Extech Instruments C015, User Manual

CO15-en-GB_v1.0   6/17 

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Electromagnetic (EMI) interference my cause erratic 
meter readings; do not place meter near areas of high 
EMI when taking CO measurements. 



Recovery time is required after the meter has been 
exposed to high levels of CO (the longer the exposure, 
the longer the recovery time). 

Carbon monoxide is life threatening even at 
relatively low concentrations; learn and 
recognize the effects of CO poisoning (see Table 
below). Do not use this meter as a personal 
safety monitoring device. 

Effects of Carbon Monoxide (CO) Poisoning 

Warning:  Ensure  that  the  meter  is  powered  on  in  room 
temperature and in an area free of CO. If not, the meter 
will read incorrectly when subsequently measuring CO. 

0-1 PPM 

Normal background levels 

9 PPM 

Maximum allowable short term 
exposure 

50 PPM 

Maximum allowable continuous 
exposure level in any 8-hour period, 
according to OSHA 

200 PPM 

Mild headache, fatigue, nausea and 
dizziness after 2-3 hours 

400 PPM 

Frontal headache with 1-2 hours, life 
threatening after 3 hours 

800 PPM 

Dizziness, nausea, convulsions within 
45 minutes. Unconsciousness within 2 
hours. DEATH WITHIN 2 TO 3 HOURS 

1600 PPM 

Headache, dizziness, nausea within 20 
minutes, DEATH WITHIN 1 HOUR 

3200 PPM 

Headache, dizziness, nausea within 5-
10 minutes. DEATH WITHIN 25-30 
MINUTES 

6400 PPM 

Headache, dizziness, nausea within 1-
2 minutes. DEATH WITHIN 10-15 
MINUTES 

12800 PPM 

DEATH WITHIN 1 TO 3 MINUTES