Xylem pH/ION 3400i ION SELECTIVE ELECTRODE ANALYZER - Manual (Page 33)

pH/ 3400i Operation
33
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:
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:
AutoRead AR
(Drift control)
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:
1 Measure the current temperature using a thermometer.
2 Bring the test sample and calibration standards to the same
temperature (± 2 °C).
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.
UpH
mV/pH
mol/L
8
Auto Store TempError
RCL
LoBat
AutoCal DIN CalError
AR AutoCal TEC ConCal
Time Baud
Day.Month No.
Ident Year
1
%
°F
S
% ppm
8 0 2
7 15 0
°C
ISE
mg/L
ARng
TP
Reproducibility Response time
better ± 0.05 mV > 30 seconds