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

Operation
AutoRead AR
(drift control)
18

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 Press the < > < > keys until pH appears in the status display.
The pH value appears on the display.
pH
TDS U O
S
6 9 9
1
Time Baud
8 2 4
Day.Month No.
Year Ident
Tref25 Tref20 AutoCal DIN
LoBat nLF
Lin Cal AutoCal TEC
4 When measuring without a connected temperature sensor:
Options:
l Determine the current temperature using a thermometer
and, while keeping the <RUN/ENTER> key depressed, en-
ter this temperature value with < > < >.
l TP display indicator not displayed, socket for the second
probe is free:
Connect the second probe (Oxi) and immerse it in the same
test sample. TP flashes, the temperature is automatically
measured using the second probe.
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).
Sal
mV/pH
% mg/l
m S/
cm
mbar M cm
1/ cm Sal
8
° C
/
% K
TP
° F
Auto Store
ARng
AR RCL
Response time
> 30 seconds
pH/Oxi 340i