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
Specifications Measuring Principle: Hybrid; user selectable doppler or transit time operating modes Fluid Types: Virtually any acoustically conductive fluid Transit Time Mode: 0 to 10% (0 to 100,000 ppm) particulate Doppler: 0.02 to 15% (200 to 150,000 ppm) 50 micron particles Fluid Velocity Range: 0.07 to 9.14 m (0.25 to 30') per second Flow Sensitivity: 0.0003 m (0.001') per second Nominal Pipe Sizes: 63 to 2500 mm (2.0 to 100") Enclosure: NEMA 4X (IP66), powder coated aluminum, SS clamps and hardware Dimensions: 279 H x 218 W x 127 mm D (11.00 x 8.60 x 5.00") Weight: 9.5 lb. (4.3 Kg) Mounting: Wall, pipe (vertical or horizontal) or panel mounting. Hardware included Panel Opening: 270 H x 206 W mm (10.63 x 8.10") Panel Depth Rear: 71 mm (2.78") Front: 55 mm (2.18") Power Requirements: 95 to 264 Vac 50/60 Hz or 15 to 30 Vdc; 30 watts max Operating Temperature: -10 to 60°C (14 to 140°F) Storage: -40 to 70°C (-40 to 158°F) Display: 320 x 240 pixel QVGA backlit LCD, UV resistant. Simultaneous rate and Total; 10 digit max + exponent to E+32 decimal location configurable to 10 places Display Languages: English, Spanish, French or German selectable Keypad: Five-button positive action tactile switch keypad Security: Programmable master password and individual configuration passwords Display Volume Units: Independently configurable rate and total display units in U.S. Gallons, ounces, barrels (US liquid), barrels (US oil), cubic ft, acre ft, Imperial (British) gallons, liter, cubic meter, or user defined “custom” units. Rate display in feet or meters per second. Display Time Units: Seconds, minutes, hours, days Display/Output Response Time: Selectable; 0.25, 0.50, 1.0 (default), 2.5, 5.0 seconds Flow Rate Display Averaging: Selectable; 0.50, 1.0, 2.5, 5.0 (default), 10.0 sec Data Outputs: Isolated 4 to 20 mA output fully configurable, invertible; 0 to 1000 Hz pulse output fully configurable, invertible Data Logging: Date/time stamped flow rate and flow total data in FAT32 file format, easily imported into Excel. Configurable to trigger on time interval (1-999,999 sec), rate and/or total set-point values. Over 500,000 log events possible with included 32 MB SD card. Process Control (-R3 option): Three independently configurable 10 amp Form C, NO/NC relays. Configure to flow rate for high/low/ range rate alarm. Programmable release values enable auto release or manual latching operation. Configure to flow total for manual trigger batch operations or automatically triggered, timed batch operations External Communications (-COMM Option): Computer connection via RS232, RS485, USB, Ethernet. Includes user communication and configuration software. Permits remote internet access through local network set-up. Remotely access and upload data logging files Clamp-On Transducers Housing: NEMA 6P (IP67), Plastic transducers (PVDF base housing with Polypropylene cover), SS clamps and hardware Dimensions: 79 H x 75 W x 41 mm D (3.12 x 2.95 x 1.60") Weight (Excluding Cable): 0.8 lb (0.4 kg) each Cable: Shielded coaxial RG/U Type; 59. PVC jacket, black. RoHS Compliant Standard length: 3 m (10') Optional Lengths Available: 15 m (50'), 30 m (100') Pipe Surface Temperature: -34 to 121°C (-20 to 250°F) Shipping Specifications Carton Dimensions: 533 H x 432 W x 241 mm D (21 x 17 x 9.5") Carton Weight: 24 lb (10.9 kg) Note: For fluid, flow stream, minimum straight pipe and mounting requirements see the FDH-1 operator’s manual at: omega.com/manuals
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.
† All dollar amounts on this site are shown in Singapore currency.
Note: Comes complete with mounting hardware, stainless steal clamps, and operator’s manual.
Standard sensor cable length is 10 FT with liquid-tight, non-removable cable gland
For a 5-point NIST calibration, add suffix "-NIST" to the part number, add one week to the lead time; add $460.00 to the cost.
Keywords:hybrid, ultrasonic, flow meter, doppler, transit time, transit-time
