pH 1970i
Operation
23
ba75690e01
01/2007
Preparatory activities
4.3.1
AutoCal TEC
For this procedure, use any two or three WTW technical buffer solu-
tions in ascending or descending order
(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 4.6 C
ONFIGURATION
), the instrument displays the relevant buff-
er nominal value or the current electrode voltage in mV.
Note
Skip the steps 2, 7 and 14 if you use a temperature sensor.
1
Switch on the measuring instrument with
<ON/OFF>
.
2
Connect the pH electrode to the measuring instrument.
3
Keep the buffer solutions ready.
4
Adjust the temperature of the solutions and measure the cur-
rent temperature if the measurement is made without temper-
ature sensor.
1
Press the
<CAL>
key repeatedly until the
Ct1
display indicator
and the
Auto Cal TEC
function display appear. The sensor
symbol displays the evaluation of the last calibration (or no
sensor symbol in the delivery state or after the measuring pa-
rameters have been reset).
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
