Ark Electric Mechanical Co., Ltd ARK LTD is a professional manufacturer, which specializing in RD, producing various precise metering pump, flow sensor, industrial online monitoring and control instruments and dosing control system. ARK LTD is committing itself to provide excellent products and service in such fields as waste water treatment, pure water process and water purification project, petrochemical industry, food and beverage, electrical power, metallurgy, pharmacy, paper making, printing and dyeing, bioengineering and environment detection.