... of occupation standard density. Continuous on – line measurement without interruption. Able to directly use in the industrial control.Safe and ... .·Diary Refining of milk, milk sugar, cheese, and lactic acid, etc.·MiningCoal, potash, saline, phosphate, calcium compound, etc ... Natural gas, coal gas, lubricating oil, and oil / water interfaceTechnical parameter·Signal outputTwo wire current 4 – 20 mA + ...