1. Manuals
  2. Brands
  3. UNISENSE Manuals
  4. Accessories
  5. SULF Series
  6. User manual

UNISENSE SULF Series User Manual

Hydrogen sulfide sensor user manual
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
HYDROGEN SULFIDE SENSOR USER MANUAL
1

Advertisement

Table of Contents
loading

Related Manuals for UNISENSE SULF Series

Summary of Contents for UNISENSE SULF Series

  • Page 1 HYDROGEN SULFIDE SENSOR USER MANUAL...
  • Page 2 Copyright © 2018 · Unisense A/S Version March 2018...
  • Page 3 HYDROGEN SULFIDE SENSOR MANUAL UNISENSE A/S...

  • Page 4: Table Of Contents

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

  • Page 5: 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 6: 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 7 RECOMMENDED AMPLIFIERS One-channel amplifier: Microsensor Monometer Multi-channel amplifiers: Microsensor Multimeter, Field Microsensor Multimeter...

  • Page 8: Overview

    OVERVIEW This manual covers all the Unisense hydrogen sulfide sensors . IMPORTANT Identify your sensor type before connecting to a picoammeter . Unisense sensors are neither IMPORTANT: The two types of sensors must be polarized intended nor differently . See Polarization section below . Wrong polarization approved for use of may destroy the sensor.
  • Page 9 In the Type I sensor (SULF-xxx) the signal is generated by oxidation of H S directly on the anode in the tip of the sensor . The type I sensor is sensitive to hydrogen and should not be used in environments with high hydrogen concentrations .

  • Page 10: Getting Started

    GETTING STARTED WARNING Do not remove the seal and protective plastic tube before npacking a new sensor polarization has When receiving a new microsensor remove the shock-absorbing been set correctly, grey plastic net . Do not remove the seal and protective tube the sensor has been before the following steps are successfully completed.

  • Page 11: P Re - Polarization

    Setting polarization on the PA2000 pre-polarization If you are using the legacy PA2000 please consult the PA2000 when the sensor manual, which is available on www .unisense .com/manuals signal has stabilized. If you are using another amplifier or sensor connection type,...

  • Page 12: C Alibration

    alibration alibration theory The sensor detects the partial pressure of H S gas, which is only one component of the total sulfide equilibrium system . If the total sulfide concentration, tot], is defined as: = [H S] + [HS ] + [S the H S concentration will be defined as S] = [S...

  • Page 13: Calibration In The Laboratory

    (Temperature in Kelvin) Figure 1. The species distribution of H2S, HS and S2- as a function of As H S sensors are sensitive to temperature, it is necessary to perform calibration and measurements at the same temperature . Please note that, in contrast to oxygen, the relationship between salinity, temperature and solubility is not well known and therefore not tabled for sulfide gas alibration in the laboratory...
  • Page 14 Please read the entire procedure below before the calibration is commenced . It is best to first prepare the Na S stock solution so it is ready . Then prepare the buffer and perform the calibration IMPORTANT quickly thereafter in order to avoid reintroduction of oxygen . It is important to perform NOTE: For field calibrations, an alternative method is...

  • Page 15: Calibration In The Field

    preferably performed with a pipette to minimize mixing with oxygen, and a maximum of 10% of the vial volume should be left as headspace . Close the container with a gas tight lid and shake vigorously . 3 . Obtain zero reading The signal at zero H S can be obtained by immersing the sensor tip into one of the vials with calibration buffer .
  • Page 16 Reagent 1: • 1 mM Na • 1 mM NaOH Prepare the solution in a membrane flask with gas-tight lid . After mixing, flush the solution with nitrogen gas to remove all oxygen and quickly place the lid on the flask . During storage, practically all sulfide in Reagent 1 will be in alkaline form and since it is stored in an gas-tight vial, it cannot evaporate to any significant degree .

  • Page 17: Re-Calibration

    For making higher or lower concentrated H S calibration solutions, make reagent 1 more or less concentrated with Na calibration Check the calibration at appropriate time intervals and repeat it, if the sensor exhibits significant drift . When the sensor is new, you may need to calibrate it every two hours .

  • Page 18: Measurements

    MEASUREMENTS WARNING ounting tHe sensors Measurements in Due to the small size of the microsensor tip and the steepness a light gradient of H S gradients in many environments, even a few microns’ should be avoided, displacement of the sensor tip may change its immediate H and interpretation environment .

  • Page 19: I Nterference

    nterference Chemical interferences are give in the table below for both types of hydrogen sulfide sensors . In addition, Type II sensors are sensitive to light because ferro cyanide reacts in light, especially blue (short-wave) light, which gives a false H S signal .

  • Page 20: Advanced Use

    . The options include e .g . customer specified dimensions, cable length etc . If your specifications for a special H S sensor are not described at our web page please contact sales@unisense .com for further options .

  • Page 21: Storage And Maintenance

    STORAGE AND MAINTENANCE LIGHT SENSITIVITY Type I Due to the light sensitivity of the Type I electrolyte H Store the H S microsensor unpolarized in the protective plexiglass microsensors tube used for shipping . Due to the light sensitivity of the should be applied electrolyte H S, microsensors should be applied and stored at low...

  • Page 22: References

    REFERENCES • Borum, J . et al . (2005) The potential role of plant oxygen and sulphide dynamics in die-off events of the tropical seagrass, Thalassia testudinum . Journal of Ecology 93: 148-158 • Budd, M .S . & Bewick, H .A . 1952: Photometric determination of hydrogen Sulfide and reducible sulfur in alkalies .

  • Page 23: Trouble Shooting

    1 cm un-insulated wire (If you are measuring in e .g . a sediment, just put the open wire end in the water column) . 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 24 UNISENSE, DENMARK www .unisense .com · info@unisense .com...

This manual is also suitable for:

H2s series

Table of Contents