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UNISENSE HYDROGEN SENSOR User Manual

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HYDROGEN SENSOR USER MANUAL
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Summary of Contents for UNISENSE HYDROGEN SENSOR

  • Page 1 HYDROGEN SENSOR USER MANUAL...
  • Page 2 Copyright © 2016· Unisense A/S Version December 2016...
  • Page 3 HYDROGEN SENSOR USER MANUAL UNISENSE A/S...

  • Page 5: Table Of Contents

    TABLE OF CONTENTS WARRANTY AND LIABILITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 CONGRATULATIONS WITH YOUR NEW PRODUCT! .

  • Page 6: Warranty And Liability

    The warranty does not include repair or replacement necessitated by accident, neglect, misuse, unauthorized 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, arising out of the use, the results of use, or the inability to use this product .

  • Page 7: Congratulations With Your New Product

    • The seal is still intact. • The sensors are returned to Unisense for inspection within two weeks. • The sensors are correctly packed for return to Unisense, in accordance with the note included in the sensor box.
  • Page 8 RECOMMENDED AMPLIFIERS One-channel amplifier: Microsensor Monometer Multi-channel amplifiers: Microsensor Multimeter...

  • Page 9: Overview

    25 (tip diameter 20-30µm) 50 (tip diameter 40-60µm) 100 (tip diameter 90-110µm) 500 (tip diameter ~500µm) -MR (for use with microrespiration chambers MR-Ch) -N (Needle type sensor) -spec - Customer specified. Schematic view of a hydrogen sensor with a LEMO plug.

  • Page 10: Getting Started

    The signal from the hydrogen sensor is generated in picoampere . completed. Therefore the hydrogen sensor must be connected to a polarizing picoammeter (e .g . a Microsensor Monometer, a Microsensor Multi- meter, or Field Microsensor Multimeter) .

  • Page 11: C Alibration

    . Calibration must ydrogen reading be performed after The hydrogen sensor responds linearly, and consequently, a pre-polarization two-point calibration is sufficient . Prepare a water phase with when the sensor a defined hydrogen concentration, which is slightly above signal has the maximum expected hydrogen to be measured .
  • Page 12 For a Unisense CAL300 calibration chamber, 5 minutes of bubbling at a rate of 5 l per minute is sufficient time to achieve 99 % of the concentration . If the equipment (gas mixture controller) is available, this method can be convenient, as you can switch between different constant hydrogen conditions without changing the water .
  • Page 13 magnetic stirring can introduce electrical noise to the signal . The hydrogen in the water will slowly escape to the atmosphere and the concentration can only be considered constant for a few minutes . Hydrogen sensors respond linearly in the range of 0 to 100 % hydrogen and signals can be linearly converted to partial pressure .

  • Page 14: Measurements

    Hydrogen sensors can be used for a wide variety of measurements (see our web page for further information www . unisense .com) . The most common use of hydrogen sensors is for making profiles in e .g . sediment or animal tissue where a high spatial resolution is wanted, or for hydrogen measurements in water samples .

  • Page 15: I Nterference

    The sensitivity to sulfide gas can be as much as 10 % of the hydrogen sensitivity . In addition exposure to high sulfide gas concentration can affect the calibration of the hydrogen sensor . Therefore measurements done in environments with high sulfide...

  • Page 16: Advanced Use

    E .g . during enzyme assays in small samples in Unisense microrespiration chambers MRCh • Measurements of hydrogen under high external pressure e .g . in closed pressurized systems, underwater and deep sea applications • Long-term hydrogen monitoring If you have questions , please contact sales@unisense .com...

  • Page 17: Storage And Maintenance

    STORAGE AND MAINTENANCE Store the sensor in the protective plastic tube used for shipping . The hydrogen microsensor can be stored with the tip exposed to water or air . The room in which the hydrogen microsensor is stored should be dry and not too hot (10-30°C) . If the sensor is used regularly it can be stored polarized .

  • Page 18: References

    REFERENCES • Revsbech, N . P ., and B . B . Jørgensen . 1986 . Microelectrodes: Their Use in Microbial Ecology, p . 293-352 . In K . C . Marshall (ed .), Advances in Microbial Ecology, vol . 9 . Plenum, New York .

  • Page 19: Trouble Shooting

    TROUBLE SHOOTING TROUBLE SHOOTING Problem Decreasing sensitivity . Possible cause Contamination of the anode surface (e .g . by sulfide) . Solution Switch the polarization to -1000 mV for 30 seconds . After this period, switch the polarization back to +1000 mV . Repeat calibration procedures when the signal is stable again .
  • Page 20 . Connect the reference plug on the picoammeter (blue plug) with the medium you are measuring in . If you encounter other problems and need scientific/technical assistance, please contact sales@unisense.com for online support (we will answer you within one workday)
  • Page 21 Table 1. Equilibrium hydrogen concentrations (µmol/litre) at ambient hydrogen partial pressure of 1 atm. in water as a function of temperature. Ref. Wiesenburg and Guinasso 1979. J.Chem Eng. Data 24(4):356-360...
  • Page 24 UNISENSE, DENMARK www .unisense .com · info@unisense .com...

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