DescriptionDoppler technology is used to measure the flow rate of liquids with particulate and/or bubbles suspended in it. Transit time technology is used for clean liquids OMEGA’s FDH-1A Series hybrid ultrasonic flow meter allows customers to select between doppler and transit time technology with a single instrument. Isolated analog output, frequency output and the ability to data-log to standard SD cards are standard included features. The FDH-1A is programmed via a menu driven QVGA LCD display with a 5 button interface panel. Optional control functions with relay outputs are optional (-R3). The communications option package (-COMM) gives users RS232, RS485, USB and Ethernet for interfacing to a PC.