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New electrochemical O2-sensors

Oxygen sensors with long working life

Oxygen sensors usually work according to the amperometric method, in which an electrolysis flow is measured which is proportional to the oxygen concentration or the partial pressure. These sensors frequently have the disadvantage that the electrolyte material used is changed by the electrochemical reaction taking place. The sensor therefore has a limited working life, which is usually about one year.

The new electrochemical oxygen sensors from MST Intertrade GmbH do not suffer from this disadvantage. They use a new type of electrolyte material, whose electrochemical reaction does not result in the passivation of the electrode. The working life quoted by the manufacturer is therefore at least 10 years (20.8% O2 at 20 C). The sensitivity is reduced within three years by less than 15%, and after 10 years by a maximum of 30%. The sensors are available in two versions, with measuring ranges from 0 % to 30% O2 or 0% to 100% O2. They can be sued in a very wide working temperature range from -35 C to + 50 C. The sensors show no cross-sensitivity with most gases. At a temperature of 20 C for example, 10% CO, 30% CO2 and 30% H2 do not interfere with the measurement. The company also offers micro-sensors, which are used particularly in the area of work safety for portable gas measuring devices. These sensors are used for example in the mining industry, in order to warn miners of too low oxygen concentrations or dangerous methane concentrations. With a working life of at least three years, these sensors are also extremely durable.

 

MST (Micro Sensor Technology) Intertrade GmbH has introduced new electrochemical sensor cell for the detection of Oxygen (O2). This sensor cell has been developed using a completely new type of electrochemical reaction. MST IT's new O2 sensor cell utlizes a new type of reaction in the electrolit that will not loose its sensitivity. As a result, MST IT can now provide reliable Oxygen detection in a wide variety of extreme conditions. Below are listed a few of the advantages of our new sensor cell:

Increased Sensor Cell Life and Performance:

MST IT's sensor cell can not be destroyed by high O2 concentrations.

There is no electrochemical reaction causing passivation on our counter electrode.
As a result, our cell can reliably detect continuous O2 concentration without loosing sensitivity.

MST IT uses an electrolyte that will operate by - 35C ÷+50C. The temperature range -40C ÷+50C and lower available at request.

Gas Specific Detection:

MST IT's electrochemical sensor cell provides selective monitoring for Oxygen in 100% H2, 100% CO2, saturated hydrocarbons, mainly VOCs.

 


 

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