Dynasonics TFXP Data sheet

Series TFXP

PORTABLE TRANSIT TIME
FLOW METER

Series TFXP Portable Transit Time Flow Meters
feature the world’s most advanced non-invasive
flow measurement technology – providing a
measuring system with superior accuracy,
versatility, ease of installation and dependability.
Although designed primarily for cleaner liquids,
the flow meter can reliably measure liquids
containing moderate amounts of suspended
solids. TFXP is designed for long- or short-term
flow measurement surveys on full-pipe liquid
systems and is ideal for verifying calibration of
permanently mounted flow meters of all types.

The flow meter features a tactile keypad, 24-hour
battery (rechargeable), removable 200,000-event
data logger (optional) and a 128 x 64 pixel,
back-lit graphics display – all integrated into a
rugged, watertight enclosure. TFXP systems
utilize Dynasonics’ proprietary dual time-base
time expansion algorithm, advanced DSP and
digital cross-correlation. TFXP also provides an
optical interface that allows operation of the

Windows
software utility allows simple in-field programming,
calibration and software upgrades.

®

ULTRALINK™ software utility. The

FEATURES

A removable 200,000-event data logger
connection that plugs directly into a PC serial port for very fast

57.6K data uploads.

Integral 24-hour rechargeable battery allows extended
operation when AC power is not available. Both AC and “auto”
socket style power adapters (battery chargers) are included.

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

TFXP 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.

E

R

D

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F

E

N

I

C

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I

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O

9

0

0

1

:

2

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D

I

N

C

.

6

5

8

6

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has an integral DB-9

The cost-effective and versatile TFXP flow meter
comes complete with all accessories necessary
for measuring piping systems larger than 2" (50 mm).

Non-invasive clamp-on transducers are simple and cost­efficient to install. Since the transducers do not contact the
liquid, fouling and maintenance are eliminated.

User-configurable rate and totalizer units include: feet,
gallons, ft
m

An integral optical interface and optional Windows

3

3

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

, million-liters and kg.

®

software
utility provide complete control of system configuration,
calibration and diagnostics – without connecting any wires.

Compartmentalized and padded carrying case keeps the TFXP
meter and all of its accessories organized and protected.

TM

www.dynasonics.com800.535.3569

PRINCIPLES OF OPERATION

Series TFXP Series TFXP Series TFXP

PORTABLE
TRANSIT TIME FLOW METER

TFXP 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.

Figure 1 Top View

Reflect-Mode Configuration

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:

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

Transit Time

V = K*D*dt

PART NUMBER CONSTRUCTION

D T F X P

Power Supply

A) 115 VAC
B) 230 VAC European

(Two Round Terminals)

C) 100 VAC
G) 230 VAC U.K.

(Three Rectangular
Terminals)

Output 1*

1) 4-20 mA (Std.)

A

Output 2

N) None (Std.)

6) 200,000 event

Data Logger

Installation

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

Groups C & D**

Options

N) None
H) DTTH High Temperature Transducers

2) DTTS Small Pipe Transducers

-pipe sizes ½" (12 mm) to 2" (50 mm)**

* Additional input/output options are available. Consult the local sales rep or the Dynasonics factory.
** Consult factory when ordering.