... Flowmeter medium: petroleum, high water-content crude oil, low/middle/high viscocity petrochemical etc. The Positive ... -acid pH liquids; -liquefied petroleum gas(LPG); -crude oil, also for heated and/or viscous liquids; -oil or water based latex products, ... 1.6, 2.5, 4.0, 6.3medium: petroleum, high water-content crude oil, low/middle/high viscocity petrochemical & chemical solvents.indicator function ...