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EC Electrode Selection

The choice of the correct conductivity cell is important to be able to perform correct measurements. Each cell has certain specific properties that determine which values can be measured the best.

The cell with a constant of 1 cm-1 is mostly for general use.

A cell with a constant of 0.1 cm-1 is best for measurements of very low values such as pure, distilled or demineralised water, low-ionic solutions.

A cell with a constant of 10 cm-1 is best for measurements of high values such as brine, saline solutions, strong acids, …

The glass cells with a constant of 1 and 10 have Platinum measurement plates which are covered with Platinum black. This layer of Platinum black serves to reach higher measurement values. It is also susceptible to modification of the capabilities of the cell when the layer is touched mechanically. The glass cells provide the best results over the widest measurement range.

Epoxy cells with graphite measurement plates are mostly more limited in use of range and for use in organic solutions: check the chemical compatibility of the epoxy with the solution and with possible required cleaning solvents.

The standard electrodes can be obtained with or without integrated temperature compensator (ATC).

Mind also that we have 2 pole and 4 pole conductivity cells. The 4 pole cells are for use with only a limited range of devices.

Measurement ranges

The choice of the cell constant also determines the measurement ranges of the instrument. Each range is multiplied with the value of the cell constant. This results e.g. for a device of:

The C3000, C6000 and R3600 ranges:

CCLowest Highest
1,0cm-10,00-20,00_µS/cm0,0-200,0_µS/cm0-2000_µS/cm0,00-20,00_mS/cm0,0-200,0_mS/cm
0,1cm-10,000-2,000_µS/cm0,00-20,00_µS/cm0,0-200,0_µS/cm0-2000_µS/cm0,00-20,00_mS/cm
10cm-10,0-200,0_µS/cm0-2000_µS/cm0,00-20,00_mS/cm0,0-200,0_mS/cm0-2000_mS/cm

The C1000 and C5000 ranges (only C1020 and C5020 accept also 0.1 and 1.0 cell constants!):

CCLowest Highest
1,0cm-10,0-100,0_µS/cm0-1000_µS/cm0,00-10,00_mS/cm0,0-100,0_mS/cm
0,1cm-10,00-10,00_µS/cm0,0-100,0_µS/cm0-1000_µS/cm0,00-10,00_mS/cm
10cm-10-1000_µS/cm0,00-10,00_mS/cm0,0-100,0_mS/cm0-1000_mS/cm

2 Pole EC Electrodes Selection table

EC Electrodes without built-in ATC

Code CC1) Body2) Range Type Applications3) Picture Device4)
SK10B1,0 cm-1EpoxyLimited
(<10 mS/cm)
GraphiteRegular use
Environmental/
Drinking/
Waste water
electrode_sk10t.jpgC10xx
C5010
C5020
C60xx
C3xxx
SK20B1,0 cm-1GlassRegular
to high
(<100 mS/cm)
PlatinumRegular use
Brackish/
Ocean/Sea water
electrode_sk20.jpgC10xx
C5010
C5020
C60xx
C3xxx

EC Electrodes with built-in ATC

Code CC5) Body6) Range Type Applications7) Picture Device8)
SK10T1,0 cm-1EpoxyLimited
(<10 mS/cm)
GraphiteRegular use
Environmental/
Drinking/
Waste water
electrode_sk10t.jpgC10xx
C5010
C5020
C60xx
C3xxx
SK12T0,1 cm-1EpoxyLow
(<2 mS/cm)
GraphiteDistilled/
Demineralised/
Deionised/
Mountain water
electrode_sk10t.jpgC1020
C5020
C60xx
C3xxx
SK20T1,0 cm-1GlassRegular
to high
(<100 mS/cm)
PlatinumRegular use
Brackish/
Ocean/Sea water
electrode_sk20.jpgC10xx
C5010
C5020
C60xx
C3xxx
SK21T0,1 cm-1GlassLow
(<2 mS/cm)
PlatinumDeionised/
Distilled/
Demineralised/
Pure water/
Low Ionic Solution
electrode_sk21.jpgC1020
C5020
C60xx
C3xxx
SK23T10,0 cm-1GlassRegular
to very high
(up to 1000 mS/cm)
PlatinumBrine
high ionic
strength
electrode_sk23.jpgC1020
C5020
C60xx
C3xxx

4 Pole EC Electrodes Selection table (built-in ATC)

Code CC9) Body10) Range Type Applications11) Picture Device12)
SK40T 0,6 cm-1 Epoxy Regular
to very high
GraphiteRegular use
Brine
Industrial
process water
C34xx
K912
SK41T 1,0 cm-1 Glass Regular
to very high
PlatinumBrine,
high ionic
strength
(Acid, Base)
elektrode_sk41t.jpg C34xx
K912
SK43T 10,0 cm-1 Glass Regular
to very high
PlatinumBrine,
high ionic
strength
(Acid, Base)
elektrode_sk41t.jpg C34xx
1) , 5) , 9)
Cell Constant. This is a typical value for the cell. The correct value needs to be obtained by calibration of the system.
2) , 6) , 10)
Check the chemical compatibility of the electrode body with the measurement solution!
3) , 7) , 11)
The use of the cells are not limited to the given applications here!
4) , 8) , 12)
xx, xxx → full range of the devices
ec_electrodes_selection.txt · Last modified: 24/10/2019 07:35 by pieter