Gas or Vapour to be Measured Chemical Formula	Réf tube	Gastec Tube No. & Name	Measuring Range (ppm)	No.of Pump Strokes	Shelf Life (year)	Note		TLV- TWA,C (ACGIH) (ppm)
Acetaldehyde CH3CHO	92	Acetaldehyde	300-750	1	2*	T		C 25
			10-300	2
			5-10	4
	92M	Acetaldehyde	5-100	1	2*	-
			2.5-5	2
Acetic acid CH3CO2H	81	Acetic acid	50-100	1/2	3	H		10
			2-50	1
			1-2	2
	81L	Acetic acid	10-25	1/2	2*	T
			0.25-10	1
			0.125-0.25	2
	80	Acid gases	40-80	1	2	-
			2-40	2
			1-2	4
Acetic anhydride (CH3CO)2O	81	Acetic acid	0.6-15	1	3	H		5
Acetone CH3COCH3	151	Acetone	0.8-2%	1	3	T		500
			0.05-0.8%	2
	151L	Acetone	4000-12000	1	2*	T
			50-4000	2
Acetone cyanohydrin (CH3)2C(OH)(CN)	12L	Hydrogen cyanide	2.88-69	1	2	H		C 4.7
Acetonitrile CH3CN	52	Nitroparaffin (Pyrotectube)	3-180	1	3	-		40
Acetylene HCßCH	171	Acetylene	2-4%	1/2	3	T		-
			0.1-2%	1
			0.05-0.1%	2
	103	Hydrocarbons (LowerClass)	1.8-3.6%	1/2	2	++
			0.15-1.8%	1
			0.075-0.15%	2
	172	Ethylene	32.5-1040	1	3	-
Acetylene dichloride	See 1,2-Dichloroethylene
Acid gases	80	Acid gases	40-80	1	2	-		-
			2-40	2
			1-2	4
Acrolein CH2:CHCHO	93	Acrolein	10-800	2	2*	T		C 0.1
			3.3-10	4
Acrylicacid CH2:CHCO2H	81	Acetic acid	2-50	1	3	H		2
Acrylonitrile CH2:CHCN	191	Acrylonitrile	120-360	1	3	+T		2
			5-120	2
			2-5	4
	191L	Acrylonitrile	6-18	1	3	+
			0.2-6	2
			0.1-0.2	4
	102L	n-Hexane	0.06-1.44%	1	3	-
Allyl Isothiocyanate CH2:CHCH2NCS	149	Methyl metacrylate	5-200	2	2	T		-
Allyl chloride CH2:CHCH2Cl	101L	Gasoline(Petrol)	0.1-3.4%	1/2	3	-		1
	131L	Vinyl chloride	3.2-48	2	2*	+T
Amines RENH2 calibration	180	Amines	1-280	1	3	T		-
Amines CH3NH2 calibration	180L	Amines	0.25-39	1	2	T		-
2-Aminoethanol	See Ethanolamine
Ammonia NH3	3H	Ammonia	16-32%	1/2	3	-		25
			1-16%	1
			0.2-1%	2-5
	3HM	Ammonia	1.6-3.52%	1/2	3	-
			0.05-1.6%	1
	3M	Ammonia	500-1000	1/2	3	-
			50-500	1
			10-50	2-5
	3La	Ammonia	100-200	1/2	3	T
			5-100	1
			2.5-5	2
	3L	Ammonia	30-78	1/2	3	-
			1-30	1
			0.5-1	2
	180	Amines	1.5-30	1	3	T
n-Amyl acetate CH3CO2(CH2)4CH3	147	n-Amyl acetate	10-200	2	2	T		100
Aniline C6H5NH2	181	Aniline	30-60	2	3	-		2
			2.5-30	3
			1.25-2.5	5
Arsine AsH3	19LA	Arsine	2.4-10	1	2	-		-
			1.5-2.4	3
			0.1-1.5	5
			0.04-0.1	10

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