Dynasonics TFXD Operating Manual

Series TFXD

Transit Time Ultrasonic Flow Meter

Operations & Maintenance

Manual

REV 5/07

TABLE OF CONTENTS

Part 1 -
Introduction

Connections
and Wiring

Quick-Start Operating Instructions 1.3-1.5

Introduction

General 1.6
Applications 1.6
Product Matrix 1.7

Product Specifications 1.8

Transmitter Installation 1.9-1.10
Transducer and Power Connections 1.11-1.14
Input/Output Connections

General 1.15
4-20 mA Output 1.16
Dual Control Relays 1.17

Pages

Part 2 ­Transducer
and RTD
Installation

Rate Pulse Output 1.18
RS232C 1.19
RS485 1.20

Data Logger 1.21
Heat Flow 1.22-1.23
Startup and Configuration 1.24

General 2.1
Mounting Location 2.2
Transducer Spacing 2.3-2.7
Transducer Mounting, Pipe Preparation 2.8
Transducer Mounting, V-Mount and W-Mount 2.9-2.11
Transducer Mounting, DTTS Small-pipe 2.12
Transducer Mounting, Z-Mount 2.13-2.15
Mounting Track Installation 2.16-2.17
RTD Installation 2.17-2.19

Rev. 5/07 -1.1- TFXD

TABLE OF CONTENTS

Part 3 ­Programming

Part 4 ­Software
Utilities

General Programming Information 3.1-3.2
BASIC MENU 3.3-3.13
OUTPUT MENU 3.14-3.21
SENSOR MENU 3.22
SECURITY MENU 3.22
SERVICE MENU 3.23-3.28

Liquid Sound Speed 3.23

Signal Strength 3.23

Temperature Values 3.25

Setting ZERO Flow 3.27

Correction Factor Entry 3.28
DISPLAY MENU 3.28-3.29

Software Utility Operation

UltraLink™

Data Logger 4.21-4.24

Pages

4.1-4.21

Appendix

Rev. 5/07 -1.2- TFXD

Appendix

Keypad Interface Map

Fluid Characteristic Table

TFX Error Codes

Digital Communications Protocol

Pipe Dimension Chart: ST, SS, PVC

Pipe Dimension Chart: Ductile Iron

Pipe Dimension Chart: Copper

Pipe Dimension Chart: Cast Iron

Velocity to Volumetric Conversion

Statement of Warranty/Terms & Conditions

Customer Service

QUICK-START OPERATING INSTRUCTIONS

Transducer
Location

This manual contains detailed operating instructions for all aspects
of the TFX instrument. The following condensed instructions are
provided to assist the operator in getting the instrument started up
and running as quickly as possible. This pertains to basic operation
only. If specific instrument features are to be used or if the installer
is unfamiliar with this type of instrument, refer to the appropriate
section in the manual for complete details.

1. TRANSDUCER LOCATION

A. In general, select a mounting location on the piping system

with a minimum of 10 pipe diameters (10 x the pipe inside
diameter) of straight pipe upstream and 5 straight diameters
downsteam. See Table 2.1 on page 2.4 for additional
configurations.

B. Select a mounting method for the transducers, based on pipe

size and liquid characteristics. See Table 2.2 on page 2.5.
Transducer configurations are illustrated in Figure 1.1.

1

Nominal values for these

parameters are included
within the TFX operating
system.

The nominal values may

be used as they appear or
may be modified if exact
system values are known.

C. Enter the following data into the TFX transmitter via the

integral keypad or UltraLink™ software utility.

1. Transducer mounting method

2. Pipe O.D. (outside diameter)

3. Pipe wall thickness

4. Pipe material

5. Pipe sound speed

6. Pipe relative roughness

1

1

7. Pipe liner thickness

8. Pipe liner material

9. Fluid type

10. Fluid sound speed

11. Fluid viscosity

12. Fluid specific gravity

1

1

1

D. Record the value calculated and displayed as Transducer

Spacing/XDCR SPC.

Figure 1.1

Transducer Mounting Configurations

Rev. 5/07 -1.3- TFXD

QUICK-START OPERATING INSTRUCTIONS

Connections

2. TRANSDUCER/POWER CONNECTIONS

A. Route the transducer cables from the transducer mount

loc ation back to the TFX enclosure. If additional cable and
connections are required, ensure that they are RG59 75 Ohm
compatible. Connect the transducer wires to the terminal
block J4 in the TFX enclosure. A wiring diagram is located on
the inner door label.

NOTE: The transducer cable carries low level, high frequency
signals. In general, it is not recommended to add additional cable to
the cable supplied with the DTTN, DTTH or DTTS transducers. If
additional cable is required, contact the Dynasonics factory to
arrange an exchange for a transducer with the appropriate length of
cable. Cables to 990 feet [300 meters] are available. If additional
cable and connections are added, ensure that they are RG59
75

Ohm compatible.
B. Verify that power supply jumpers are properly configured.

