section 3.4.2). This method is possible
with electrodes without an integrated temperature sensor. When
measuring with a short pH electrode no external temperature probe may
be connected.
! Measuring and entering the temperature manually.
<"_>
LoBat Day.Month
VARIO pH
RESET
CAL
LAP
MEM
8 0 0 0 mV
pH
C
8 2 5 0
Lap
h:min min:s Ident
ESC
CLR
ba75373e03 05/2005