... signal (4∼20)m A correspond to the standard volume flow (0∼Qmax) m3/h, two wiresExternal power DC24VLWQ- ... the double rows LCD screen simultaneously showing the instaneous flow and accumulative flow, the method is as the following:Q ××××(four ... and pressure sensors, and compensating and rectifying calculation for different flow states, simultaneously may inquire the values of temperature, pressure, ...