As difficult is it may seem on the surface, converting parts per million (ppm) to % volume is actually very simple! Think of 1 ppm as 1/1,000,000 which equals 0.000001 or 0.0001%. Dividing 1 by 10,000 and then interpreting the results as a percentage will net you the same result.
Using that same logic in a real world example, lets say a customer requested a mixture of 6000 ppm propane in air and like most customers, they required a high degree of accuracy to satisfy safety requirements within their plant.
Our supplier classified propane by % vol. rather than by ppm. To be sure the customer received exactly what they needed, we had to convert their 6,000 ppm mixture to % vol. To do that, we simply divided 6000 by 10,000 for a net result of 0.6% Vol. (30% LEL). Learn more about Lower Explosive Limit (LEL) calibration gas.
Interested in learning more? Contact a Cross Company team member today to discuss your project or application in detail and see how one of our solutions can benefit your operation!