FAQ 5. Which Gas Sensors is suitable for which gas?

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GAS SENSOR TECHNOLOGY

Depending on the type of gas and the range of detection required, one Gas Sensor technology is more suitable than others.  The following list shows the technology used for a particular gas and the typical range.

GAS
FORMULA
TYPICAL RANGES
SEMICONDUCTOR
HCFC’s – typical examples

R22, R123

10-10,000ppm
CFC’s – typical examples

R11,R12

10-10,000ppm
HFC’s – typical examples

R134a, R404A, R407, R410A, R507, R442D, R417A, R427A, R442A

10-10,0000ppm
Hydrocarbons –
typical examples

Methane(Natural gas),
Propane (R290),
Butane (R600),
Isobutane (R600A),
Ethylene (R1150),
Propylene (R1270),
Dimethylether,
LPG,
H2

0-10,000ppm
Ammonia (R717)

NH3

0-10,000pm
VOC’s – typical examples

Acetone, Chloroform, Ethanol, Methanol, Methyl and Methylene Chloride, Ethyl and Ethylene Chloride

0-10,000ppm
INFRARED
Carbon Dioxide (R744)
CO2 standard model
0-10,000ppm
(0-1%vol)
Carbon Dioxide (R744)
CO2 special request
0-1,000ppm,
0-2,000ppm,
0-20,000ppm,
0-5% ,  0-10%
CATALYTIC
All Combustible gases
including Ammonia
0-100% LEL
GAS
FORMULA
TYPICAL RANGES
ELECTROCHEMICAL
Ammonia

NH3

0-100ppm,
0-1.000ppm,
0-5.000ppm
Carbon Monoxide

CO

0-100ppm,
0-1.000ppm
Chlorine

Cl2

0-50ppm
Chlorine Dioxide

CLO2

0-1ppm
Ethylene

C2H4

0-1000ppm
Ethylene Oxide

C2H4O

0-20ppm
Fluorine

F2

0-1ppm
Hydrazine

N2H4

0-1ppm
Silane – Hydride

SiH4

0-5ppm
Hydrogen

H2

0-1.000ppm,
0-10.000ppm,
0-100% LEL
Hydrogen Chloride

HCl

0-50ppm
Hydrogen Cyanide

HCN

0-50ppm
Hydrogen Fluoride

HF

0-10ppm
Hydrogen Sulphide

H2S

0-30ppm,
0-200ppm
Nitric Oxide

NO

0-100ppm,
0-500ppm
Nitrogen Dioxide

NO2

0-50ppm
Oxygen

O2

0-25%
Ozone

O3

0-5ppm
Sulphur Dioxide

SO2

0-100ppm

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