Genral Water Catalogue - Crison Instruments - #49

There are various types of cell on the market:

- With two electrodes. This is the traditional system.

- With four electrodes. Used in dirty media with high conductivity levels.

- Induction. Used with very high conductivity and in highly-corrosive media.

The type of conductivity meter the user possesses will

determine the type of cell he/she will use.

CRISON offers different models of two-electrode cell.

The CRISON cells shown in this catalogue have a built-in Pt 1000 temperature sensor, which means that conductivity and temperature can be measured simultaneously, thus allowing automatic correction of the effect that temperature will have on the conductivity of the sample.

Formerly, the cell constant was the parameter which characterised the cell. Depending on the constant, the scale of measurement of the cell would differ. Nowadays, the cell and the conductivity meter together set the scale of measurement. As such, both the geometry of the cells and the electronic components of the instruments are optimised to cover the scale of measurement required.

When the optimal scale of measurement of a cell is expressed, it always refers to a specific conductivity meter, so the behaviour of that same cell with other instruments cannot be guaranteed. When it comes to choosing a cell, the user should select depending on:

- type of installation

- scale of measurement, always thinking with which conductivity meter it is to be used.

CRISON manufactures two models of cell, depending on the type of installation.

With two metal electrodes. The cell

is usually displayed as two 1 cm² metal plateswith a 1 cm separation between them. This is equivalent to a 1 cm^-1 constant.

These days, the number, shape, material and size of the plates vary, but with a single aim: to improve measurement, i.e. the conductivity meter and the cell together display a wide-ranging scale of measurementwith a high degree of precision.