Reference the wiring diagram located on the TFX inner door.
Connect power to the TFX flow meter.

3. PIPE PREPARATION AND TRANSDUCER MOUNTING
DTTN and DTTH Transducers

A. Place the flow meter in signal strength measuring mode. This

value is available on the TFXD2 display (Service Menu) or in
the Data display of the UltraLink™ software utility.

B. The piping surface, where the transducers are to be mounted,

must be clean and dry. Remove loose scale, rust and paint
to ensure satisfactory acoustical bonds. Grind rough
surfaces of pipes to smooth bare metal. Plastic pipes do not
require preparation other than cleaning.

C. Apply a single 1/2" [12 mm] bead of couplant grease to the

upstream transducer and secure it to the pipe with a
mounting strap.

D. Apply acoustic couplant grease to the downstream transducer

and press it onto the pipe using hand pressure at the lineal
distance calculated in Step 1.

E. Move the transducer slowly around the mount area until the

highest signal strength is observed. Secure with a mounting
strap at this location.

Rev. 5/07 -1.4- TFXD

QUICK-START OPERATING INSTRUCTIONS

Startup

DTTS Transducers

A. Place the flow meter in signal strength measuring mode.

This value is available on the TFXD2 display (Service Menu)
or in the Data display of the UltraLink™ software utility.

B. The pipe surface, where the transducers are to be mounted,

must be clean and dry. Remove loose scale, rust and paint
to ensure satisfactory acoustical bonds. Grind rough
surfaces of pipes to smooth bare metal. Plastic pipes do not
require preparation other than cleaning.

C. Apply a single 1/2" [12 mm] bead of acoustic couplant grease

to the top half of the transducer and secure it to the pipe with
bottom half or U bolts.

D. Tighten the wing nuts so that the grease begins to flow out

from the edges of the transducer and from the gap between
the transducer halves. Do not over tighten.

4. INITIAL SETTINGS AND POWER UP

A. Verify that SIG STR is greater than 2.0%.
B. Verify that measured liquid SSPD is within 3% of the

configuration value.

C. Input proper units of measure and I/O data.

Rev. 5/07 -1.5- TFXD

PART 1 - INTRODUCTION

General

Application
Versatility

The TFXD ultrasonic flow meter is designed to measure the fluid
velocity of liquid within closed conduit. The transducers are a non­contacting, clamp-on or clamp-around type, which will provide
benefits of non-fouling operation and ease of installation.

The TFX family of transit time
flow meters utilize transducers
that function as both ultrasonic
transmitters and receivers.
DTTN and DTTH transducers
are clamped on the outside of a
closed pipe at a specific distance
from each other. The transducers can be mounted in V-Mount
where the sound transverses the pipe two times, W-Mount where
the sound transverses the pipe four times, or in Z-Mount where the
transducers are mounted on opposite sides of the pipe and the
sound crosses the pipe once. This selection is based on pipe and
liquid characteristics.

DTTS (Small Pipe Transducers) have both transmit and receive
crystals imbedded in a single clamp-around transducer so no
measurement between transducers is required.

The flow meter operates by alternately transmitting and receiving a
frequency modulated burst of sound energy between the two
transducers and measuring the time interval that it takes for sound
to travel between the two transducers. The difference in the time
interval measured is directly related to the velocity of the liquid in the
pipe.

The TFXD flow meter can be successfully applied on a wide range
of metering applications. The simple-to-program transmitter
allows the standard product to be used on pipe sizes 1/2 inch
[12

mm] and larger. (Transducers sets from 1/2 to 1-1/2 inch
require 2 MHz transmitters and dedicated pipe transducers.) A
variety of liquid applications can be accommodated:

ultrapure liquids sewage cooling water
potable water reclaimed water river water
chemicals plant effluent others

Because the transducers are non-contacting and have no moving
parts, the flow meter is not affected by system pressure, fouling or
wear. The DTTN transducer set is rated to a pipe surface

Rev. 5/07 -1.6- TFXD

PART 1 - INTRODUCTION

temperature of 300 °F [150 °C]. High temperature DTTH transducers
can operate to a pipe surface temperature of 380 °F [193 °C].
The DTTS series of small pipe transducers can be used to a
pipe surface temperature of 185

°F

[85 °C].

User Safety

Data Integrity

Product
Identification

Transmitter

The TFX employs modular construction and provides electrical
safety for the operator. The display face contains voltages no
greater than 10 Vdc. The display face swings open to allow access
to user connections. Disconnect electrical power before opening the
instrument enclosure.

Non-volatile FLASH memory retains all user-entered configuration
values in memory for several years (at 25 °C), even if power is lost
or turned off. Password protection is provided as part of the
Security menu and prevents inadvertent configuration changes or
totalizer resets.

