... , viscosity, temperature, pressure and conductivity, and the signal output of inductive voltage is linear to average velocity, therefore it has a ... , only 5D for upstream and 3D for downstream due to inductive voltage signal which is the average value in the cross ... with back light Signal Output: Analog 4 ~ 20mA, isolated, load resistor ≤750Ω; Pulse frequency 0 ~ 1kHz, OCT, external power∠35V DC ...