Operation
Multi 197i
24
ba75339e04
07/2009
AutoCal TEC
For this procedure, use any two WTW technical buffer solutions (pH
values at 25 °C: 2.00 / 4.01 / 7.00 / 10.01).
Note
The calibration for pH 10.01 is optimized for the WTW technical buffer
solution TEP 10 Trace or TPL 10 Trace. Other buffer solutions can lead
to an erroneous calibration. The correct buffer solutions are given in the
WTW catalog or in the Internet.
Note
The buffer solutions are automatically recognized by the measuring in-
strument. Depending on the instrument setting (see
section 4.9 C
ONFIGURATION
), the instrument displays the relevant buf-
fer nominal value or the current electrode voltage in mV.
Note
Skip the steps 2 and 7 if you use a pH electrode with temperature sen-
sor or the temperature sensor of a conductivity measuring cell or a D.
O. sensor.
Starting the calibration
1
Press the
<CAL>
key. The
Ct1
display and the function display
AutoCal TEC
appears. The sensor symbol displays the evalu-
ation of the last calibration (or no sensor symbol in the delivery
state or after the measurement parameters have been reset).
2
If required, enter the temperature of the first buffer solution with
<
▲
> <
▼
>
while keeping the
<RUN/ENTER>
key depressed.
3
Immerse the pH electrode in the first buffer solution.
4
Press the
<RUN/ENTER>
key.
The
AR
display indicator flashes.
The electrode voltage (mV) or the buffer nominal value ap-
pears on the display. Example:
Store
AR
1
LoBat
nLF
Lin
Oxi
Tref25
Tref20
ARng
8
Time
Year
Ident
No.
Day.Month
Baud
Sal
cm
1/
K
/
%
RCL
REL2
pH
/
mV
m
cm
S/
%
mg/ l
Sal
O
S
pH
C
2 4 8
T 1
°
C
TP
REL1
Cal
TEC
Auto