Conductivity Sensors
Why Measure Conductivity On-line?
Conductivity is a general measurement of the dissolved acids, bases, salts, and other dissolved solids in a liquid solution. Electrical conductivity is a good indication of purity (or lack there of) of the liquid. For this reason, it is commonly used in pure water measurements to determine the presence of contaminants. Conductivity is also an effective tool to measure the concentration of an acid or a base. The relationship of the concentration addition of an acid or base to pure water can be charted by a well defined curve of conductivity versus concentration. These measurements are often used to create solutions such as NaOH for clean-in-place applications.
2-Pole
4-Pole
Inductive
Which conductivity sensor style is right for me?
Selection of conductivity sensors is highly dependent on the application and measurement range. There are three main technologies to currently available to choose from.
2-Pole Conductivity
4-Pole Conductivity
Inductive Conductivity
Specifications
| Conducell UPW | Conducell 2DC | Conducell 4UxF | Conducell 4US | Conducell I | |
|---|---|---|---|---|---|
| Measuring Range | 0.01 - 1500 µS/cm | 10 µS/cm - 20 mS/cm | 1 µS/cm - 300 mS/cm | 0.1 µS/cm - 500 mS/cm | 100 µS/cm - 2000 mS/cm |
| Measurement Principle | 2-pole | 2-pole | 4-pole | 4-pole | Inductive |
| Operating Temperature Range | -10 - 140 °C (Arc: analog 0 – 110 °C, digital 0 – 130 °C) |
-5 – 80 °C | -20 – 150 °C (Arc: analog 0 – 110 °C, digital 0 – 130 °C) |
-20 – 135 °C | -10 – 125 °C |
| Pressure Range (bar g) | 0 – 10 bar (130 °C) | 0 – 6 bar | -1 – 20 bar (135 °C) -1 - 10 bar (140 °C) |
0 – 6 bar | 0 – 8 bar (125 °C) 0 - 12 bar (90 °C) |
| Hygienic Aspects | Autoclavable, CIP, SIP | -- | Autoclavable, CIP, SIP | CIP, SIP | CIP, SIP |
| Cell Constant | < 0.1/cm | 1/cm | 0.36/cm | 0.147/cm | 6.3/cm |
| Electrode Material | Stainless Steel 1.4435 | Graphite | S=Stainless Steel 1.4435 H=Stainless Steel 2.4602 T=Titanium Pt=Platinum |
Stainless Steel 1.4435 | Toroids (embedded in PEEK Body) |
| O-ring | EPDM | EPDM | EPDM | EPDM | -- |
Specific Applications
Resources
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Brochure - BioPharma
Innovative solutions for process analytics in biotechnological and pharmaceutical industries. -
Flyer - Conducell UPW
Overview of the features of the conductivity sensor Conducell UPW for Ultra pure water applications. -
Manual - Conducell 4UxF Sensors
Manual for Conducell 4UxF sensors.
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Does temperature affect conductivity measurement?
Yes, temperature has a direct impact on conductivity. Increasing temperature increases the mobility of ions within a solution and results in higher conductivity measurements. Temperature compensation can be performed using empirically derived temperature coefficients, which may be different for various solutions. -
Which liquid conductivity standard should I use for calibration?
A conductivity standard should be chosen that most closely matches the anticipated conductivity range of the process.
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Conductivity Knowledge Base Articles
A summary page with links for all conductivity related articles -
Conductivity Sensor Selection
There at three basic styles of conductivity sensors. This article discusses which products are the best fit for the application. -
How to Measure Sensor A-length
Sensor A-length determines the insertion depth of the sensor. This article shows how this measurement is made for various styles of sensors.
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