6.5.1 Input and determination
of temperature coefficient
Matrix fields V1 / H1 and V1 / H2,
level 1 (operation)
Input of temperature coefficient
(matrix field V1 / H1)
• No temperature compensation has to be
entered for NaCl compensation.
The compensation is non-linear according
to the temperature curve of the conductivity
values of NaCl solutions
(value according to DIN IEC 746, part 3).
The reference temperature is 25 °C.
• For linear temperature compensation
referred to 25 °C or for freely selectable
reference temperature value, the value of
the temperature coefficient is entered in
matrix field V1 / H1.
• If the temperature coefficient is unknown, it
can be determined by measurements.
Select matrixfeld V1 / H2. Then the unit
automatically calculates the temperature
coefficient.
Function Matrix field Note
Temperature
compensation type
V1 / H3 Explanation see chapter 6.6
Reference temperature V1 / H4 With NaCl compensation fixed to 25 °C
Temperature coefficient:
- Input
- Determination
V1 / H1
V1 / H2
With NaCl compensation fixed
Only if temperature coefficient is unknown
Note:
For concentration measurement see chapter 6.5.2 .
Conductivity (uncompensated)
κ
2
T
0
Temperature °C T
1
T
2
κ0
κ
1
BA125062.GEM
Fig. 6.5: Determination of
temperature coefficient
α
T
0
: Reference temperature
(Standard = 25 ° C )
χ
0
: Conductivity value at T
0
χ
1,2
: uncompensated conductivity
value at T
1
, T
2
α
=
(
κ
2
κ
1
−
1
)
⋅
100
(
T
2
−
T
1
)
6. Operation
mycom CLM 121/151 - CD/MM
32
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