Operation Multi 340i
18
4.2.2 Measuring the pH value
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 Press the <▲> <▼> keys until pH appears in the status display.
The pH value appears on the display.
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.
Tref20
Lin
Cal
8
1
S
SalOU
%
mg/l
mV/pH
1/
cm
Sal
AutoCal DIN
Tref25
nLF
AutoCalTEC
RCL
Auto
Store
LoBat
ARng
AR
Time
Baud
Day.Month No.
Ident
Year
mbar
TDS
cm
M
°
F
/
K
%
S/
m
cm
8
4
2
9
9
6
°
C
TP
pH
Reproducibility Response time
Better than 0.02 > 30 seconds
1 Call up the pH measuring mode with <▲> <▼>.
2 Activate the AutoRead function with <AR>.
The current measured value is frozen (hold function).
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