... DN250, DN300, DN350, DN400, DN450, DN500; Applicability: gas (air, oxygen, nitrogen, coal gas, natural gas, chemical gas and ... grade, gas, steam 1.0 grade;Range of flow rate: liquid: 0.6-6 m/s, gas ... when 4-20mA output: +24VDC;Field LCD display: 3.6V No.1 1 lithium cell power supply, working ... : -25°C—+55°C;Material of meter body: 1Cr18Ni9Ti (other materials supplied by agreement). Vortex flow meter