Information on the Gastech Model RI-411, infrared CO2 indicator (letter to the editor).

Details

• Personal Author:
  Gorman, Richard W. ; Holcom B ; Huebener DJ
• Description:
  Information on a problem discovered in the use of the Gastech Model R1-411, Infrared CO2 Indicator for evaluations of indoor air quality was provided. The approximate time constant and magnitude of the drift effect seen when the instrument was taken into a high carbon- dioxide (124389) (CO2) area were determined. Evaluation showed a problem exists in the instrument due to a dead air space between the infrared source and the active/reference cell. Changes in the concentration of CO2 in this space during a measurement caused the reading to change. Movement of the instrument from one area to another to measure CO2 levels may cause the data to be inaccurate. Possible fixes were investigated: pumping zero air into the dead air space; and pumping sample air into the dead air space. Although either fix will improve the precision, neither fix was entirely satisfactory. In a reply from the maker of the unit, possible modifications to the unit and alternative instruments for use in measuring CO2 for indoor air quality evaluations were discussed. [Description provided by NIOSH]
• Subjects:
  Air Pollution, Indoor Environmental Health Environmental Monitoring Occupational Health Safety
• Keywords:
  Air-quality-measurement Air-quality-monitoring Air-samplers Air-sampling-equipment Analytical-instruments Indoor-air-pollution Indoor-environmental-quality NIOSH-Author Testing-equipment
• ISSN:
  0882-8032
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  Ohio ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DPSE - Division of Physical Sciences and Engineering ; DSHEFS - Division of Surveillance, Hazard Evaluations, and Field Studies
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  4
• Issue:
  1
• NIOSHTIC Number:
  nn:00185439
• Citation:
  Appl Ind Hyg 1989 Jan; 4(1):F6-F8
• CAS Registry Number:
  Carbon dioxide (CAS RN 124-38-9)
• Federal Fiscal Year:
  1989
• Peer Reviewed:
  False
• Source Full Name:
  Applied Industrial Hygiene
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:dc946b0c2f9bd841c3943f1811aac23fd420ac918c1ff4680dc359023904cebb99cc3876deb447a85d4f2d955a6b6e3f549f4a31e4e765ae45084c753d9e2e90
• Download URL:
  https://stacks.cdc.gov/view/cdc/185704/cdc_185704_DS1.pdf
• File Type:
  [PDF - 415.24 KB ]