The serial number and complete model number of the TFX is
located on the inside of the transmitter’s front cover. Should
technical assistance be required, please provide the Dynasonics
Customer Service Department with this information.

Product Matrix

Rev. 5/07 -1.7- TFXD

PART 1 - PRODUCT SPECIFICATIONS

TRANSMITTER

Power Requirements 115/230 VAC 50/60 Hz ±15% at 5 VA max or 10-28 VDC at 3.0 W
Velocity Range
Input/Output Bays 2

Options All modules optically isolated from earth and system ground

4-20 mA 800 Ohm max; 12-bit resolution, internal or external power
Dual Relay 2 separate Form C relays, 200 VAC max at 0.5 A [resistive]
Rate Pulse Open collector, 0 to 2,500 Hz max; 1.0 A max
RS232C Data rate to 57.6k
RS485 Supports up to 126 drops on a two-wire network
Data Logger 200k events in 30k pages, 16-bit, integral DB-9 RS232C connection
Heat Flow (RTD) Supports two 1000 Ohm RTDs, multiplexed, 12-bit resolution

Display
(DTFXD2 only)

Units User configured

Rate Gal, liters, million gal, ft³, m³, acre-ft, oil barrels [42 gal], liquid barrels [31.5 gal], ft, m, lb, kg, BTU, MBTU,

Time Seconds, minutes, hours, days
Totalizer Gal, liters, million gal, ft³, m³, acre-ft, oil barrels [42 gal], liquid barrels [31.5 gal], lb, kg, BTU, MBTU, MMBTU,

Mode Forward, reverse, net, batch
Ambient Conditions
Enclosure NEMA 4X [IP-66], polycarbonate, SS, brass, plated steel
Size
Flow Rate Accuracy ±1% of reading for velocities >

Flow Sensitivity 0.001 FPS [0.0003 MPS]
Repeatability ±0.01% of reading
Response Time (Flow) 0.3 to 30 seconds, user configured, for 10% to 90% step change in flow
Security Keypad lockout, user selected 4 digit access code
Approvals Ordinary areas
Software UltraLink™, compatible with Window

-40

to

+40

FPS [-12 to +12 MPS]

2 line x 8 character backlit LCD; 8 digit rate, 8 digit re-settable totalizer

Top row: 7 segment, 0.7" [18 mm] high, numeric
Bottom row: 14 segment, 0.35" [9mm] high alpha-numeric

MMBTU, kJ, kCal, ton

kJ, kCal, ton

-40

°F to +185 °F

7.00" H × 5.75" W × 3.88" D [178 mm H × 146 mm W × 99 mm D]

±0.1 FPS [0.03 MPS] for velocities < 1 FPS [0.3 MPS]

[-40

°C to

+85

°C], 0 to 95% relative humidity [non-condensing]

1 FPS [0.3 MPS]; ±0.5% of reading for field calibrated units

®

95/98/2000/XP

TRANSDUCERS

Liquid Types Most non-aerated, clean liquids
Cable Length Up to 990 ft [300 meters]; standard lengths 20, 50, 100 ft [6, 15, 30 meters]
Pipe Sizes DTTN / DTTH: 2 inch and larger

Environment NEMA 6
Pipe Surface

Temperature

Ambient Conditions
Housing Material DTTN: CPVC, Ultem

Approvals Standard: None

DTTS [small pipe]: 1/2", 3/4", 1", 1-1/4", 1-1/2" [ANSI pipe, copper tube, tube]

DTTN:

-40
DTTS:
DTTH:

-40

DTTS: PVC, Ultem
DTTH: PTFE, Vespel

Optional - DTTN only: CSA Class I, Div 1, Groups C & D; requires intrinsically safe transducer kit with barrier

°F to +300 °F

-40

°F to +185 °F

-40

°F to +380 °F

°F to +185 °F

[-40

°C to +150 °C]

[-40

°C to

[-40

[-40

°C to

®

, and nylon

®

, and nylon

®

, and nickel-plated brass

+85

°C to +193 °C]

+85

°C]

°C]

Rev. 5/07 -1.8- TFXD

PART 1 - TRANSMITTER INSTALLATION

Transmitter
Installation

After unpacking, it is recommended to save the shipping carton and
packing materials in case the instrument is stored or reshipped.
Inspect the equipment and carton for damage. If there is evidence
of shipping damage, notify the carrier immediately.

The enclosure should be mounted in an area that is convenient for
servicing, calibration or for observation of the LCD readout (if so
equipped).

1. Locate the transmitter within the length of transducer cable that
was supplied with the TFXD system. If this is not possible, it is
recommended that the cable be exchanged for one that is of
proper length.

