Sensors for Conductivity Measurement

Conductivity Sensors

Sensor Overview

IST's innovative thin-film conductivity sensor was developed for the purpose of measuring the concentration of ions in an electrolyte. Although a simple concept, the measurement of electrical conductivity in liquid substances is a very powerful analytical and diagnostic tool in a variety of applications. The modern, thin-film conductivity sensor element developed by IST is a viable alternative to the classical, bulky conductivity sensors of the past.

Key features include:

  • Conductivity range: 100 μS/cm to 200 mS/cm (other ranges on request
  • Temperature range: -30 °C to +100 °C (temperatures up to +130 °C possible)
  • Connection: Typically with Pt/Ni-wire or Cu/Ag-wire with PTFE-insulation (AWG 30)

Further features:

  • Fast response time
  • Excellent long-term stability*
  • Resistant to various chemicals*
  • Serializable (gamma/beta radiation, autoclaving)
  • Integrated Pt1000 for temperature compensation (Pt100 on request)
  • 4-electrode measurement (two electrodes on request)

    Customer-specific adaption possible

Theoretical Background
An electrolyte is a liquid containing ions. Under a voltage, ions act as charge carriers and a current flows. Therefore, quality of the liquid can be assessed by determining the conductivity. The conductivity of the liquid depends on two temperature-dependent parameters: ion concentration and their mobility. For improved accuracy a temperature sensor is placed directly at the point of measurement.

Temperature Compensation
The temperature of the medium is an important factor in the conductivity of an electrolyte. It is therefore important to have an accurate temperature sensor for compensation. The thin-film conductivity sensor, developed by IST, consists of two current electrodes, two measuring electrodes and a thin-film platinum temperature sensor for temperature compensation.

Conductivity Sensor Benefits and Characteristics:

  • Compact design, two in one chip (conductivity and temperature)
  • Wide conductivity and temperature range
  • Fast response time
  • Integrated temperature measurement and compensation
  • Resistance to various chemicals
  • Excellent long-term stability
  • Optimal accuracy
  • 2 or 4 electrode measurement
  • Customer specific sensor available upon request


Conductivity sensors play an important role in determining water quality, and are able to measure the conductivity of most electrolyte solutions. The IST conductivity sensor is an ideal choice for water quality and waste water treatment applications, as well as many other applications.

Our wide product range is the choice of many renowned end customers and OEMs in the following fields. While our products are widely used in these industries, they are by no means limited to them:

  • Building Automation
    The Heating Ventilation and Air-condition (HVAC) market in the Building Automation industry focuses on controlling atmospheric conditions to make them more suitable. Among the conditions controlled by these systems are temperature and humidity.
  • Appliances
    Measurement and control is an essential element in the success of products in the consumer appliance industry. Precise temperature measurement in cooking equipment along with flow control in cleaning equipment are crucial to the proper functioning of different appliances. IST’s sensors are more than capable of meeting the needs of products in the appliance industry.
  • Medical
    The medical industry requires the accurate and consistent performance of its equipment. IST’s precise and reliable sensors meet the needs of these applications.
  • Test & Measurement
    Test and measurement is an industry in which highly accurate and stable sensors are crucial. IST’s full line of sensors have applications in this industry. Our sensors can be directly integrated into instruments including assemblies, probes, meters, and more.
  • Process Control
    Measurement and control is an essential element in determining the effectiveness of products in the Process Control industry.A wide variety of applications are met in this industry by IST’s diverse family of sensors.
  • Automotive
    With new innovations in the automotive industry, the need for accurate and robust measurement methods has become relevant. IST’s sensing solutions satisfy this need. 

IST USA Division offers a high degree of flexibility in sourcing and supporting our products. We offer in-house stock and on-site engineering support, which is available during our regular business hours for design, application, and after sales support.

Our Sensor Offerings Include:
Temperature | Humidity | Flow | Conductivity | BioSensors | Thin-Film

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