wtw Multi 197i Operating Manual page 24

Operation
AutoCal TEC
Starting the calibration
24
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
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.
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).
pH S
1 C T 1
O
Sal
Time Baud 8 2 4 8
Day.Month No.
Year Ident
Tref25 Tref20 Auto Store
LoBat nLF Lin Oxi Cal TEC
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:
), the instrument displays the relevant buf-
mV / pH
% mg/l
S/
m
cm
1/ Sal
cm
C
°
/
K
%
TP
REL1 REL2
ARng AR RCL
Multi 197i
ba75339e04 07/2009