NOTE: The transducer cable carries low level, high frequency
signals. In general, it is not recommended to add additional cable to
the cable supplied with the DTTN, DTTH or DTTS transducers. If
additional cable is required, contact the Dynasonics factory to
arrange an exchange for a transducer with the appropriate length of
cable. Cables to 990 feet [300 meters] are available. If additional
cable and connections are added, ensure that they are RG59
75

Ohm compatible.

2. Mount the TFX transmitter in a location that is:

• Where little vibration exists.

• Protected from corrosive fluids.

• Within ambient temperature limits -40 to 185 °F [-40 to 85 °C].

• Out of direct sunlight. Direct sunlight may increase tr ansm itte r

temperature to above the maximum limit.

3. Mounting: Refer to Figure 1.2 on page 1.10 for enclosure and
mounting dimension details. Ensure that enough room is
available to allow for door swing, maintenance and conduit
entrances. Secure the enclosure to a flat surface with four
appropriate fasteners.

4. Conduit holes: Conduit hubs should be used where cables enter
the enclosure. Holes not used for cable entry should be sealed
with plugs.

Rev. 5/07 -1.9- TFXD

PART 1 - TRANSMITTER INSTALLATION

Figure 1.2

TFX Transmitter Installation Dimensions

Rev. 5/07 -1.10- TFXD

PART 1 - TRANSDUCER AND POWER CONNECTIONS

NOTE: Use NEMA 4 [IP-65] rated fittings/plugs to maintain the
watertight integrity of the enclosure. Generally, the left conduit hole
(viewed from front) is used for line power; the center conduit hole for
transducer connections and the right hole is utilized for ISO-MOD
I/

O wiring.

5. If additional holes are required, drill the appropriate size hole in
the enclosure’s bottom. Use extreme care not to run the drill bit
into the wiring or circuit cards.

Transducer
Connections

Transmitter
Power
Connections

To access terminal strips for electronic connectors, loosen the two
screws in the enclosure door and open the door.

1. Guide the transducer terminations through the transmitter
conduit hole located in the bottom-center of the enclosure.
Secure the transducer cable with the supplied conduit nut (if
flexible conduit was ordered with the transducer).

2. The terminals within the TFX are a pluggable type – they can be
removed, wired and then plugged back in. Connect the
appropriate wires to J4 at the corresponding screw terminals in
the transmitter. Observe UP/DN Str Xdcr orientation. See
Figure 1.3 on page 1.12 and Figure 1.4 on page 1.13 or the
wiring diagram located on the inner door of the transmitter.

NOTE: The transducer cable carries low level high frequency
signals. In general, it is not recommended to add additional cable to
the cable supplied with the DTTN, DTTH or DTTS transducers. If
additional cable is required, contact the Dynasonics factory to
arrange an exchange for a transducer with the appropriate length of
cable. Cables to 990 feet [300 meters] are available. If additional
cable and connections are added, ensure that they are RG59
75

Ohm compatible.

Connect power to the screw terminal block marked J2 in the TFX
transmitter. See Figure 1.3 and Figure 1.4. Utilize the conduit hole
on the left side of the enclosure for this purpose. Use wiring
practices that conform to local and national codes (e.g., The
National Electric Code Handbook in the U.S.)

CAUTION: Any other wiring method may be unsafe or cause
improper operation of the instrument.

Rev. 5/07 -1.11- TFXD

PART 1 - TRANSDUCER AND POWER CONNECTIONS

NOTE: This instrument requires clean electrical line power. Do not
operate this unit on circuits with noisy components (i.e., fluorescent
lights, relays, compressors, or variable frequency drives). It is
recommended not to run line power with other signal wires within
the same wiring tray or conduit.

AC POWER CONNECTIONS

Figure 1.3

TFXD Wiring Diagram

Rev. 5/07 -1.12- TFXD

PART 1 - TRANSDUCER AND POWER CONNECTIONS

AC Power
Supply

1. Verify that the jumpers at JP3 are properly oriented for the power
supply. Verify that the jumpers at JP1 and JP2 are not present.

2. Connect L1, L2 and earth to the terminals referenced in Figure

1.3 on page 1.12. Phase and neutral connections to L1 and L2 are
not polarized. Do not operate without an earth ground
connection.

3. See Figure 1.4 for AC connection schematic. Wire gauges up to
14 AWG can be accommodated in the TFX terminal blocks.

Figure 1.4

AC Power Connection

Rev. 5/07 -1.13- TFXD

PART 1 - TRANSDUCER AND POWER CONNECTIONS

DC Power
Supply

DC POWER CONNECTIONS

The TFX may be operated from a 9-28 Vdc source, as long as the
source is capable of supplying a minimum of 3 Watts.

