Measuring The Ph Value - wtw pH/ION 340i Operating Manual

pH/ION 340i
Setting the resolution
AutoRead AR
(drift control)

4.2.2 Measuring the pH value

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 <RUN/ENTER> key depressed.
4 Press the < > < > keys until pH appears in the status display.
The pH value appears on the display.
ISE U pH
S
1 6 9 9
Time Baud
8 2 4
Day.Month No.
Year Ident
AutoCal DIN Auto Store
LoBat
AutoCal TEC ConCal
1 Press the <RUN/ENTER> key and hold it down.
2 Press the <M> key. The measured values are displayed with a
high resolution, e.g. pH = 4.012.
3 Press the <RUN/ENTER> and <M> key once more.
The measured values are displayed with a low resolution, e.g.
pH = 4.01.
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:
Reproducibility
Better than 0.02
1 Call up the pH measuring mode with <M> and < > < > .
2 Activate the AutoRead function with <AR>.
The current measured value is frozen (hold function).
mol/L
2
mV/pH
% ppm
mg/L
°F
8
%
TP
°C
CalError TempError
ARng AR RCL
Response time
> 30 seconds
Operation
17