Measuring The Ph Value - wtw Multi 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
1 6 9 9
Time Baud
2
8 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 or Cond) and immerse it in
the same sample. TP flashes, the temperature is automati-
cally 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 < > < >.
2 Activate the AutoRead function with <AR>.
The current measured value is frozen (hold function).
Sal
mV/pH
% mg/l
S/
m
cm
mbar M cm
1/ cm Sal
8
°
C
/
% K
TP
° F
Auto Store
ARng
AR RCL
Response time
> 30 seconds
Multi 340i