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Conductivity Sensor Technology

Two Electrode Sensor Design


2 Electrode Technology

Pros

  • Low to Medium Conductivity Solutions
  • Highest Accuracy & Repeatability
  • Industry standard


Cons

  • Susceptible to Coating/Scale
  • Requires clean liquid (i.e - pure water measurement)
  • No Diagostic Capability
  • Direct Contact, Susceptible to Corrosion

 

Four Electrode Sensor Design

4 Electrode Technology

Pros

  • Low/Medium to High Conductivity
  • Compensation for Coating & Scale (Analyzer dependent)
  • Diagnostic for integrity & High Scaling
  • Smaller form factor and lower cost than competing Toroidal Sensor Technology


Cons

  • Not as Accurate or Repeatable as Two Electrode in Low Conductivities
  • Direct Contact, Susceptible to Corrosion




Applications

Cell
Constant
Conductivity Range
(MicroSiemen/CM2)
Two Electrode
Sensors
0.01 0 to 100 µS/cm2
0.02 0 to 250 µS/cm2
0.05 0 to 500 µS/cm2
0.10 0 to 1,000 µS/cm2
1.0 0 to 20,000 µS/cm2
2.0 0 to 30,000 µS/cm2
Four Electrode
Sensors
SM/HM Electrodes 0 to 1,400 µS/cm2
SH/TH/HH Electrodes 0 to 2,000,000 µS/cm2




 

Conductivity Chart

 

The above chart provides expected ranges for each style of conductivity electrode. Actual measurement ranges are dependent on the conductivity transmitter used with the sensor. As a general rule of thumb, two electrode conductivity sensors are best used in clean, low conductivity applications where there is little chance of coating or scaling on the sensor. Typical applications include water purification, deionization, demineralizer monitoring, and USP pharmaceutical water quality. Four electrode sensors include a separate set of electrodes that can compensate when build-up occurs. These sensors work well in higher conductivity applications where chemicals are present or pipe scale and light particulate matter may create fouling concerns with traditional two electrode sensor technology. Use four electrode sensors in applications such as fouled condensate detection, chemical concentration measurements, and waste water.