Signal modules Vortex flow sensor: HCI module consists of an LCD display and keyboard components, mainly for the vortex flowmeter menu settings, complete real-time display the cumulative flow and instantaneous flow, and through the module on the meter factor and other calibration and to modify parameters. RS485 communication module for the important parameters cumulative flow and instantaneous flow rate, etc. passed to the remote computer, user instant access to information flowmeter. 4-20mA current loop module is used to convert the instantaneous flow values corresponding current signals to facilitate the remote instantaneous flow signals, improved instrument compatibility.