5. Set-up
Connect the electrode, switch on the device with the button.
After the segment test,
he device briefly shows information about its configuration:
(e.g.
if a zero point or slope correction of the temperature sensor was made (see
chapter 10. Configuration of the device)).
The device is now ready for measurement:
6. Measurement principles
6.1 Conductivity principles
Definition of conductivity γ:
The ability of a material to conduct electrical current:
l
(R•A)
Where
l: Length of the material
A: Cross-section
R: Measured resistance
Siemens S mS (µS)
Comment
1. The conductivity is the reciprocal value of the specific resistance.
2. The conductance is the reciprocal value of the measured resistance R.
3. The cell constant is the ratio of the electrode surface to its distance.
It has the measurement cm
-1
.
6.2 Measurement ranges and cell constants
Various measurement ranges can be realised depending on the selected electrode. There are
4 cell constant ranges which can be adjusted for the various electrodes in the device. These
depend on the corresponding cell constant K:
CELL rAnG
(Cell constant
range)
Adjustable
cell constant K
Examples for applications
0.01 0.004000 - 0.015000•1/cm Purest water, electrodes with K = 0.01
0.1 0.04000 - 0.15000•1/cm Purest water, electrodes with K = 0.1
1 0.4000 - 1.5000•1/cm
Standard electrode in the contents of delivery, e.g.
SET1 K = 0.55
SET2 K = 0.40
10 4.000 - 15.000 •1/cm Electrodes with K = 10 (for extremely high
conductivities)
The cell constant K can be manually entered during configuration (see chapter 7 "Configuration
of the device") or determined with the calibration function. There are therefore two possibilities:
- automatic with reference solutions (temperature compensation)
- adjustment of the displayed value for known solution
γ =
Unit: [γ] = =
metre
m
, common for liquids h:
and
cm cm
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