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Dichlorofluoromethane

dichloro(fluoro)methane, R21, dichlorofluoromethane, Halon® 112, Refrigerant 21

How to detect Dichlorofluoromethane

Formula: CHFCl2 | CAS: 75-43-4

Synonyms: dichloro(fluoro)methane, R21, dichlorofluoromethane, Halon® 112, Refrigerant 21

Specification

Specification	Value/Information
Formula	CHFCl2
CAS no.	75-43-4
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)	0.234
Molecular Weight, g/mole	102.9
Melting point, °C	-135
Boiling point, °C	9
Flash point, °C	-36
Upper Explosive Limit, %	54.7

Specification	Value/Information
Lower Explosive Limit, %	-
Density, g.cm⁻³	1.48
Ionisation Energy, eV	12.39
EH40 TWA, ppm	10
EH40 TWA, mg.m⁻³	43
NIOSH TWA REL, ppm	10
NIOSH TWA REL, mg.m⁻³	40
NIOSH IDLH, ppm	5000
OSHA TWA PEL, ppm	1000
OSHA TWA PEL, mg.m⁻³	4200

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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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