8
• Consideration must be given to factors such as time,
temperature and relative humidity.
• Most accelerants/hydrocarbons are more pronounced
as aerosol particles on warm, dry days than on cold,
damp days. These factors will influence the volatility of
hydrocarbons.
• If there is an area of suspicion and you do not get a
reading, put the Model 850 in its most sensitive mode
(indicated by a very slow beep and flash rate) and
observe if any change in beep rate occurs upon further
investigation of the suspect area.
Model 850 Operation
Scanning for Gases