... .·Mining Coal, potash, saline, phosphate, calcium compound, etc.·Oil refiningLubricating oil, aromatics, fuel oil, and vegetable oil, etc.·Food processingTomato juice, grape juice, lemon juice ... chloride, sodium hydroxide, etc.·Petrochemical Natural gas, coal gas, lubricating oil, and oil / water interface Technical parameter·Signal outputTwo wire current 4 – 20 ...