Amperometric Hydrogen micro-sensor - AMT Analysenmesstechnik ...

General informations about the amperometric hydrogen micro-sensor2________________________________________________________________________________________________The advantages of the micro-sensor technologyFor manufacturing the amperometric H 2 sensor a special geometric design has been choosen to builta real micro-sensor. Electrode diameters below 25 µm, a very thin special membrane with smalldiameters, extremly short diffusion distances for the hydrogen to the working electrode and anegligible analyte consumption at the electrodes leading finally to response times (t 90% ) of less than 2seconds. The analyte consumption effects are negligible too, so that streaming of the sensormembrane and stirring is not necessary. Besides, the dimensions of the sensitive tips within a rangeof some micrometers allow insitu measurements without destroying equilibriums, concentrationgradients and geometrical structures. This is very important, if measurements in muddy sedimentsare required.Technical data for all H 2 -micro-sensor heads independent from the sensordesign *) measuring principle: amperometric membrane covered microsensor 3 sensor electrodes exchangeable sensor head necessary time for the first polarization: approx. 15-30 minutes streaming of the membrane or stirring is not necessary, low analyte consumption suitable for the determination of concentration gradients with high local resolution measuring ranges: 0,0002....3 mg/l H 2others on request accuracy of the sensor:: better than 2% of the measuring value temperature range: 0°C to 30°C response times: t 90% : below 2 seconds average life time: approximately 6-10 months, may be influenced by the samples matrix pressure stability: laboratory sensor orshallow water version for pressures of up to 10 bar or housing: all housings made of titanium*) Changes for technical improvement are reserved.________________________________________________________________________________________________AMT Analysenmesstechnik GmbH 2001