... ~20mA,standing for media densityVoltage output: ±0.5VDC,standing for media density.Frequency output: 1 ~10000Hz,standing for flow,Electrical level,0 ... ten years of technical experience and technical research, Our company in traffic technology industry is quite mature,, Intellectual property ... ,natural gas,foodstuff,pharmacy,paper industries etc. The company's products with good quality are well sold all ...