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Hybrid Ultrasonic Flow Meter

Item# FDH-1A

Hybrid Ultrasonic Flow Meter FDH-1A FDH-1A
  • Selectable Doppler or Transit Time Operating Mode
  • Quick and Easy Clamp-On Transducer Installation
  • User Programmable Via 5-Button Menu Driven Interface
  • High Quality 320 x 240 Pixel QVGA Backlit LCD
  • Data Logging to Standard SD Card Format
  • Isolated 4 to 20 mA or 0 to 1 Khz Pulse Output (Fully Configurable)
  • Optional Relays and Communications


  • Data Hold Yes
  • Data Logging Date/time stamped flow rate and flow total data in FAT32 file format
  • Display Area Width 320 x 240 pixel
  • Enclosure Material NEMA 4X (IP66)
  • Measurement Type Flow
  • Maximum Ambient Temperature 60 {C} (140 {F})
  • Measurement Units Independently configurable rate and total display units in U.S. Gallons
  • Media Type Virtually any acoustically conductive fluid
  • Memory Type SD Card
  • Minimum Ambient Temperature -10 {C} (14 {F})
  • Number of Display Digits 10
  • Supply Frequency 50/60 Hz
  • Power Source VAC
  • Velocity 0.07 to 9.14 m (0.25 to 30') per second
Doppler 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 flowmeter 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 user’s RS232, RS485, USB and Ethernet for interfacing to a PC

Communications Options Any FDH-1 can be equipped with a communications package (-COMM) that includes Ethernet, USB, RS232, and RS485 connections, and proprietar user PC Software. When connected to a PC running the software, the user can access the configuration menu for program editing and data logging downloads directly into a PC. The software user interface mimics the 5-button touch pad so learning to use the software application is simple. Simply clicking on the buttons is the same as pressing the buttons on the FDH-1 touch pad. Pressing and holding shift while clicking on a button simulates pressing and holding a button on the touch pad.
Process Control Options Any FDH-1 model can be equipped with a process control relay package (-R3) that includes three independently programmable 10 A relays. Each relay can be configured to respond to changes in either the measured rate of flow or the accumulated total flow value. When assigned to monitor flow rate, high/low/ range rate alarms are possible. When assigned to monitor accumulated total, manual trigger batch operations or automatically triggered, timed batch (proportional feed) operations are possible.
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