... 20mA12. Able to operate at either open loop control or closed loop control status with the integrated PID regulator.13 ... :1. Power generations: induced draft fans, condensate pumps, water supply pumps, etc2. Metal: dusting fans, furnace fans, ... productions, etc3. Petrochemical and chemical; oil transfer pumps, compressors, pumps, etc4.Mining: mortar pumps, fans, etc5. City construction: water supply ...