AMT Analysenmesstechnik GmbH Joachim-Jungius-Strasse 9 D-18059 Rostock, Germany Fon: + 49 (0) 381 40 59 380 Fax: + 49 (0) 381 40 59 200 E-Mail: [email protected] www.amt-gmbh.com ___________________________________________________________________________________ Shallow Water Hydrogen Sulphide Micro-sensor This amperometric H 2 S micro-sensor for shallow water has been developed for the insitu determination of dissolved H 2 S/Sulphide in natural waters. Because of the partial pressure of the gaseous H 2 S, the analyte is separated by permeation through the membrane. Inside the sensor the hydrogen sulphide reacts with a redox mediator. The reoxidation at the working electrode causes a current corresponding to the concentration of the dissolved molecular H 2 S amount. The sensor has a very short response time of down to 200 milliseconds and streaming is not necessary, so that profiling with high resolution is possible. The sensor works highly selective and there are no interferences to analytes like CO, CO 2 , H 2 O-vapour, CH 4 or NH 3 . Both salt concentrations of up to 40 g/l and turbid or coloured solutions do not interfere with the signal. For measuring the total sulphide concentration within a the pH-range between 5 and 8,5, the sensor has to be combined with a pH-sensor and always with a temperature measurement. Except the shallow water version for depths of up to 100 m, a laboratory version is available too. All sensors are delivered with slope, temperature compensation data and mathematical formulas for calculating the total sulphide amount. The exchange of sensor heads is very easy and could be done by the customer itself. The alternative exchange tip for dissolved oxygen extends the sensors flexibility. Technical data of the micro-sensor: measuring principle: amperometry power supply: 9 ... 30 VDC output: 0 ... + 5 VDC dimensions: diameter: 24 mm, length: 235 mm connector: SUBCONN BH-4-MP (others on request) housing: titanium concentration range: type I: 50 µg/l ... 10 mg/l H 2 S type II: 500 µg/l ... 50 mg/l H 2 S type III: 10 µg/l ... 3 mg/l H 2 S or dissolved oxygen sensor tip accuracy: 2% (measuring value) 1 digit pressure ranges: 10 bar or laboratory version pH-range: 0 ... 8,5 pH response time: t 90% : approx. 1 second average life time: 5-9 months (depends on H 2 S stress and on sample)

Shallow Water Hydrogen Sulphide Micro-sensor · measuring principle: amperometry power supply: 9 ... 30 VDC output: 0 ... + 5 VDC dimensions: diameter: 24 mm, length: 235 mm

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Page 1: Shallow Water Hydrogen Sulphide Micro-sensor · measuring principle: amperometry power supply: 9 ... 30 VDC output: 0 ... + 5 VDC dimensions: diameter: 24 mm, length: 235 mm

AMT Analysenmesstechnik GmbHJoachim-Jungius-Strasse 9D-18059 Rostock, GermanyFon: + 49 (0) 381 40 59 380Fax: + 49 (0) 381 40 59 200E-Mail: [email protected] www.amt-gmbh.com

___________________________________________________________________________________

Shallow Water Hydrogen Sulphide Micro-sensor This amperometric H2S micro-sensor for shallow water has been developed for theinsitu determination of dissolved H2S/Sulphide in natural waters. Because of thepartial pressure of the gaseous H2S, the analyte is separated by permeation through themembrane. Inside the sensor the hydrogen sulphide reacts with a redox mediator. Thereoxidation at the working electrode causes a current corresponding to the concen-tration of the dissolved molecular H2S amount. The sensor has a very short responsetime of down to 200 milliseconds and streaming is not necessary, so that profilingwith high resolution is possible. The sensor works highly selective and there are nointerferences to analytes like CO, CO2, H2O-vapour, CH4 or NH3. Both saltconcentrations of up to 40 g/l and turbid or coloured solutions do not interfere withthe signal. For measuring the total sulphide concentration within a the pH-rangebetween 5 and 8,5, the sensor has to be combined with a pH-sensor and always with atemperature measurement. Except the shallow water version for depths of up to 100m, a laboratory version is available too. All sensors are delivered with slope,temperature compensation data and mathematical formulas for calculating the totalsulphide amount. The exchange of sensor heads is very easy and could be done by thecustomer itself. The alternative exchange tip for dissolved oxygen extends the sensorsflexibility.

Technical data of the micro-sensor:

measuring principle: amperometrypower supply: 9 ... 30 VDCoutput: 0 ... + 5 VDCdimensions: diameter: 24 mm, length: 235 mmconnector: SUBCONN BH-4-MP (others on request)housing: titaniumconcentration range: type I: 50 µg/l ... 10 mg/l H2S

type II: 500 µg/l ... 50 mg/l H2Stype III: 10 µg/l ... 3 mg/l H2Sor dissolved oxygen sensor tip

accuracy: 2% (measuring value) 1 digitpressure ranges: 10 bar or laboratory versionpH-range: 0 ... 8,5 pHresponse time: t90%: approx. 1 secondaverage life time: 5-9 months (depends on H2S stress and on sample)