Tenmars ST-502, User Manual

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3
5 Operation
5.1 Applications

Building air conditioning system (HVAC)
monitoring.

Indoor air quality monitoring.
5.2 CO
2
Concentration and Guidelines

As indicated according to ASHRAE standard
62.1-2013 Appendix B Summery of Selected
Air Quality Guidelines, carbon dioxide may
cause risks to body health when the under very
high concentrations (for example greater than
5,000PPM).

NIOSH recommendations:
250-350ppm – Concentration of normal outdoor
environment
600ppm – Minimum requirement for good air
quality.
600-1000ppm – CO2 concentration slightly high
1000ppm – Insufficient ventilation
These standards are guideline references only; if
the CO2 content exceeds 1,000ppm, it does not
necessarily mean that the building is dangerous and
needs to be evacuated. This standard is used as a
guideline to help increase the level of comfort to a
maximum.