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Contacting Conductivity Sensors SC42/SC4A

Why measure Conductivity?

It can be used as a fairly inexpensive and low maintenance indicator of water quality.  Good quality water with little contaminants will have a low conductivity.  There is far less maintenance than pH and minimal calibration. Conductivity is used in Boiler feedwater, RO, and Demineralizer applications.

Since conductivity, up to a point, increases with an increase in the concentration of the ions in the process, we can use it to correlate to a % concentration value of solutions such as acids or bases.  Again, since conductivity is non-specific, % concentration can only be measured on ONE chemical at a time and not a mixture of contributing chemicals.

There are two basic sensor styles used for measuring Conductivity: Contacting and Inductive (Toroidal, Electrodeless).

When Contacting Sensors are used, the conductivity is measured by applying an alternating electrical current to the sensor electrodes (that together make up the cell constant) immersed in a solution and measuring the resulting voltage. The solution acts as the electrical conductor between the sensor electrodes.

The accuracy of conductivity measurements can be influenced by the following factors:

  • Polarization.
  • Contamination: Deposits or coating on the electrode surface of a 2-pole cell have a similar effect to polarization errors, i.e. the conductivity reading is lower than usual. These effects can also be prevented with a 4-pole conductivity cell.
  • Cable resistance: The cable resistance can induce error in the measurement and must be taken into account.
  • Temperature: Conductivity measurements are temperature dependent, if the temperature increases, conductivity increases.

Series (2)

  SC42 Large-Bore SC4A SC42 Small-Bore
Model Code SC42 Large Bore SC4A SC42 Small Bore
Cell Constants 0.01/cm; 0.1/cm; 1.0/cm 0.02/cm; 0.1/cm 0.02/cm; 0.1/cm; 1.0/cm
Ranges 0.02-2,000 µS/cm; 0.2-20,000 µS/cm; 2.0-200,000 µS/cm 0.04-400 µS/cm; 0.2-2,000 µS/cm 0.04-400 µS/cm; 0.4-2,000 µS/cm; 4.0-5,000 µ/cm
Temperature Element Pt1000 Pt1000 Pt1000
Pressure Rating 10 bar/142 PSIG 10 bar/142 PSIG 7 bar/100 PSIG
Maximum Temperature 150°C/302°F 110°C/230°F 100°C/212°F
Installation Connections Requires FD40, FS40 or FF40 Holder 3/4" NPT Fitting; 1", 1.5" or 2" Tri-Clamp; Retractable 3/4" NPT Fitting; 1", 1.5" or 2" Tri-Clamp
Integral Cable NO YES YES
Materials Of Construction 316 Stainless Steel 316 Stainless Steel or Titanium 316 Stainless Steel or Titanium
Design Sytle 2-Electrode 2-Electrode 2-Electrode

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