1. Verify that the jumpers are properly placed. See the wiring
diagram located on the inside door of the TFX enclosure or see
Figure 1.3 on page 1.12. The jumpers at JP3 should not be
present and the jumpers at JP1 and JP2 will be in place. The
jumper located beneath the microprocessor protection shield –
the panel with the wiring diagram label mounted on it – should be
positioned at JP2 for 9-16 Vdc input power and in JP1 position
for 16-28 Vdc input power.

2. Connect the DC power source as illustrated in the schematic in
Figure 1.5. Wire up to 14 AWG can be accommodated in the
TFX terminal blocks.

Figure 1.5

DC Power Connection

Rev. 5/07 -1.14- TFXD

PART 1 - INPUT/OUTPUT CONNECTIONS

General

The TFXD utilizes ISO-MODs for input and output functions. ISO­MODs are epoxy encapsulated electronic input/output modules that
are simple to install and replace in the field. See Figure 1.6. All
modules are 2,500 V optically isolated from TFXD power and earth
grounds. This eliminates the potential for ground loops and reduces
the chance of severe damage in the event of an electrical surge.

Seven ISO-MOD options are available, including: 4-20 mA, dual­relay, rate pulse, RS232C, RS485, BTU and 200k point data logger.
The TFXD supports any two ISO-MOD input/output modules. All
modules are field configurable by utilizing the keyboard or

UltraLink™ interface. Field wiring connections to ISO-MODs are

quick and easy using removable plug-in terminals. Configuration
and connection of the various ISO-MODs are described on the
following pages.

ISO-MOD
Replacement

Figure 1.6
Two ISO-MOD I/O
Modules Installed

To remove an ISO-MOD, remove the two machine screws that
sec ure the module in place and pull the module straight out of the
enclosure. A 10-pin connection is on the bottom of the module that
mates with the circuit board underneath. Installation of a module is
simply the reverse operation of removal. 4-20 mA modules will
require calibration parameters to be entered if the module is
replaced. See Part 3 of this manual for instructions on entry of
calibration parameters.

Rev. 5/07 -1.15- TFXD

PART 1 - INPUT/OUTPUT CONNECTIONS

4-20 mA
Output

The 4-20 mA Output Module interfaces with most recording and
logging systems by transmitting an analog current signal that is
proportional to system flow rate. The 4-20 mA ISO-MOD may be
configured via jumper selections for either an internally powered
mode (current sourcing) Figure 1.7A or externally powered mode
(current sinking) Figure 1.7B.

Internal Power Configuration: Ensure that jumpers are in place
at JP1 and JP2 on the module. See Figure 1.7A. In this
con figur ation the 4-20 mA output is driven from a +24 Vdc source
located within the TFX flow meter. The 24 Vdc source is isolated
from DC ground and earth ground connections within the TFX
instrument. The module can accommodate loop loads up to 800
Ohms in this configuration.

NOTE: The +24 internal supply, if configured to power the 4-20 mA
output, shares a common ground with another ISO-MOD (if
ins t a ll e d). If another module is connected to earth ground, as is the
case with a PC connection to an RS232 module or data logger, a
ground loop may occur. The solution to this problem is to configure
the 4-20 mA module for external power and utilize an external
isolated supply to power the 4-20 mA loop.

External Power Configuration: Remove the two jumpers located
at JP1 and JP2 on the module. See Figure 1.7B. In this
configuration the 4-20 mA module requires power from an external
DC power supply. The voltage of the external power source must

Figure 1.7A

Internally Powered

4-20mA

Figure 1.7B

Externally Powered

4-20mA

Rev. 5/07 -1.16- TFXD

Control
Relays

PART 1 - INPUT/OUTPUT CONNECTIONS

be sufficient to power the module and drive the loop load. The loop
loss attributed to the ISO-MOD is 7 Vdc, so the minimum voltage
required to power a loop can be calculated using the following formula:

Loop voltage (min) = (loop load Ohms x 0.02) + 7

Two independent SPDT (single-pole, double-throw) Form C relays
are contained in this module. The relay operations are user
configured via software to act in either a flow rate alarm, signal
strength alarm or totalizer/batching mode. The relays are rated for
200 Vac maximum and have a current rating of 0.5 A resistive load
[175 Vdc @ 0.25 A resistive]. It is highly recommended that a
secondary relay be utilized whenever the Control Relay ISO-MOD is
used to control inductive loads such as solenoids and motors.

Typical relay connections are illustrated in Figure 1.8A. The reed
relays located within the relay module can interface directly with
small pilot lights, PLCs, electronic counters and SCADA systems.

Figure 1.8B describes the connection of an external power relay to
the Relay ISO-MOD. It is recommended that external power relays
are utilized whenever the load to be switched exceeds the switch
rating of the reed relays, or if the load is inductive in nature.

