SACOR BUSINESS GROUP-2019 COMPANY CATALOGUE SACOR BUSINESS GROUP 2019 COMPANY CATALOGUE | Page 108

refereNce lIBrary
18.0
The carboxyhemoglobin level is a measure of the
amount of Carbon Monoxide which has been absorbed
into the blood stream. The chart converts the amount
of Carbon Monoxide measured in the exhaled breath to
the percentage carboxyhemoglobin level in the blood.
The UL 2034 level (10% carboxyhemoglobin) depicted
on the chart shows the average carboxyhemoglobin
concentration after a fifteen minute exposure to 400
ppm Carbon Monoxide. At this exposure level, the
average person will begin to experience the symptoms
of Carbon Monoxide poisoning.
16.0
14.0
12.0
45
ul 2034 leVel
10.0
8.0
6.0
4.0
2.0
0
10
20
30
40
50
60
70
80
90
100
ppm cO
WeIGHt Of VarIOus Gases cOmPared tO aIr
the following gases are lighter than air:
Acetylene
Ammonia
Carbon Monoxide
Ethylene
Hydrogen
Hydrogen Cyanide
Methane
the following gases are heavier than air:
Argon
Butane
Carbon Dioxide
Chlorine
Ethane
Hexane
Hydrogen Chloride
Hydrogen Sulfide
Methyl Ethyl Ketone
Methyl Mercaptan
Nitrogen Dioxide
Nitrous Oxide
Oxygen
Phosphine
Sulfur Dioxide
Propane
INtrINsIc safety
Who verifies intrinsic safety?
Equipment is tested and certified for intrinsic safety by
independent third party agencies, such as Underwriters
Laboratories (UL), Canadian Standards Association (CSA),
Factory Mutual Research Corporation (FM) and the Mine
Safety and Health Administration (MSHA). Independent
testing ensures that your gas monitoring equipment is
not only designed to be intrinsically safe, but meets all
required standards for intrinsic safety.
fIre
trIaNGle
How is intrinsic safety defined?
Intrinsically safe equipment and wiring shall not be capable
of releasing sufficient electrical or thermal energy under
normal or abnormal conditions to cause ignition of a flam
mable or combustible atmospheric mixture in its most easily
ignitable concentration.
What is intrinsic safety?
Intrinsic safety is a design technique applied to electrical
equipment and wiring for hazardous locations. The tech-
nique is based on limiting energy, electrical and thermal, to
a level below that required to ignite a specific hazardous
atmospheric mixture.
SOURCE OF IGNITION
Ref: R. Stahl – Intrinsic Safety Primer ©1988
National electrical code article 504-2
definition of a Intrinsically safe circuit © 1996
A circuit in which any spark or thermal effect is incapable of causing
ignition of a flammable or combustible material in air under prescribed
test conditions.