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HYDROGEN SULFIDE SENSOR USER MANUAL

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Summary of Contents for SULF Series

Page 1: ...1 HYDROGEN SULFIDE SENSOR USER MANUAL...

Page 2: ...Hydrogen sulfide sensor manual Copyright 2018 Unisense A S Version March 2018...

Page 3: ...HYDROGEN SULFIDE SENSOR MANUAL UNISENSE A S...

Page 4: ...ing a new sensor 11 Polarization 11 Pre polarization 12 Calibration 13 Calibration theory 13 Calibration in the laboratory 14 Calibration in the field 16 Re calibration 18 MEASUREMENTS 19 Mounting the...

Page 5: ...d repair or modification of the product In no event will Unisense A S be liable for any direct indirect consequential or incidental damages including lost profits or for any claim by any third party a...

Page 6: ...orking day E mail sales unisense com Unisense A S Tueager 1 DK 8200 Aarhus N Denmark Tel 45 8944 9500 Fax 45 8944 9549 Further documentation and support is available at our website www unisense com CO...

Page 7: ...7 RECOMMENDED AMPLIFIERS One channel amplifier Microsensor Monometer Multi channel amplifiers Microsensor Multimeter Field Microsensor Multimeter...

Page 8: ...e and minimal stirring sensitivity the H2S sensors makes it possible to make reliable and fast measurements at high spatial resolution Our H2S microsensors are miniaturized amperometric sensors with i...

Page 9: ...sensor signal is generated by re oxidation of ferrocyanide at the anode in the tip of the sensor Jeroschewski et al 1996 The internal guard anode facilitates a constant ratio of ferri to ferrocyanide...

Page 10: ...IMPORTANT Wrong polarization may destroy the sensor Type I hydrogen sulfide sensors label on the sensor shaft reads SULF xxx xxxxxx should be polarised with 200 mV Type II hydrogen sulfide sensors lab...

Page 11: ...it must be pre polarized for at least 2 hours before it can be calibrated and used After shorter periods without polarization the sensor should be pre polarized until it has shown a stable signal for...

Page 12: ...2S Stot 2 1 H30 for pH 9 Jeroschewski et al 1996 Thus it is necessary to know the pH i e to know H3O of the sample calibration solution to calculate Stot 2 see Figure 1 pH log H In solutions with a pH...

Page 13: ...l has stabilized during pre polarization The H2S microsensor responds linearly over a certain range e g 0 300 M above which the slope of the response curve decreases but the response and resolution ab...

Page 14: ...alibration 1 Prepare a stock solution A stock solution of S2 0 01M total sulphide is prepared anaerobically by dissolving 0 24 g Na2S 9 H2O in 100 mL of N2 flushed water in a closed container The fina...

Page 15: ...mes Mix the solutions If you have not added reductant oxygen that dissolve in the calibration solution will oxidize the sulfide so the stock solution should be added immediately after the oxygen remov...

Page 16: ...reagent 2 into a 10 ml glass vial with gas tight membrane lid Avoid head space Prepare as many vials as the number of calibrations you expect to make Bring reagent 1 the vials with reagent 2 and 1 ml...

Page 17: ...may require calibration only every 24 hours or less To minimize the need for calibration keep the sensor polarized between measurements if possible unless the time between measurements exceeds several...

Page 18: ...trical fields may interfere with the sensor signal Therefore we recommend that unnecessary electrical mechanical equipment is switched off and that the sensor or wires are not touched during measureme...

Page 19: ...red microns The sensor has been painted black to reduce this phenomenon however light may still enter the sensor through the tip which is not possible to paint Micromanipulator Interferences for gases...

Page 20: ...ts The most frequent construction options are described under sensor specification at our website The options include e g customer specified dimensions cable length etc If your specifications for a sp...

Page 21: ...he tip exposed to water or air The room in which the H2S microsensor is stored should be dry and not too hot about 5 35 C Type II Store dry on shelf at room temperature Cleaning the sensor Standard pr...

Page 22: ...1952 Photometric determination of hydrogen Sulfide and reducible sulfur in alkalies Anal Chem 24 1536 1540 Cline J D 1969 Limnol and Oceanogr 14 454 458 Jeroschewski P Steuckart C K hl M 1996 Anal Ch...

Page 23: ...the sensor tip Solution Rinse with 96 ethanol rinse with 0 01 M HCl and rinse with water Problem Measurements in two environments with equal H2S concen trations exhibit different signals Possible caus...

Page 24: ...UNISENSE DENMARK www unisense com info unisense com...

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