Figure 1.8A

Typical Relay

Connections

Figure 1.8B
Slave Relay

Connections

POWER
SOURCE

Rev. 5/07 -1.17- TFXD

PART 1 - INPUT/OUTPUT CONNECTIONS

Rate Pulse

The Rate Pulse Output Module is utilized to transmit information to
external counters and PID systems via a frequency output that is
proportional to system flow rate. The frequency output range of the
Rate Pulse Module is 0–2,500 Hz. This module has two types of
outputs: one simulates the output of the coil of a turbine flow meter,
and the other is an open-collector type that does not source voltage
at its output. Both outputs may be connected simultaneously.

The turbine meter output creates a 500 mV peak-to-peak saw-tooth
waveform that is not referenced to ground. This output can be run
to electronic monitors that are compatible with variable reluctance
outputs from coils, such as those found in turbine and paddle-wheel
flow meters. The input impedance of the receiving device should
not be smaller than 2,000 Ohms.

The standard pulse output does not output a voltage, but acts as an
“open-collector” output requiring an external power source and pull­up resistor. See Figure 1.9. The MOSFET in the Rate Pulse
Module can support loads of 100 V @ 1A. Resistor selection is
based on the input impedance of the receiving device. Select a
resistor that is a maximum of 10% of the input impedance of the
receiving device, but do not exceed 10k Ohms.

Figure 1.9

Rate Pulse Module

Rev. 5/07 -1.18- TFXD

PART 1 - INPUT/OUTPUT CONNECTIONS

RS232C

The RS232C Module will interface with the serial communication
ports of PCs, PLCs and SCADA systems that are used to monitor
flow rate information in piping systems. A proprietary digital
communications protocol is used for this communication. An
explanation of the command structure is detailed in the Appendix of
this manual. Flow rate, total, signal strength and temperature (if so
equipped) can be monitored over the digital communications module.
The RS232C Module may also be used to form a hardwire

™

connection to a PC that is running the UltraLink

software utility.

Baud rates up to 19.2k are supported. Figure 1.10 illustrates typical
connections.

Figure 1.10

RS232 Connections

Rev. 5/07 -1.19- TFXD

PART 1 - INPUT/OUTPUT CONNECTIONS

RS485

The RS485 Module allows up to 128 TFX systems to be placed on a
single three-wire cable bus. All meters are assigned a unique one
byte serial number that allows all of the meters on the cable netwo rk
to be independently accessed. A proprietary digital communications
protocol is used for this communication. An explanation of the
command structure is detailed in the Appendix of this manual. Flow
rate, total, signal strength and temperature (if so equipped) can be
monitored over the digital communications bus. Baud rates up to
9600 and cable lengths to 5,000 feet [1,500 meters] are supported
without repeaters or “end of line” resistors. UltraLink™ is also
compatible with a multiple TFX network, allowing individual meters
to be accessed, programmed, diagnosed and calibrated.

To interconnect meters, utilize three-wire shielded cable such as
Belden 9939 or equal. In noisy environments the shield should be
connected on one end to a good earth ground connection. An
RS232 to RS485 scond, such as B&B electronics p/n 485SD9TB
(illustrated in Figure 1.11) is required to interconnect the RS485
network to a communication port on a PC. If more than 128 meters
must be monitored, an additional scond and communication port is
required.

Figure 1.11

RS485 Network

Connections

Rev. 5/07 -1.20- TFXD

PART 1 - INPUT/OUTPUT CONNECTIONS

Data Logger The 200,000 event data logger/electronic stripchart recorder can be

configured to match most user applications. The logger stores time­stamped, high resolution (16-bit) data at user selected intervals
ranging from 1 to 1,000 seconds. Configuration of and data retrieval
from the logger are detailed in Sections 3 and 4 of this manual.

The module can be carried in a shirt pocket back to the office and
plugged into a PC serial port via the module’s integral DB-9
connector. See Figure 1.12. This eliminates the requirement to
carry a computer to the flow meter site. The data in the logger can
also be accessed without removing the module from the flow meter.
Open the door of the flow meter and interconnect the 9-pin cable
between the data logger and the PC serial communications port.

Figure 1.12

Data Logger Connection

The logger is capable of storing up to 200,000 measurements. The
measurements are broken into 16 blocks or pages with a maximum
number of data points per block of 30,000.

If each block (page) is filled to the maximum 6-2/3 blocks would be
used:

200,000 Points

30,000 Points

= 6-2/3 Pages

If all 16 blocks are to be used, each block could hold 12,500 data
points:

200,000 Points

16 Pages

= 12,500 Points per page

NOTE: The logger will not automatically go to the next page if the
previous page is filled. In this case when the page exceeds 30,000
data points the oldest points will be discarded in favor of new points.
This is the classic FIFO memory stack.

Rev. 5/07 -1.21- TFXD

PART 1 - INPUT/OUTPUT CONNECTIONS

Up to 16 separate logging sessions are possible with up to 12,500
points each but for each new measurement session the logger must
be stopped, a new page selected using the data logger utility, and
then the logging must be started again. Similarly if a single point
data acquisition session were to exceed 30,000 points the logger
must be stopped, a new page selected using the data logger utility,
and then the logging must be started again.

