Improving Your Conductivity Measurements With Conductivity Sensor

Have you ever measured conductivity and gotten inaccurate results? There might be a number of causes for this. Measurement of conductivity is simple to do on your own. Using a conductivity cell and an appropriate measurement tool, one puts the cell into the sample solution and reads the result. However, various difficulties might skew your res, ults, such as selecting the incorrect Conductivity Sensor, conductivity's temperature dependence, or CO2 uptake.

So many measuring cells – which one to use?

The first and most crucial question is which Conductivity Sensor is best for your application in terms of conductivity measurement. This decision needs careful thought because the measurement range is based on the conductivity cell's cell constant:

• What should I anticipate my sample's conductivity to be?

• Do the conductivities in my samples range widely?

• How many samples do I have at my disposal for measurement?

On the market, there are several varieties of the conductivity measuring cells. Two-electrode cells have the benefit of being more precise at low conductivities and being able to be built within a smaller geometry. On the other hand, other measuring cell types exhibit no polarization-related effects, have a wider linear range, and are less susceptible to contamination.

Determination Of The Cell Constant

Since each conductivity cell has a unique conductivity cell constant, this determination must be made often. The size of the platinum contacts and the separation between the two surfaces both affect the nominal cell constant. The effective cell constant does not perfectly match the ideal cell constant since no Conductivity Sensor is perfect. Thus, the effective cell constant is ascertained empirically by measuring an appropriate standard. Its measured conductivity is compared to the theoretical value.

Temperature dependency of the conductivity

Have you ever wondered why the literature typically refers to conductivity at 20 °C or 25 °C? The justification is that conductivity is very temperature-dependent and will change with temperature. The variance in conductivity levels recorded at various temperatures is about 2%/°C, making comparisons challenging. So please use a thermostated vessel or a temperature correction coefficient while measuring.

What is a temperature compensation coefficient anyway?

A correction factor, the temperature compensation coefficient, will align your measured value at a certain temperature with the specified reference temperature. The temperature adjustment coefficient, however, is not constant across all samples. You may also utilize the capability of recording a temperature compensation function if the linear temperature compensation is not precise enough. There, you will gauge your sample's conductivity at various temperatures before fitting a polynomial function to the data. With the use of this polynomial function, future temperature adjustments will produce findings that are more precise.

In conclusion, conductometric measurements are quite simple to carry out. Still, before beginning the analysis, some crucial factors like the temperature dependency, the selection of an appropriate conductometric measuring cell, and the selection of a calibration standard should be carefully taken into account. Otherwise, erroneous outcomes might be obtained. If you need a high-quality Conductivity Sensor online, please visit the website of Petron Thermoplast today!