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