Which cell constant should I choose for a 3400 series contacting conductivity sensor?

Document ID

Document ID TE12913

Published Date

Published Date 07/01/2022
Question
Which cell constant should I choose for a 3400 series contacting conductivity sensor?
Summary
choosing a 3400 series sensor for your process
Answer
The available cell constants for the 3400 series sensors are listed below.  They can also be found in the Digital D3400 sc Conductivity/Resistivity Sensor Data Sheet_LIT2468
The below chart includes an absolute range which is the is the full range of conductivity values that each type of sensor can display. It also shows a practical range, which is the measurement range that is optimal for each cell constant.  
 
When choosing the sensor that will yield the best accuracy for your application, please choose the lowest cell constant available that has a practical range covering both your lowest and highest conductivity values.  It is best to use the practical range instead of the absolute range.  When measuring a conductivity value below the practical range of a sensor, you may still yield a value on the display of your controller but that value will likely be inaccurate.
If the process mostly has low conductivity values but may occasionally yield very high excursions, you must decide whether it is more important to have a high degree of accuracy for the average reading by choosing a low cell constant sensor or to capture the high conductivity excursions by choosing a higher cell constant.
 
If you need a cell constant lower than 0.05, you may want to look into the 9500sc ultrapure controller  and the 8310 conductivity sensor.

See the following articles for more information on contacting conductivity sensors

Are the measuring ranges of contacting conductivity series 34xx independent of which controller is used?

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