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12
TROUBLESHOOTING
Error
Description
Readings are erratic Replace the batteries or check the AC adaptor.
Readings drift
Poor ventilation
Error code Er-1
Temperature or humidity sensor malfunction
Error code Er-2
The detected temperature or humidity
exceeds the specified range
HCHO LEVEL GUIDELINES
The following guidelines provide reference levels for
formaldehyde exposure:
HCHO Level Description
0.03 ppm
Average outdoor air level.
0.10 ppm
Recommended upper limit for residences
(ASHRAE, ANSI,EPA, NIOSH STEL)
0.40 ppm
Recommended upper limit for manufactured homes
0.50 ppm
OSHA workplace limit
0.75 ppm
OSHA TWA limit over 8 hours
0.80 ppm
Level at which most people first detect odor
2.00 ppm
OSHA STEL limit