Dynasonics TFXM Data sheet

Series TFXM

MULTIPLE-PIPE, MULTIPLE-PATH CLAMP-ON ULTRASONIC
FLOW METER FOR LIQUIDS

Series TFXM Multiple-Pipe, Multiple-Path Transit
Time Flow Meters feature advanced non-invasive
flow measurement technology - providing a
measuring system with superior accuracy, versatility,
low cost of installation and low cost of ownership.
The TFXM system installs quickly onto liquid piping
systems with its non-invasive, non-fouling
transducers and can be configured and operational
within minutes. Mathematical formulas can be
applied to discrete flow measurements - up to eight
discrete channels/pipes - to display and output
average flow, flow difference, proportions or sums.

TFXM is designed for indoor and outdoor fixed
installations and is designed to operate on both AC
and DC power sources. The backlit graphics display
provides four lines of user-selected flow information
including rate, totalizer, liquid sound speed and signal
strength - for any meter connected to the TFXM
network. An integral optical interface is used with the
optional Windows
allows simple in-field programming, calibration and
software upgrades. All TFX systems utilize digital
signal processing, cross-correlation, and field
replaceable input/output modules.

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ULTRALINKTM software utility and

A TFXM flow measurement system is a cost effective
versatile investment that can be readily configured for
piping from ½ inch (12 mm) and higher.

FEATURES BENEFITS

Multiple-path, single-pipe installations ensure accurate flow
measurements without the need for long runs of straight pipe.

User configurable rate and totalizer units include: feet, gallons, ft
million-gal, barrels (liquid & oil), acre-feet, lbs, meters, liters, m

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million-liters and kg.

Each measurement channel contains integral 4-20 mA, dual-relay
and RS485 communications. Field replaceable output and
communication module options include: 200,000-event data logger,
rate pulse, and Heatflow/RTD.

Automatic Reynolds Number compensation ensures accurate
measurements through the laminar, transition and turbulent
system flow regions.

Ultralink software utility (free download) enables in-field flow
configuration, calibration and troubleshooting, via laptop PC.

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Non-invasive clamp-on transducers are simple and cost efficient.
Since the transducers do not contact the liquid, fouling, pressure
drop, leaks and maintenance are eliminated.

Reduced installation time: no need to break into pipelines. Meter
can be configured and operational in minutes.

Reduced down-time: installation may be performed on full pipes.
No need to shut the process down for installation
or maintenance.

Low ownership costs: no repair kits, replacement parts, or
ongoing maintenance is necessary.

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www.dynasonics.com800.535.3569

PRINCIPLES OF OPERATION

TFX 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 the 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 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.

PART NUMBER CONSTRUCTION

Series TFXM Series TFXM

Top View

V-Mode Configuration Transit Time

Figure 1

TRANSMITTER-Wall mount bracket kit included

D T F X M D T TN

Channels

1) One Internal Channel

2) Two Internal Channels

Power Supply*
A) 115 VAC
B) 230 VAC

Channel 1 Input/Output

(RS485 is Standard on all Models)

1) 4-20 mA and Dual-Relay

2) Dual-Relay and One Option

3) 4-20 mA and One Option

Channel 1 Option Input/Output
N) None (If “1” is selected previously)

1) 4-20 mA (Secondary)

2) Dual Relay (Secondary)

3) Rate Pulse

6) Data Logger

7) Heatflow/RTD

Channel 2 Input/Output ( TFXM2)
N) None – ( TFXM1)

1) 4-20 mA and Dual Relay

2) Dual Relay and one Option

3) 4-20 mA and One option

Channel 2 Input/Output (TFXM2)
N) None – ( TFXM1 or if “1” is selected previously)

1) 4-20 mA (Secondary)

2) Dual Relay (Secondary)

3) Rate Pulse

6) Data Logger

7) Heatflow/RTD

*All TFXM units will also function in 10-28 VDC

Installation
N) General

Purpose

Options
N) None
2 ) 2 MHz DTTS/DTTC

transducers

TRANSDUCER-Pipes larger than 2" (50 mm)

Construction
N) Standard: +250 °F (+121 °C)

(CPVC, Ultem

H)

High Temp: +350 °F (+176 °C)

(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 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

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

D T T

Type
S)

Standard: +185 °F (+85 °C)

(PVC, Ultem)

High Temp: +250 °F (+121 °C)

C)
(CPVC, Ultem)

Nominal
Pipe Size

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

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Pipe Type
P) ANSI Pipe
C) Copper Pipe
T) Rigid Tubing

Conduit Type
N) None-RG59 Cable
A) Flexible Armored

Installation
N) General Purpose
F) CSA Class I, Div. 1,

Groups C & D

Cable Length

020) 20 feet (6 m)

050) 50 feet (15 m)

100) 100 feet (30 m)

Conduit Type
N) None - RG59 Cable
A) Flexible Armored

Conduit Length

000) None

020) 20 feet (6 m)

050) 50 feet (15 m)

100) 100 feet (30 m)