... widely used in many industries such as petroleum, oil refining, food, dairy, paper making, chemicals, ... saline, phosphate, calcium compound, etc.·Oil refiningLubricating oil, aromatics, fuel oil, and vegetable oil, etc.·Food processingTomato juice, grape ... hydroxide, etc.·Petrochemical Natural gas, coal gas, lubricating oil, and oil / water interfaceTechnical parameter·Signal outputTwo wire current 4 ...