... be highly reliable with high-performance to control the Pump Controller:HARSVERT-A series of Medium Voltage Variable Frequency ... 10V/4-20mA12. Able to operate at either open loop control or closed loop control status with the integrated PID regulator.13. ... .Mining: mortar pumps, fans, etc5. City construction: water supply pump, compressors of large air conditioning, etcIn the above industries, large ...