ANNUAL RECALIBRATION AND SERVICE
There are no user serviceable components in this product.
Although sensor life is typically more than five years the analyser should be re-
calibrated and serviced annually to correct for any long-term sensor or
electronics drift or accidental damage.
Local regulations may require more frequent re-calibration.
APPENDIX
Recommended
Carbon Dioxide
Levels
:
British Standards BS6896, BS6230 and BS5990 confirm CO
2
concentration should not exceed 2800ppm where people are working.
HSE Regulation EH40 sets the maximum occupational exposure limit
at 5000ppm.
BSRIA recommend a maximum of 800ppm over an eight hour time
weighted average.
ASHRAE (62/99) recommends a maximum level of 1000ppm.
Data on ambient CO
2
:
NOAA observatory
(US. National Oceanic and Atmospheric Administration)
http://www.cmdl.noaa.gov/ccgg/insitu.html
http://www.cmdl.noaa.gov/ccgg/iadv/
