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Sulfur dioxide

sulfur dioxide, sulfurous acid anhydride, sulfurous oxide, sulfur oxide, Sulfotep

How to detect Sulfur dioxide

Formula: SO2 | CAS: 7446-09-5

Synonyms: sulfur dioxide, sulfurous acid anhydride, sulfurous oxide, sulfur oxide, Sulfotep

Specification

Specification	Value/Information
Formula	SO2
CAS no.	7446-09-5
Gas Response Factor, 11.7 eV	ZR
Gas Response Factor, 10.6 eV	ZR
Gas Response Factor, 10.0 eV	ZR
ppm per mg/m⁻³, (20 °C, 1 bar)	0.375
Molecular Weight, g/mole	64.1
Melting point, °C	-76
Boiling point, °C	-10
Flash point, °C	-
Lower Explosive Limit, %	-
Density, g.cm⁻³	1.25

Specification	Value/Information
Ionisation Energy, eV	12.3
EH40 TWA, ppm	0.5
EH40 TWA, mg.m⁻³	1.3
EH40 STEL, ppm	1
EH40 STEL, mg.m⁻³	2.7
NIOSH ST, ppm	3
NIOSH TWA REL, ppm	2
NIOSH ST, mg.m⁻³	13
NIOSH TWA REL, mg.m⁻³	5
NIOSH IDLH, ppm	100
OSHA TWA PEL, ppm	5
OSHA TWA PEL, mg.m⁻³	13

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Comparative specifications
Sensor Variant	MiniPID 2 PPM WR VOC Sensor	MiniPID 2 PPM VOC Sensor	MiniPID 2 PPB WR VOC Sensor	MiniPID 2 PPB VOC Sensor	MiniPID 2 HS VOC Sensor	MiniPID 2 10.0 eV VOC Sensor	MiniPID 2 11.7 eV VOC Sensor
Electrode Stack Colour	Blue	Blue	White	White	Red	White + Gold Spot	White
Minimum Detection Limit	500 ppb	100 ppb	20 ppb	1 ppb	0.5 ppb	5 ppb	100 ppb
Range	0 to >10,000 ppm	0 to 4000 ppm	0 to >200 ppm	0 to >40 ppm	0 to >3 ppm	0 to >100 ppm	0 to >100 ppm
Response Time T90 (s)	<3	<3	<8	<8	<12	<8	<8
Sensitivity	>0.4 mV/ppm @ 100ppm	>0.65 mV/ppm @ 100 ppm	>5 mV/ppm	>30 mV/ppm	>600 mV/ppm	>15 mV/ppm	>1 mV/ppm
Lamp Energy	10.6 eV	10.6 eV	10.6 eV	10.6 eV	10.6 eV	10.0 eV	11.7 eV
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