• Ideal for wastewater, industrial and scientific research.
• Probes are delivered calibrated and ready to use.
• Easy to use with low maintenance.
• Extremely rapid response time of 1 to 2 seconds.
• Connect the sensor to your PLC or SCADA or Edaphic Scientific can supply a logging system for you.

 

dissolved hydrogen peroxide sensor

The ES-H₂O₂-SW amperometric sensor has been developed for the in-situ determination of hydrogen peroxide containing aqueous solutions. Therefore the sensor is suitable for direct measurements in coloured and turbid solutions (wastewater), in industrial plants, but also in biological research.

Compared with all the other commercially available hydrogen peroxide sensors, this amperometric H₂O₂ micro-sensor works with such a low analyte consumption, that streaming of the sensor membrane or stirring of the analyte is not necessary. And, an additional stirrer is not necessary for stationary measurements.

The second advantage of the ES-H₂O₂-SW sensor is the very fast response time with t90% =1-2 seconds.

The third advantage of the new micro-sensor is based on the micro-sensor technology itself. High signal stability, high local signal resolution allows some new applications, as for instance the profiling in µm-steps.

 

H₂O₂ amperometric measurements explained

Because of the partial pressure of the gaseous H₂O₂ dissolved in the sample, the analyte is separated from the inner electrolyte by means of the membrane. The membrane is only pervious to gases, so that liquids, ions and solids are not able to reach the inner electrolyte or the electrodes of the sensor.

The sensor contains inside a special electrolyte and 3 electrodes. The electrode materials have been selected and prepared very carefully to realize ideal electrochemical conditions. The time for the polarization, realized by means of the sensor’s integrated electronic device, is approximately 5…15 minutes after the first switching on or long breaks.

If the H₂O₂ has passed now the membrane, it reacts chemically with the redox catalyst and forms a new compound. After this, this compound is transported by diffusion to the working electrode followed by the electrochemical reaction. This causes a current depending on the hydrogen peroxide partial pressure/hydrogen peroxide concentration of the sample.

The observed current within a range of 0...400 picoamperes is converted into a voltage of 0...5 Volt inside the integrated electronic device of the sensor. Besides, in opposite to other measuring principles, the current flow in the amperometric sensor leads to a rapid decrease of the analyte inside the sensor resulting in very fast response times even though there is a concentration jump from high to low concentrations.

 

the importance of combined temperature measurements

All commercially available electrochemical sensors have to be combined with a temperature measurement and the amperometric H₂O₂ sensor too. When ordering a multi-sensor measuring system for laboratory use or a complete submersible probe system, the temperature measurement and the temperature correction of the sensor signal is already included.

If measurements in a flow through system are required, special temperature sensors for the integration in flow through cells are offered. When measuring in opened vessels or beakers in the laboratory, the customers have to realize the temperature measurement themselves. If a calibrated sensor is ordered, the temperature correction is very easy by means of a factor or for more accurate measurements by means of a mathematical formula, delivered with the sensor.

 

whole system monitoring solutions

Edaphic Scientific is a one-stop shop for a whole system monitoring solution. We provide water quality monitoring systems for researchers and industry.

Our systems not only support dissolved gas sensors, but related sensors such as temperature, weather sensors, and many more.

At Edaphic Scientific we want to work with you from the start of your project through to its completion. We can provide:

• Assistance with project and experimental design

• Procurement of all monitoring equipment, including sensors, data loggers and data management software. Edaphic Scientific is a one-stop shop where we can source and find any necessary equipment for your project from our preferred suppliers or third party suppliers

• Installation and training

• On-going assistance with data interpretation and equipment maintenance

• Data correction and analysis, including statistical analysis with the R-package

• Report and publication preparation including tables, figures, graphs, and manuscript writing

 

advanced data collection and management solutions

Edaphic Scientific recognises the need for flexible and adaptable sensor and data logging solutions for experimental or environmental monitoring projects.

Data can be downloaded directly in the field from data loggers. A direct connection between the data loggers and your computer, via a USB cable, can be used for manual downloading of data.

Alternatively, data can be downloaded over the internet on your iPhone, iPad or desktop computer with the Eagle.io cloud-based, data management software solutions. Through this remote based downloading capabilities, you can download, view and manage your data, and system, anywhere in the world and at anytime.