Omega Products FDT-81 User Manual

TRANSIT TIME ULTRASONIC
FLOWMETER

FDT-81

Standard

FDT-81 shown
smaller than
actual size.

Comes with AC and

automobile power adaptors,

compartmentalized padded

carrying case, coupling

grease, standard sensors,

straps, cables, mounting

track, and complete

operators manual.

U Automatic Reynolds Number

Compensation

U 24 Hour Integral Rechargeable Battery
U AC and Automobile Power

Adaptors Included

U User-Configurable Rate

and Totalizer Units

U Designed for Clean and

Ultraclean Liquids

U Non-Invasive Clamp-on Transducers

The FDT-80 Series of portable transit time flowmeters
feature the world’s most advanced non-invasive flow
measurement technology, providing a measuring system
with unsurpassed accuracy, versatility, ease of
installation and dependability. Although designed
primarily for cleaner liquids, the flowmeter can also
reliably measure liquids containing moderate amounts
of suspended solids or aeration.

FDT-80 is designed for long or short term flow
measurement surveys on full-pipe liquid systems
and is ideal for verifying calibration of permanently
mounted flowmeters of all types. The flowmeter
features a tactile keypad, 24-hour battery (rechargeable),
and a 128 x 64 pixel, back-lit graphics display–all

integrated into a rugged, watertight enclosure. The
FDT-80 systems utilize proprietary dual time-base time
expansion algorithm, advanced DSP and digital
cross-correlation. The cost effective and versatile
FDT-80 flowmeter comes complete with all accessories
necessary for measuring piping systems from
50 to 2540 mm (2 to 100").

FDT-80 Series has a flow measuring range that
exceeds 4000:1. This feature allows the instrument to
measure normal process flow rates as well as flows
resulting from leaks in piping and valves.

User configurable rate and totalizer units include: feet,
gallons, ft
liters, m3, million-liters and kg. Non-invasive clamp-on
transducers are simple and cost efficient to install.
Since the transducers do not contact the liquid, fouling
and maintenance are eliminated.

Automatic Reynolds Number compensation assures
accurate measurements through the laminar, transition
and turbulent system flow regions. An integral 24 hour
rechargeable battery allows extended operation when
AC power is not available. Both AC and cigarette socket
style power adaptors (battery chargers) are included.
Compartmentalized and padded carrying case keeps
the FDT-80 meter and all of its accessories organized
and protected.

3

, million-gal, barrels, acre-feet, lbs, meters,

E-5

FDT-81 shown smaller

than actual size.

SPECIFICATIONS

Transmitter

Power Requirements: Internal 12V

lead-acid gel cell battery provides 24 hrs
of continuous operation @ 20°C (68°F)
Charging: Wall mount power converter,
115 or 230 Vac 50/60 Hz ±15% @
5 VA maximum; 12 to15 Vdc @

2.5 VA maximum
Velocity: -12 to +12 MPS
(-40 to +40 FPS)
Outputs: All output modules are
optically isolated from earth and system
grounds. A maximum of two modules
may be installed
Analog Output: 4 to 20 mA, 800Ω
maximum; 12-bit resolution; passive
or active
Other Options: Pulse output MOSFET,
dual form C relays, heat flow and high
temperature, and small pipe sensors
(consult Engineering for details)
Display: 128 x 64 pixel graphics LCD,
LED back lit. Two user selectable font
sizes: 8.9 or 5.0 mm (0.35 or 0.2")
8-digit rate, 8-digit totalizer (resettable)
Units: Feet, gallons, ft
acre-feet, lbs., meters, liters, m
mil-liters, kg (with Heatflow option:
BTUs, calories, watts tons) [rate time:
sec, min, hr, day]; Totalizer (NET, FWD,
REV or BATCH): gallons, ft
acre-feet, lbs., liters, m
flow option: BTUs, calories,
watts tons) (user configured)

3

, mil-gal, barrels,

3

3

,

3

, barrels,

, kg (with Heat-

Ambient Conditions: -40 to 85°C
(-40 to 185°F), 0 to 95% relative
humidity, non-condensing
Enclosure: NEMA 4X (IP-66) while
open, NEMA 6 (IP68) while closed,
ABS with SS hardware
Electronic Enclosure: 14.8 lbs
(6.7 kg), 356 W x 154 H x 268 mm D
(14 x 6.06 x 10.56")
Accuracy Flow Rate: ±1.0% of reading
at rates > 1 FPS
Sensitivity Flow: 0.0003 MPS
(0.001 FPS)

Repeatability: ±0.3% of reading
Response Time Flow:

0.3 to 30 seconds, user configured,
to 100% of value, step change in flow.
Security keypad lockout, 4-digit user
selected access code

Approvals: Ordinary area
Cable: 6.1 m (20')
Pipe Sizes: 50 to 2540 mm (2 to 100")
Pipe Temperature: -40 to 121°C

(-40 to 250°F); NEMA 6 (IP68) housing
Material Standard Sensor: CPVC,

®

and Nylon

Ultem

To Order Visit omega.com/fdt-81 for Pricing and Details

Model No. Description

FDT-81 Transit-time flowmeter

Accessories

Model No. Description

FDT-81-STD Replacement standard sensor
FDT-GREASE Coupling grease for fdt-30/80 Series

Comes complete with AC and automobile power adaptors, carrying case, coupling grease,
standard sensors, straps, cables, mounting track, NIST certificate, and operator’s manual.

High temp and small pipe models are available, consult Flow Engineering for details.
Ordering Example: FDT-81, complete transit time ultrasonic flowmeter kit, and FDT-GREASE,

coupling grease.

E-6

E