... abrasion,SS shell 1. Introduction Digital / intelligent vortex flow meter with pulse air/ gas /liquid measuring instrument / tool is an internationally ... advanced new type of flow meter, it is developed based on Karman Vortex Street Theory ... 12~24V DC, 3.6V Lithium batterySignal Output:Standard current, 4~20mA;Voltage pulse, low level1V, high level6V, load resistor150Display ...