Xylem pH/ION 3400i ION SELECTIVE ELECTRODE ANALYZER - Manual (Page 17)

pH/ 3400i Operation
17
4.2.2 Measuring the pH value
Setting the resolution
AutoRead AR
(drift control)
The AutoRead function (drift control) checks the stability of the mea-
surement signal. The stability has a considerable impact on the repro-
ducibility of the measured values.
For identical measurement conditions, the following criteria apply:
1 Perform the preparatory activities according to section 4.2.1.
2 Immerse the pH electrode in the test sample.
3 If required, enter the temperature of the test sample with <
▲>
<
▼> while keeping the key depressed.
4 Press the <
▲> <▼> keys until pH appears in the status display.
The pH value appears on the display.
mV/pH
mol/L
8
Auto Store TempError
RCL
LoBat
AutoCal DIN CalError
ARng AR AutoCal TEC ConCal
Time Baud
Day.Month No.
Ident Year
1
U
%
°F
S
mg/L
% ppm
ISE
8 4 2
2 99 6
°C TP
pH
1 Press the key and hold it down.
2 Press the key. The measured values are displayed with a
high resolution, e.g. pH = 4.012.
3 Press the and key once more.
The measured values are displayed with a low resolution, e.g.
pH = 4.01.
Reproducibility Response time
Better than 0.02 > 30 seconds
1 Call up the pH measuring mode with and <
▲> <▼> .
2 Activate the AutoRead function with .
The current measured value is frozen (hold function).