Dynasonics TFXD Data sheet

FIXED LOCATION TRANSIT TIME FLOW METER

Series TFXD Transit Time Flow Meters feature
the world’s most advanced non-invasive flow
measurement technology available – providing
a measuring system with superior accuracy,
versatility, low cost of installation and low cost
of ownership. The TFXD system installs quickly
onto liquid piping systems with its non-invasive,
non-fouling transducers and can be configured
and operational within minutes.

The TFXD is designed for fixed-location
installation on liquid systems and is available in
both blind (TFXD1) and display (TFXD2) models.
The TFXD2 has a large LCD and an integral
keypad that allows field configuration without the
use of a computer.
optical interface

ULTRALINK

allows simple in-field programming, calibration
and software upgrades. All systems utilize digital
signal processing, cross-correlation and field
replaceable

which can be used with the

™

software utility. The software utility

input/output

Series TFXD

The TFXD also provides an

modules.

* Optional aluminum track assembly shown.

FEATURES

Non-invasive, NEMA 6P (IP-68) clamp-on transducers are
cost-effective and simple to install. Since the transducers do not
contact the liquid, fouling and maintenance are eliminated.

TFXD has a flow measuring range that is much larger than other
flow meter technologies. This feature allows the instrument to
measure normal process flow rates as well as flows resulting
from leaks in piping and valves.

Inherent flow profile compensation permits increased
accuracy over alternate technologies.

Bi-directional measurements, with totalization in positive,
negative, net or batch modes.

Zero head-loss results in improved pumping efficiency.

The TFXD flow measurement system is a
cost-effective, versatile investment that can be
readily configured for piping ½" (12 mm)
and higher.

Low power consumption. The TFXD system operates on less
than 2.5W, allowing operation on UPS, solar panel and battery
operated power sources.

An integral optical interface and optional Windows

®

software
utility provide complete control of system configuration,
calibration and diagnostics – without opening the NEMA 4X
(IP-66) enclosure.

Field-replaceable I/O module options include: 4-20 mA, dual
relay, rate pulse, RS232C, RS485, 200K-event data logger, and
Heatflow/RTD.

User configurable rate and totalizer units include: feet, gallons,

3

ft

, million-gal, barrels, acre-feet, lbs, meters, liters, m3,

million-liters and kg.

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www.dynasonics.com800.535.3569

PRINCIPLES OF OPERATION

Series TFXD Series TFXD Series TFXD

FIXED LOCATION TRANSIT
TIME FLOW METER

TFXD transit time flow meters utilize two transducers,
shown as elements A and B in Figure 1, which function
as both ultrasonic transmitters and receivers. The
transducers are clamped on the outside of a closed
pipe at a specific distance from each other. (The
transducers can be mounted in V-mode as shown in
Figure 1, W-mode where sound transverses the pipe
four times, or in Z-mode where the transducers are
mounted on opposite sides of the pipe. This selection
is based on pipe and liquid characteristics.) The flow
meter operates by alternately transmitting and receiving
a frequency modulated burst of sound energy between
the two transducers. The burst is first transmitted in the
direction of fluid flow and then against fluid flow. 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. If the fluid is
not moving, the time of flight difference will be zero and

PART NUMBER CONSTRUCTION

TRANSMITTER – Wall mount bracket kit included

Figure 1 Top View

Reflect-Mode Configuration

Transit Time

the flow meter will indicate zero flow. The sound’s time of
flight is accurately measured in both directions and the
difference in time of flight is calculated. The liquid velocity (V)
inside the pipe can be related to the difference in time of
flight (dt) through the following equation:

V = K*D*dt

where K is a constant and D is the distance between
the transducers.

TRANSDUCER – Pipes larger than 2" (50 mm)

D T F X D

Transmitter Type

1) Blind

2) Rate and Totalizer Display

Power Supply

A) 115 VAC
B) 230 VAC
E) 10-28 VDC

Input/Output 1

N) None

1) 4-20 mA

2) Dual Relay

3) Rate Pulse

4) RS232C

5) RS485

6) Data Logger

7) Heatflow/RTD

Input/Output 2

Same as Selecting Input/Output 1

Totalizer

N) (Std on DTFXD1) None
A) (Std on DTFXD2) Eight Digit Resettable

Options

N) None

2)

2 MHz
DTTS
transducer

Installation

N) General Purpose

D T T

Construction

N) Standard (CPVC, Ultem®)
H) High Temp (PTFE, Vespel

Cable Length

020) 20 feet (6 m)

050) 50 feet (15 m)

100) 100 feet (30 m)

Maximum length: 990 feet (300 m)
in 10 ft. (3 m) increments

Conduit Type

N) None - RG59 Cable
A) Flexible Armored

Conduit Length

(Standard Construction: Conduit Length = Cable Length)

000) None

020) 20 feet (6 m)

050) 50 feet (15 m)

100) 100 feet (30 m)

Maximum length: 990 feet (300 m) in 10 ft. (3 m) increments

®

)

Installation

N)

General Purpose
F) CSA Class I Div. 1,
Groups C & D

Small Pipes – ½" to 2" (12 mm to 50 mm)

D T T S

Nominal Pipe Size

D) ½ inch
F) ¾ inch
G) 1 inch
H) 1-¼ inch
J) 1-½ inch
L) 2 inch

Pipe Type

P) ANSI Pipe
C) Copper Pipe
T) Tubing

Conduit Type

N) None - RG59 Cable
A) Flexible Armored

Cable Length

020) 20 feet (6 m)

050) 50 feet (15 m)

100) 100 feet (30 m)

Conduit Length

000) None

020) 20 feet (6 m)

050) 50 feet (15 m)

100) 100 feet (30 m)