H2S Gas Meter/Detector

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H2S Gas Meter/Detector
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H2S Gas Meter/Detector

• Introduction
• Air monitoring data is useful for
• Assessing the health risks to the public and
  response workers.
• Selecting personal protective equipment.
• Delineating areas where protection is needed.
• Determining actual or potential effects on the
  environment.
• Selecting actions to mitigate the hazards
  safely and effectively.

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H2S Gas Meter/Detector

• To be useful air monitoring instruments must be
• Portable and rugged.
• Easy to operate.
• Inherently safe.
• Able to generate reliable and useful
  results.

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Toxic Atmosphere Monitors

• Toxic atmosphere monitoring is done to
• identify airborne concentrations that could
  pose a toxic risk to response workers and the
  public.
• evaluate the need for and type of personal
  protective equipment.
• set up work zones or areas where contaminants are
  or are not present.

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H2S Gas Meter/Detector

• The response time, sensitivity, selectivity,
  accuracy and precision of an instrument are
  important in evaluating the reliability and
  usefulness of the data the instrument generates.

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Toxic Atmosphere Monitors

• H2S must be monitored via real-time instruments
  because
• Highly toxic
• Causes olfactory desensitization
• Prevalence in confined spaces
• Primary cause of death in confined spaces

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H2S Gas Meter/Detector Limitations
Considerations

• Temperature
• Oxygen Levels
• Interfering Coumpounds
• Organic Lead
• Sulfur compounds
• Silicone
• Acid Gases

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H2S Gas Meter/Detector

• There are several gas monitors which utilize
  electrochemical cells or metal oxide
  semi-conductors (MOS) for detecting specific
  chemicals.
• The most common monitors are used to detect
  carbon monoxide or hydrogen sulfide but there are
  also monitors available for hydrogen cyanide,
  ammonia and chlorine.

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H2S Gas Meter/Detector

• Technology
• Electrochemical cells
• Solid-state sensors

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H2S Gas Meter/Detector

• Low power requirements
• Continuous operation for up to four months
• Can fit in shirt pocket

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H2S Gas Meter/Detector

• Calibration is performed electonically or by
  sample gas
• Factory calibration is recommended annually
• Sensor life may be dependent on use

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References Cited

• NIOSH Manual of Analytical Methods (NMAM), 4th
  ed.DHHS (NIOSH) Publication 94-113 (August,
  1994),Cassinelli, M.E. O'Connor, P.F.
  (pfo1_at_cdc.gov), Eds.

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Bibliography

• DiNardi Salvatore R. (1998) The Occupational
  Environment-Its Evaluation and Control, AIHA,
  Fairfax, Virginia
• Goetsch David L. (1999) Occupational Safety and
  Health for Technologists, Engineers, and
  Managers, Prentice Hall, Upper Saddle River, New
  Jersey