Conductivity Sensors

Electrical conductivity is the ability of a material to build an electric current in the presence of an electric field. Metals are good conductors and therefore exhibit a large conductivity. Insulators are bad conductors having a very small, close-to-zero conductivity. In liquids, particularly aqueous solutions, the conductivity is greatly affected by the amount of dissolved charged atoms or molecules (ions).

Conductivity measurements are widely used in industrial and environmental applications as a simple and inexpensive way to control the ionic content in a solution. In water purification systems, the conductivity is monitored with the help of conductivity sensors at different stages of the process. Since the mobility of the dissolved ions is affected by temperature, these monitoring systems are required to either control the process temperature or to compensate readings according to the sample temperature.

Innovative Sensor Technology IST AG has combined thin- and thick-film technologies to develop ceramic-based conductivity sensors that include a resistive temperature sensor (Pt1000 IEC 60751 F0.3), thus allowing for accurate compensation at the point of measurement. The conductivity sensor consists of two current electrodes and two measuring electrodes. This basic sensor design can be adjusted to specific applications and requirements.

With many years of experience, IST AG also offers development of customer-specific applications in terms of sensor technology development and consultation. As part of the standard development process, IST AG offers support at the point of implementation - this way we ensure the best sensor solution for specific applications. 

Let us know your requirements for your individual conductivity sensor today!

LFS1305 - Optimal for applications with a conductivity measuring range from 100 μS/cm to 200 mS/cm (typical cell constant of 0.86 cm -1)

The IST AG LFS1305 conductivity sensor offers a typical cell constant of 0.86 cm-1 and a conductivity measuring range from 100 μS/cm to 200 mS/cm within an operating temperature range of -30 °C to +100 °C. However, it easily withstands temperatures over 130 °C enabling processes like sterilization by autoclaving.

Further advantages of the LFS1305 thin-film conductivity sensor include:

  • Wide conductivity and temperature range
  • Fast response time
  • Optimal accuracy
  • Resistance to various chemicals1)
  • Excellent long-term stability
  • Integrated RTD for temperature compensation
  • Four-electrode measurement2)
  • Customer-specific sensor available upon request

The IST AG LFS1305 conductivity sensor is available with Pt/Ni-wires as standard wires.

Conductivity sensors play an important role in determining water quality, and are able to measure the conductivity of most electrolyte solutions. IST AG conductivity sensors are an ideal choice for water quality and waste water treatment applications, amongst others. 

For more information see:

Data Sheet Conductivity LFS1305

1) Aggressive media can influence the long-term stability. Chemical resistance of the sensor in the end application must be tested by the customer.

2) Two-electrode configuration available upon request.

LFS1505 - Optimal for applications with a conductivity measuring range from 100 μS/cm to 200 mS/cm (typical cell constant of 0.68 cm -1)

The IST AG LFS1505 conductivity sensor offers a typical cell constant of 0.68 cm-1 and a conductivity measuring range from 100 μS/cm to 200 mS/cm (extended range from 10 μS/cm to 200 mS/cm possible with cell-constant correction) within an operating temperature range of -30 °C to +100 °C. However, it easily withstands temperatures over 130 °C enabling processes like sterilization by autoclaving.

Further advantages of the LFS1505 thin-film conductivity sensor include:

  • Wide conductivity and temperature range
  • Fast response time
  • Optimal accuracy
  • Resistance to various chemicals1)
  • Excellent long-term stability
  • Integrated RTD for temperature compensation
  • Four electrode measurement2)
  • Customer-specific sensor available upon request

The IST AG LFS1505 conductivity sensor is available with either Pt/Ni-wires or Cu/Ag-wires with PTFE-insulation (AWG 30) as standard wires.

Conductivity sensors play an important role in determining water quality, and are able to measure the conductivity of most electrolyte solutions. IST AG conductivity sensors are an ideal choice for water quality and waste water treatment applications, amongst others.  

For more information see:

Data Sheet Conductivity LFS1505

1) Aggressive media can influence the long-term stability. Chemical resistance of the sensor in the end application must be tested by the customer.

2) Two-electrode configuration available upon request.

LFS1710 - Optimal for applications with a conductivity measuring range from 0.2 mS/cm to 200 mS/cm (typical cell constant of 0.44 cm -1)

The IST AG LFS1710 conductivity sensor offers a typical cell constant of 0.44 cm-1 and a conductivity measuring range from 0.2 mS/cm to 200 mS/cm within an operating temperature range of -30 °C to +100 °C. However, it easily withstands temperatures over 130 °C enabling processes like sterilization by autoclaving.

Further advantages of the LFS1710 thin-film conductivity sensor include:

  • Wide conductivity and temperature range
  • Fast response time
  • Optimal accuracy
  • Resistance to various chemicals1)
  • Excellent long-term stability
  • Integrated RTD for temperature compensation
  • Four-electrode measurement2)
  • Customer-specific sensor available upon request

The IST AG LFS1505 conductivity sensor is available with either Pt/Ni-wires or Cu/Ag-wires with PTFE-insulation (AWG 30) as standard wires.

Conductivity sensors play an important role in determining water quality, and are able to measure the conductivity of most electrolyte solutions. IST AG conductivity sensors are an ideal choice for water quality and waste water treatment applications, amongst others. 

For more information see:

Data Sheet Conductivity LFS1710

1) Aggressive media can influence the long-term stability. Chemical resistance of the sensor in the end application must be tested by the customer.

2) Two-electrode configuration available upon request.

LFS1107 - Optimal for applications with a conductivity measuring range from 10 μS/cm to 200 mS/cm (typical cell constant of 0.42 cm -1)

The IST AG LFS1107 conductivity sensor offers a typical cell constant of 0.42 cm-1 and a conductivity measuring range from 10 μS/cm to 200 mS/cm within an operating temperature range of -30 °C to +100 °C. It can also withstand temperatures over 130 °C enabling processes like sterilization by autoclaving. It features a new glass coating for improved chemical resistance.

Further advantages of the LFS1107 thin-film conductivity sensor include:

  • Widest conductivity and temperature range
  • Small footprint
  • Improved chemical resistance1)
  • Excellent long-term stability
  • Integrated RTD for temperature compensation
  • Four-electrode measurement2)
  • Customer-specific sensor available upon request

The IST AG LFS1505 conductivity sensor is available with either Pt/Ni-wires or Cu/Ag-wires with PTFE-insulation (AWG 30) as standard wires.

Conductivity sensors play an important role in determining water quality, and are able to measure the conductivity of most electrolyte solutions. IST AG conductivity sensors are an ideal choice for water quality and waste water treatment applications, amongst others.

For more information see:

Data Sheet Conductivity LFS1107

1) Aggressive media can influence the long-term stability. Chemical resistance of the sensor in the end application must be tested by the customer.

2) Two-electrode configuration available upon request.