The CFI 300 series instruments are extremely rugged and versatile flow indicators with 4-20mA or 0-5V input. These indicators can be used for open channel flow measurement. These instruments can be factory set for measuring 4-20mA currents or 0-5VDC or 0-10VDC. The 4-20mA models have a drop of 2.4 volts maximum. In addition, all these instruments are field programmable and have nonvolatile backup memory that does not need cumbersome batteries. These instruments also have the capability to switch on relay(s) based on user settings. These outputs can be used for process set points and alarms. There is a advanced power fail feature by which even if there is any power failure the Total Flow reading is automatically saved to memory and resumes with the same value after Power On. These instruments can be connected to a PC via RS485/ RS 232 using MODBUS interface