In the chemical industry, EESIFLO has successfully supplied custom built units to measure the different forms of MDI. Methylene diphenyl diisocyanate (MDI) is an aromatic diisocyanate. Three isomers are common, varying by the positions of the isocyanate groups around the rings: 2,2′-MDI, 2,4′-MDI, and 4,4′-MDI. The 4,4′ isomer is most widely used, and is also known as 4,4′-diphenylmethane diisocyanate.
In addition to the above, the concentration monitors are ATEX and IECEx approved for use in hazardous areas.