3.2 Soft Keys
On / Off key - Used to turn the IAQ meter on or off. Press to turn
on, press and hold to turn off.
Up Arrow key - Used to select and change parameters.
Down Arrow key - Used to select and change parameters.
Mode key - Used to switch between Celsius and Fahrenheit units
of display and to enter CO2 alarm level input mode. Press to
switch between Celsius and Fahrenheit units. Press and hold to
enter and exit CO2 alarm level mode.
Backlight key - Used to turn the display backlight on and off.
Min / Max key - Used to activate and cycle through minimum,
maximum, and average display modes. Press to activate Min/Max
mode, press repeatedly to cycle through min, max, and avg dis-
plays. Press and hold to deactivate Min/Max mode.
Log key - Used activate and deactivate data logging.
RCL Key - Used to recall (display) logged data.
9. Technical Information
Recommended Levels by Agency
Parameter IDPH1ASHRAE2OSHA PEL3ACGIH TLV4
Humidity 20% - 60% 30% - 60% N/A N/A
Temperature 68 - 75 (winter)
73 - 79 (summer) 68 - 75 (winter)
73 - 79 (summer) N/A N/A
Carbon Dioxide 1,000ppm
(<800ppm preferred) 1,000ppm 5,000ppm 5,000ppm
Carbon Monoxide 9ppm 9ppm 50ppm 25ppm
N/A-Not Applicable or Not Established
1Illinois Department of Public Health (2009)
2American Society of Heating, Refrigerating and Air Conditioning Engineers
3Occupational Safety and Health Administration Permissible Exposure Limit -- this level
is a time-weighted average and is an enforceable standard that must not be exceeded
during any eight-hour work shift of a 40-hour work week.
4American Conference of Governmental Industrial Hygienist Threshold Limit Value -- this
level is a recommended time-weighted average upper limit exposure concentration for a
normal eight to 10-hour workday and a 40-hour work week.
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