Manual
Multi 1970i Operation
41
Calibration evaluation After the calibration, the measuring instrument automatically evaluates
the current status of the calibration. The evaluation appears on the dis-
play.
Determining the
cell constant
You can determine the cell constant (conductivity measuring cell
TetraCon 325) as follows:
Display Cell constant [cm
-1
]
0.450 ... 0.500 cm
-1
E3
Perform error elimination ac-
cording to chapter 6 W
HAT TO DO
IF...
Outside the range
0.450 ... 0.500 cm
-1
1 Press the <CAL> key repeatedly until the status display
CAL appears.
2 Press the <RUN/ENTER> key. The CAL display appears, as
well as
– the current, calibrated cell constant (with sensor symbol on
the display) or
– the fixed cell constant 0.475 1/cm (without sensor symbol
on the display). In this case, the measurement parameters
are initialized. See “Reset” on page 62..
3 Immerse the conductivity measuring cell in the control standard
solution, 0.01 mol/l KCI.
TPTP
AR
TEC
Auto
°
C
pH
°
C
/pH
m
cm
S/
%
mg/l
mV
pH
AR
ARng
TEC
Auto
mV
S
/
1
Sal
O
LoBat nLF
Lin
Oxi
Tref20
ARng
Time
Year
Ident
No.
Day.Month
Baud
Sal
K
/
%
RCL
REL2
pH
m
cm
S/
%
mg/l
4 7 5
REL1
1
Sal
O
S
LoBat nLF
Lin
Oxi
Tref20
Time
Year
Ident
No.
Day.Month
Baud
Sal
K
/
%
RCL
REL2
L
REL1
CAL
Tref25
Cal
0 4 7 2
AC
cm
1/
0
Tref25
Cal
cm
1/