Autoread Ar (Drift Control) And Hold Function - wtw Oxi 197i Operating Manual

Oxi 197i
Criteria

4.2.5 AutoRead AR (drift control) and hold function

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. With the aid of the hold function the
measured value display is frozen.
With identical measurement conditions, the following criteria are valid
for the AutoRead function:
Measuring mode
D. O. concentra-
tion
D. O. saturation
index
Use the AutoRead function and hold function like this with the sensors
l Oxygen depth armature
l CellOx 325
l DurOx 325
Note
The special features of the self-stirring D. O. sensor StirrOx G can be
found in section 4.2.6 on page 20.
1 Select the measuring mode with <M>.
2 Activate the AutoRead function with <AR>. The current mea-
sured value is frozen (hold function).
3 Start AutoRead with <RUN/ENTER>.
AR flashes until a stable measured value is reached.
pH S
1 7 0 8
O
Sal
Time Baud
8 1 7 6
Day.Month No.
Year Ident
Tref25 Tref20 Auto Store
LoBat nLF Lin Oxi Cal TEC
4 If necessary, start the next AutoRead measurement with
<RUN/ENTER>.
Reproducibility
better than 0.05 mg/l
better than 0.6 %
mV / pH
%
mg/l
S/
m
cm
1/ cm Sal
C
°
/
% K
TP
REL1 REL2
ARng AR RCL
Operation
Response time
> 10 seconds
> 10 seconds
19