NOTE: The data logger is not accessible using the TFXD’s infrared
adapter. Communications between the data logger and computer
must be accomplished using a directly connected RS232C or
RS485 connection.

NOTE: When a PC is connected to the data logger, it inhibits the
logger from collecting additional data.

Heat Flow

The RTD Module allows integration of two 1000 Ohm, platinum
RTDs with the TFXD flow meter, effectively providing an instrument
for measuring energy delivered in liquid cooling and heating
systems. The RTD Module is installed in the base of the TFX flow
transmitter. Each module is factory configured and encapsulated; it
cannot be altered. The configuration of the module will be indicated
by a factory mark in the box next to the module part number (see
Figure 1.13). If the module is not configured for the appropriate
temperature range for the installation, please contact the
Dynasonics factory to arrange for a replacement.

Module Temperature Range

D020-1045-106 -40 to +200 °C [-40 to +400 °F]
D020-1045-112 0 to +50 °C [+32 to +122 °F]

D020-1045-113 0 to +100 °C [+32 to +212 °F]

Figure 1.13

RTD Module Configuration

If RTDs were ordered with the TFXD flow meter they have been
factory calibrated and shipped connected to the module as they
were calibrated. If necessary, the green terminal block on the
module can be disconnected from the RTD module and the plug
routed out through the conduit hole in the bottom of the enclosure.
Simply turn the plug lengthwise and guide it through the hole. If the

Rev. 5/07 -1.22- TFXD

PART 1 - INPUT/OUTPUT CONNECTIONS

RTDs must be disconnected from the terminal block, it is
recommended that the RTDs and the wires be marked so that they
may be returned to their respective terminals – retaining the factory
calibration.

Dynasonics offers two types of RTDs:

SURFACE MOUNT RTDS
D010-3000-102 set of two, 130 °C Maximum Temperature
D010-3000-105 set of two, 200 °C Maximum Temperature

INSERTION RTDS
D010-3000-103 single, 3 inch [75 mm], 0.25 inch OD
D010-3000-104 single, 6 inch [150 mm], 0.25 inch OD

All RTDs are 1,000 Ohm platinum, three-wire connection and have
20 feet [6 meters] of shielded cable attached. Additional wire may be
attached so long as the wiring convention is retained. Figure 1.14
illustrates the connection of surface mount RTDs, D010-3000-105
and D010-3000-102. The wire color code on the insertion RTDs is
identical to the surface mount types. A schematic of the RTD
connections is illustrated in Figure 1.15.

Figure 1.14

RTD

Connections

Figure 1.15

RTD

Connection

Schematic

NOTE: Connect the shield to earth ground of the power connector

J2 (see Figure 1.15).

Rev. 5/07 -1.23- TFXD

PART 1 - STARTUP AND CONFIGURATION

Before
Starting the
Instrument

Instrument
Startup

Important!

NOTE: The TFX flow meter system requires a full pipe of liquid
before a successful startup can be completed. Do not attempt to

make adjustments or change configurations until a full pipe is
verified.

NOTE: If Dow 732 RTV was utilized to couple the transducers to
the pipe, the adhesive must fully cure before power is applied to the
instrument. Dow 732 requires 24 hours to cure satisfactorily. If Dow
111 silicone grease was utilized as a couplant, the curing time is not
required.

Procedure:

1. Verify that all wiring is properly connected and routed, as
described in Part 1 of this manual.

2. Verify that the transducers are properly mounted, as described in
Part 2 of this manual.

3. Apply power. The display of a TFXD2 will display a software
version number and then all of the segments will illuminate in
succession. (TFXD1 systems do not have a display or keypad,
so UltraLink

™

or an electronic I/O module must be monitored.)

The meter will then enter run mode.

In order to complete the installation of the TFX flow meter, the
pipe must be full of liquid.

To verify proper installation and flow measurement operation:

1. Go to the SER MENU. Confirm that signal strength (SIG STR) is
between 2.0% and 195%. If the signal strength is lower than

2.0%, verify that proper transducer mounting methods and liquid/
pipe characteristics have been entered. To increase signal
strength, if a W-Mount transducer installation has been selected,
reconfigure for a V-Mount installation; if V-Mount has been
selected, reconfigure for Z-Mount.

2. Verify that the actual measured liquid sound speed is very close
to the expected value (see page 2.11 for further details). The
measured liquid sound speed (SSPD FPS and MPS) is
displayed in the SERVICE Menu. Verify that the measured
sound speed is within 2% of the value entered as FLUID SS in
the BASIC Menu. The pipe must be full of liquid in order to
make this measurement.

