
CO2Levels and Guidelines
Non-Enforced Reference levels:
250 - 350 ppm –background (normal) outdoor air level
350- 1,000 ppm - typical level found in occupied spaces
with good air exchange. 1,000 –2,000 ppm - level
associated with complaints of drowsiness and poor air.
2,000 –5,000 ppm –level associated with headaches,
sleepiness, and stagnant, stale, stuffy air. Poor concentration,
loss of attention, increased heart rate and slight nausea may also
be present.
>5,000 ppm –Exposure may lead to serious oxygen deprivation
resulting in permanent brain damage, coma and even death.
Regulatory exposure limits:
ASHRAE Standard 62-1989: 1000ppm: CO2concentration in
occupied building should not exceed 1000ppm.
OSHA: 5000ppm: Time weighted average over five 8-hour
work days should not exceed 5000ppm
Building bulletin 101 (Bb101): 1500ppm. UK standards for schools
say that CO2at averaged over the whole day(i.e. 9am to 3.30 pm)
should not exceed 1500ppm.
Germany, Japan, Australia, UK...: 5000ppm, 8 hours
weighted average in occupational exposure limit is 5000ppm
Warranty
Triplett / Jewell Instruments extends the following warranty to the original purchaser of
these goods for use. Triplett warrants to the original purchaser for use that the products
sold by it will be free from defects in workmanship and material for a period of (1) one
year from the date of purchase. This warranty does not apply to any of our products
which have been repaired or altered by unauthorized persons in any way or purchased
from unauthorized distributors so as, in our sole judgment, to injure their stability or
reliability, or which have been subject to misuse, abuse, misapplication, negligence,
accident or which have had the serial numbers altered, defaced, or removed.
Accessories, including batteries are not covered by this warranty
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