C a l – Xylem MULTI 1970I PORTABLE MULTIPARAMETER METERS User Manual
Page 43
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
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.
TP
TP
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
C A L
Tref25
Cal
0 4 7 2
A
C
cm
1/
0
Tref25
Cal
cm
1/