Automatically switches between Doppler and transit time to determine best technology and calculate accurate flow rates
Utilizes flow-through stainless steel flow sensors
Rugged, all metal construction ensures a long service life in harsh outdoor environments
Simultaneous display of flow rate and accumulated total on a large, easy to read LCD display
Total reset through keypad, RS485 command or momentary contact of a terminal block connection to ground
Modbus command set permits flow rate, total and total reset access
All configuration parameters and flow totals are backed up indefinitely in FLASH memory
Outputs include 4-20 mA, RS485 (Modbus), rate pulse and total pulse

OPERATING PRINCIPLE

The Fusion consistently measures liquid flow by using both Doppler and transit time ultrasonic hardware and algorithms. It automatically determines which principle to use, providing the most accurate measurement for the present conditions of the application. The Fusion’s dual technology is capable of reliably measuring clean, dirty and gassy liquids - Patent Pending. When in transit time mode, the flow meter operates by transmitting and receiving a frequency modulated burst of sound energy between two transducers. The burst is first transmitted in the direction of fluid flow and then against fluid flow (see Figure 1). Since sound energy in a moving liquid is carried faster when it travels in the direction of fluid flow (downstream) than it does when it travels against fluid flow (upstream), a differential in the times of flight will occur. The difference between the two travel times is then used to calculate the flow rate. When in Doppler mode, the flow meter transmits an ultrasonic sound from its transmitting transducer into the flowing liquid. The sound will be reflected by sonic reflectors (gas bubbles or particulate) suspended within the liquid and recorded by the receiving transducer. If the sonic reflectors are moving within the sound transmission path, sound waves will be reflected at a frequency shifted (Doppler frequency) from the transmitted frequency. The shift in frequency will be directly related to the speed of the moving particle or bubble, resulting in a liquid flow rate that is interpreted by the instrument and converted to various user defined measuring units. Fusion retains all user configured data and accumulated flows (totalizers) in non-volatile Flash memory indefinitely.