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TFX-500w
Operating Manual
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Dynasonics TFX-500w Operating Manual

Transit Time Ultrasonic Flow Meters
TFX-500w Clamp-On Meter
TTM-UM-02537-EN-04 (April 2019)
User Manual
Transit Time Ultrasonic Flow Meters, TFX-500w Clamp-On Meter
Page ii April 2019TTM-UM-02537-EN-04
User Manual
CONTENTS
Scope of This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Installing a Meter with a Remote Transmitter and Fixed Transducers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Installing a Meter with a Remote Transmitter and Adjustable Transducers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Installing a Meter with an Integral Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Wiring the Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Wiring the Transducer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Initial Meter Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Menu Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Parameter Descriptions by Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Main Menu Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Setup > Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Setup > Meter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Setup > Meter > Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Setup > Meter > Spacing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Setup > Meter > Flow Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Setup > Meter > Shunt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Page iii April 2019 TTM-UM-02537-EN-04
Transit Time Ultrasonic Flow Meters, TFX-500w Clamp-On Meter
Setup > Meter > Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Setup > Input/Output >Current Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Setup > Inputs/Output > Output #1 (or Output #2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Setup > Inputs/Output >Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Setup > Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Setup > Passcode Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Display Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Information Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Diagnostics Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Reset Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Out of Specication Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Check Function Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Warning and Alarm Message Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Symptoms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Front Panel Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Main Board Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Specications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Transducers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Conguration Software. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Part Number Construction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
North American Pipe Schedules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Page iv April 2019TTM-UM-02537-EN-04

Scope of This Manual

SCOPE OF THIS MANUAL
This manual is intended to help you get the TFX-500w meter up and running quickly. Read this manual carefully before attempting any installation or operation. Keep the manual accessible for future reference.

Typographic Conventions

• In step-by-step instructions, bold text indicates items on the screen you need to select or act upon. Example: Click the Setup menu.
• Names of parameters, options, boxes, columns and fields are italicized. Example: The value displays in the Status field.
• Messages and special markings are shown in quotation marks. Example: “Error” displays in the title bar.
• In most cases, software screen text appears in the manual as it does on the screen. For example, if a word is capitalized on the screen, it is capitalized when referred to in the manual.

UNPACKING AND INSPECTION

Upon opening the shipping container, visually inspect the product and applicable accessories for any physical damage such as scratches, loose or broken parts, or any other sign of damage that may have occurred during shipment.
OTE:N If damage is found, request an inspection by the carrier’s agent within 48 hours of delivery and file a claim with the
carrier. A claim for equipment damage in transit is the sole responsibility of the purchaser.

SAFETY

Mounting, electrical installation, start-up and maintenance of the instrument may only be carried out by trained personnel authorized by the operator of the facility. Personnel must read and understand this User Manual before carrying out its instructions.

Terminology and Symbols

WARNING

Considerations

• The installation of the TFX-500w meter must comply with all applicable federal, state, and local rules, regulations, and codes.
• Do not use sharp objects when operating the device (such as using a pen to press buttons on the keypad).
• When the TFX-500w meter is a part of a system, it is configured in a fail-safe operation so that if the transmitter signal is compromised, the TFX-500w meter will not cause harm to the system.
WARNING
THIS PRODUCT IS FOR USE ONLY WITH WATER, NOT FOR USE IN HAZARDOUS LOCATION APPLICATIONS.
AVERTISSMENT
CE PRODUIT NE DOIT ÊTRE UTILISÉ QU'AVEC DE L'EAU ET NE DOIT PAS ÊTRE UTILISÉ DANS DES ENDROITS DANGEREUX.
Indicates a hazardous situation, which, if not avoided, could result in severe personal injury or death.
Indicates a hazardous situation, which, if not avoided, is estimated to be capable of causing minor or moderate personal injury or damage to property.
MPORTANTI
Not following instructions properly may impair safety of equipment and/or personnel.
Page 5 April 2019 TTM-UM-02537-EN-04

