Xylem ProLab 4000 - Manual (Page 148)

Conductivity ProLab 4000
148 ba75646d03 12/2012
10.2.7 Selecting and adjusting the nonlinear
temperature compensation TC nLin1
The nonlinear temperature compensation is carried out according to
the following equation:
The equation includes two temperature coefficients, TC
1
and TC
2
. In
the ProLab 4000 meter, the temperature coefficients TC
1
and TC
2
are
stored for the following test samples:
Suitable temperature coefficients TC
1
and TC
2
for solutions that are not
mentioned here can be taken from tables found in further reading and
then entered in the meter.
X
Tref
= X
T
/ (1 + TC
1
·[T-TRef] + TC
2
·[T-TRef]
2
)
X
T
= Conductivity at temperature T [S/cm]
X
Tref
= Conductivity at reference temperature Tref [S/cm]
TC
1
= Temperature coefficient 1 [1/°C]
TC
2
= Temperature coefficient 2 [1/°C
2
]
T = Temperature [°C]
Tref = Reference temperature [°C]
HCl NaOH NaCl KCl
Concentration c
[mol/l] 1,0 0,67 0,85 0,67
Temperature range
[°C] 0 … 55 0 … 40 0 … 40 0 … 40
Tref [°C] 25 25 25 25
1 Highlight the channel of the conductivity measuring cell in the
measured value display.
2 If necessary, select the measured parameter with .
3 Open the input window for the temperature coefficients with
Calibration / TC calibration / TC nLin1....