... density, viscosity, temperature, pressure and conductivity, and the signal output of inductive voltage is linear to average velocity, ... upstream and 3D for downstream due to inductive voltage signal which is the average value in the cross- ... flowrate, total flow, velocity, flowrate percentage with back light Signal Output: Analog 4 ~ 20mA, isolated, load resistor ≤750Ω; Pulse frequency 0 ~ 1kHz, ...