3. Once the meter is properly operating, refer to Part 3 of this
manual for additional programming features.

Rev. 5/07 -1.24- TFXD

PART 2 - TRANSDUCER & RTD INSTALLATION

General

The transducers that are utilized by the TFXD contain piezoelectric
crystals for transmitting and receiving ultrasound signals through
walls of liquid piping systems. DTTN and DTTH transducers are
relatively simple and straightforward to install, but spacing and
alignment of the transducers is critical to the system's accuracy and
performance. Extra care should be taken to ensure that these
instructions are carefully executed. DTTS, small-pipe transducers,
have integrated transmitter and receiver elements that eliminate the
requirement for spacing measurement and alignment.

Mounting of the DTTN/DTTH clamp-on ultrasonic transit time
transducers is comprised of three steps:

1. Selection of the optimum location on a piping system.

2. Entering the pipe and liquid parameters into either the optional
software utility (UltraLink™) or keying the parameters into the
TFXD keypad. (TFXD systems that do not have an integral
keypad will require the use of UltraLink™ and a PC computer.)
The software embedded in UltraLink™ and the TFXD firmware
will calculate proper transducer spacing based on these entries.

3. Pipe preparation and transducer mounting.

TFXD transmitters with an RTD ISO-MOD module installed require
either one or two RTDs to measure heat flow (one RTD) or heat
usage (two RTDs). The Dynasonics flow meter utilizes 1,000 Ohm,
three-wire, platinum RTDs in two mounting styles. Surface mount
RTDs are available for use on well insulated pipe. If the area where
the RTD will be located is not insulated, inconsistent temperature
readings will result and insertion (wetted) RTDs should be utilized.
Instructions for the installation of the RTDs begin on page 2.17.

Rev. 5/07 - 2.1 - TFXD

PART 2 - TRANSDUCER & RTD INSTALLATION

1. Mounting Location

The first step in the installation process is the selection of an
optimum location for the flow measurement to be made. For this to
be done effectively, a basic knowledge of the piping system and its
plumbing is required.

An optimum location is defined as:

• A piping system that is completely full of liquid when

measurements are being taken. The pipe may become
completely empty during a process cycle - which will result in an
error code being displayed on the flow meter while the pipe is
empty. Error codes will clear automatically once the pipe refills
with liquid. It is not recommended to mount the transducers in
an area where the pipe may become partially filled. Partially
filled pipes will cause erroneous and unpredictable operation of
the meter.

• A piping system that contains lengths of straight pipe such

as those described in Table 2.1 on page 2.4. The optimum
straight pipe diameter recommendations apply to pipes in both
horizontal and vertical orientation. The straight runs in Table 2.1
apply to liquid velocities that are nominally 7 FPS [2.2 MPS]. As
liquid velocity increases above this nominal rate, the requirement
for straight pipe increases proportionally.

• Mount the transducers in an area where they will not be

inadvertently bumped or disturbed during normal operation.

• Avoid installations on downward flowing pipes unless

adequate downstream head pressure is present to overcome
cavitation in the pipe.

Rev. 5/07 - 2.2 - TFXD

PART 2 - TRANSDUCER & RTD INSTALLATION

2. Transducer Spacing

TFX transit time flow meters are sold with three different transducer
types: DTTN, DTTH and DTTS. Meters that utilize DTTN and DTTH
transducers consist of two separate sensors that function as both
ultrasonic transmitters and receivers. DTTS transducers integrate
both the transmitter and receiver into one assembly that fixes the
separation of the piezoelectric elements. DTTN and DTTH
transducers are clamped on the outside of a closed pipe at a
specific distance from each other. The transducers can be
mounted in V-Mount where the sound transverses the pipe twice,
W-Mount where the sound transverses the pipe four times, or in
Z-

Mount where the transducers are mounted on opposite sides of
the pipe and the sound crosses the pipe once. For further details,
reference pictures located under Table 2.2 on page 2.5. The
appropriate mounting configuration is based on pipe and liquid
characteristics. Selection of the proper transducer mounting method
is not entirely predictable and many times is an iterative process.
Table 2.2 contains recommended mounting configurations for
common applications. These recommended configurations may
need to be modified for specific applications if such things as
aeration, suspended solids or poor piping conditions are present.
W-Mount provides the longest sound path length between the
transducers - but the weakest signal strength. Z-Mount provides the
strongest signal strength - but has the shortest sound path length.
On pipes smaller than 3 inches [75 mm], it is desirable to have a
longer sound path length, so that the differential time can be
measured more accurately. Use of the TFX diagnostics in
determining the optimum transducer mounting is covered later in
this section.

Rev. 5/07 - 2.3 - TFXD

PART 2 - TRANSDUCER & RTD INSTALLATION

Table 2.1

Straight Pipe Requirements

Rev. 5/07 - 2.4 - TFXD