如何计算% VOL或% LEL或% H2S到ppm?
                
	1%体积= 10,000 ppm
	1 % H2S(硫化氢)= 10000 ppm H2S
	因此
	例:求1.7%里有多少ppm。
	x(百万分之一)= 10000 ⋅ 1.7% = 17000 ppm
	 
	 
	 
	百分比到ppm的转换表
	
		
			| 体积百分比 | 百万分率 | 
		
			| 0% | 0 ppm | 
		
			| 0.0001% | 1 ppm | 
		
			| 0.001% | 10 ppm | 
		
			| 0.01% | 100 ppm | 
		
			| 0.1% | 1000 ppm | 
		
			| 1% | 10000 ppm | 
		
			| 2% | 20000 ppm | 
		
			| 3% | 30000 ppm | 
		
			| 4% | 40000 ppm | 
		
			| 5% | 50000 ppm | 
		
			| 6% | 60000 ppm | 
		
			| 7% | 70000 ppm | 
		
			| 8% | 80000 ppm | 
		
			| 9% | 90000 ppm | 
		
			| 10% | 100000 ppm | 
		
			| 20% | 200000 ppm | 
		
			| 30% | 300000 ppm | 
		
			| 40% | 400000 ppm | 
		
			| 50% | 500000 ppm | 
		
			| 60% | 600000 ppm | 
		
			| 70% | 700000 ppm | 
		
			| 80% | 800000 ppm | 
		
			| 90% | 900000 ppm | 
		
			| 100% | 百万分之100万 | 
	
	为了计算%LEL对ppm,例如甲烷100% LEL = 5%体积= 50,000 ppm
	要计算50% LEL,将100%体积的ppm(50000 ppm)除以2或乘以. 50
	要计算10% LEL,将ppm除以10或乘以0.10