Introduction

INTRODUCTION
The TFX-500w ultrasonic transit time flow meter measures volumetric flow of clean water in pipes 10 in. or smaller. By clamping on the outside of the pipe, the ultrasonic meter installs without cutting or tapping the pipe.
Transit time flow meters use two transducers that clamp on to the outside of a pipe and never directly contact the fluids. The transducers function as both ultrasonic transmitters and receivers. The flow meters operate 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. 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). The sound’s time is accurately measured in both directions.
Figure 1: Meter operation

DIMENSIONS

Enclosure, Integral and Remote, Front View Integral Enclosure Side View Remote Enclosure Side View
6.00 in.
(152.40 mm)
2.68 in. (68.07)
0.31 in.
(7.87 mm)
2.68 in. (68.07)
0.38 in.
(9.65 mm)
5.55 in.
(140.97 mm)
0.65 in.
(16.51 mm)
Figure 2: Dimensions
Page 6 April 2019TTM-UM-02537-EN-04

OPERATION

Keypad Operation on the Home Screen

The MENU/BACK key enters menu structure.
The DOWN ARROW key toggles between flow rate, flow total, velocity and flow rate with flow total.
The RIGHT ARROW key has no function.
The ENTER key has no function.
Operation

Keypad Operation in the Menu Structure

The cursor bar highlights the submenu or parameter that will be viewed or edited. The scroll bar on the right indicates the relative position the cursor bar is at on the list when there are more than 4 items.
• MENU/BACK returns to parent menu (up a level). If at the Main (top level) menu, returns to the Home Screen.
• DOWN ARROW scrolls the list.
• RIGHT ARROW and ENTER have the same function in the menu structure and advance to the submenu or to
read/edit a parameter.
Page 7 April 2019 TTM-UM-02537-EN-04
Operation

Selecting an Option in a Parameter Selection List

The active option in the parameter list has a filled-in box on the left side. The scroll bar on the right indicates the relative position the cursor bar is at on the list when there are more than 4 items.
• DOWN ARROW scrolls the list.
• RIGHT ARROW and ENTER have the same function in the parameter selection list. Pressing either of these buttons selects
the option and the box on the left side fills in to show the item is selected.
• MENU/BACK exits parameter editing and returns to the parent menu (up a level).

Entering a Number

The parameter name and current value is displayed in the top portion of the screen. Edit the number on the bottom right of the screen.
• MENU/BACK exits parameter editing and returns to parent menu (up a level). The parameter remains at the value displayed in the top portion of the screen.
• DOWN ARROW cycles through the numbers and other options.
• RIGHT ARROW moves the cursor to the right. Once it reaches the rightmost digit or a space, the cursor moves to the
leftmost digit.
• ENTER accepts the value.
Page 8 April 2019TTM-UM-02537-EN-04

INSTALLATION

Overview

Each of the installation steps that follow is explained in detail on page 10 through page 12 . The actual installation procedures differ slightly, depending on whether the transducers are fixed or adjustable.
If the transducers are fixed, you will:
1. Install the transducers.
2. Install the transmitter.
3. Wire the transmitter.
4. Program the meter. If the transducers are adjustable, you will:
1. Install the transmitter.
2. Wire the transmitter.
3. Set up the meter (select the optimum transmission mode, enter the site information, and enter the uid and pipe properties).
4. Install the transducers.
5. Complete the meter programming.
Installation

Installation Considerations

Mount the transmitter in a location:
• Where little vibration exists.
• That is protected from corrosive fluids.
• That is within the transmitters ambient temperature limits: With display, –4…140° F (–20…60° C); without display: –40…158° F (–40…70° C).
• That is out of direct sunlight. Direct sunlight may increase transmitter temperature to above the maximum limit.

Equipment Required

• Screwdrivers, wide blade and tiny blade (for securing wires to the terminal blocks)
• User manual for the transducers
• Four #8 or M4 screws, if mounting the transmitter on a wall
• Stainless steel banding straps, if mounting the transmitter on a pipe

Installing the Transducers

See the user manual for your particular transducer for installation instructions.
Page 9 April 2019 TTM-UM-02537-EN-04
Installation

