Measuring The Ion Concentration - wtw pH/ION 340i Operating Manual

pH/ION 340i
AutoRead AR
(Drift control)
The temperature measurement is absolutely essential for a reproduc-
ible ISE measurement. If the measurement is made without a temper-
ature sensor, proceed as follows:
1 Measure the current temperature using a thermometer.
2 Bring the test sample and calibration standards to the same
temperature (± 2 °C).
Note
For ISE measurements and ISE calibration, it is not possible to enter
temperature values manually.

4.4.2 Measuring the ion concentration

To perform ion concentration measurements, proceed as follows:
1 Perform the preparatory activities according to section 4.4.1.
2 Immerse the ISE electrode and, if necessary, the temperature
sensor in the test sample.
ISE
UpH
S
1 0 1 5
Time Baud
2
8 0
Day.Month No.
Year Ident
Auto Store
AutoCal DIN
LoBat
AutoCal TEC ConCal
The AutoRead function (drift control) checks the stability of the mea-
surement signal. The stability has a considerable effect on the repro-
ducibility of the measured value.
For identical measurement conditions, the following criteria apply:
Reproducibility
better ± 0.05 mV
mol/L
7
mV/pH
% ppm
mg/L
°F
8
%
TP
°C
CalError TempError
ARng AR RCL
Response time
> 30 seconds
Operation
33