Principle of Operation
Flow in the ForceMeter™ target meter is measured in terms of dynamic force acting on a target in the flow stream. A hermetically sealed strain gauge is bonded in a bridge circuit configuration and mounted outside the flow stream. When force is applied to the target this translates to an electrical output that is proportional to the flow rate.
2-Wire: A 2-wire loop powered meter with a 4-20mA output and HART communication. It has a turndown ratio of 15:1, and is used where 2-wire loop powered is required.
3-Wire: The 3-wire has a power, signal (4-20mA and HART communication), and ground connection. With more power available, the meter produces a higher signal-to-noise ratio, minimizing electrical interference. This increases the turndown ratio to 20:1, allowing lower flow rates to be measured.