Installing a Meter with a Remote Transmitter and Fixed Transducers

• Locate the transmitter within the length of the transducer cables supplied or exchange the cable for one of proper length.
• See Figure 2 on page 6 for enclosure and mounting dimension details. Allow enough room for door swing, maintenance and conduit entrances.
MPORTANTI
When routing wires to the transmitter, make sure the cables are not twisted, pinched or hanging loosely.
1. Install the xed transducers according to instructions in the transducer user manual.
2. Partially loosen the 2 enclosure captive screws on the left side of the transmitter cover. Completely loosen the 2 screws on the right side. Grasp and lift the cover and open it to the left. The cover remains attached and the left screws act as a hinge.
Unscrew
Captive Screws
Figure 3: Captive cover screws Figure 4: Lift cover from base Figure 5: Open cover to the left
3. Unscrew the wingnut from the threaded stud on the inside back of the enclosure to release the adapter plate. Set aside the wingnut.
Figure 6: Rotatable adapter plate
4. If necessary, rotate the adapter plate by 90° to accommodate the nal orientation of the transmitter.
5. Mount the adapter plate either to a wall (with 4 customer-supplied #8 or M4 screws) or to a pipe (with mounting straps).
Holes for
Screws
Figure 7: Wall mount Figure 8: Pipe Mount
Holes for
Screws
Holes for Straps
6. Use conduit holes where cables enter the enclosure from the bottom. Use plugs to seal any holes that are not used for cable entry. A cable gland kit is included for inserting the transducer and power cables.
OTE:N Use NEMA 4 (IP-66) rated fittings/plugs to maintain the watertight integrity of the enclosure. Generally, the right
conduit hole (viewed from front) is used for power, the left conduit hole for transducer connections, and the center hole is used for I/O wiring.
7. Install the wires through the gland nuts and connect the wires to the removable terminal blocks. See “Wiring the
Transmitter” on page13.
8. Wire the transducers to the transmitter.
9. Slide the meter enclosure over the threaded stud and secure it with the wingnut.
10. Plug the wired terminal blocks into the main board.
11. Reassemble the cover.
12. Set up the meter. See “Initial Meter Setup” on page16 for instructions.
Page 10 April 2019TTM-UM-02537-EN-04
Installation

Installing a Meter with a Remote Transmitter and Adjustable Transducers

• Locate the transmitter within the length of the transducer cables supplied or exchange the cable for one of proper length.
• See Figure 2 on page 6 for enclosure and mounting dimension details. Allow enough room for door swing, maintenance and conduit entrances.
MPORTANTI
When routing wires to the transmitter, make sure the cables are not twisted, pinched or hanging loosely.
1. Partially loosen the 2 enclosure captive screws on the left side of the transmitter cover. Completely loosen the 2 screws on the right side. Grasp and lift the cover and open it to the left. The cover remains attached and the left screws act as a hinge.
Unscrew
Captive Screws
Figure 9: Captive cover screws Figure 10: Lift cover from base Figure 11: Open cover to the left
2. Unscrew the wingnut from the threaded stud on the inside back of the enclosure to release the adapter plate. Set aside the wingnut.
Figure 12: Rotatable adapter plate
3. If necessary, rotate the adapter plate by 90° to accommodate the nal orientation of the transmitter.
4. Mount the adapter plate either to a wall (with 4 customer-supplied #8 or M4 screws) or to a pipe (with mounting straps).
Holes for
Screws
Figure 13: Wall mount Figure 14: Pipe Mount
Holes for
Screws
Holes for Straps
5. Use conduit holes where cables enter the enclosure from the bottom. Use plugs to seal any holes that are not used for cable entry. A cable gland kit is included for inserting the transducer and power cables.
OTE:N Use NEMA 4 (IP-66) rated fittings/plugs to maintain the watertight integrity of the enclosure. Generally, the right
conduit hole (viewed from front) is used for power, the left conduit hole for transducer connections, and the center hole is used for I/O wiring.
6. Install the wires through the gland nuts and connect the wires to the removable terminal blocks. See “Wiring the
Transmitter” on page13.
7. Set up the meter. See “Initial Meter Setup” on page16 for instructions.
8. Install the adjustable transducers according to instructions in the transducer user manual.
9. Wire the transducers to the transmitter.
10. Slide the meter enclosure over the threaded stud and secure it with the wingnut.
11. Plug the wired terminal blocks into the main board.
12. Reassemble the cover.
Page 11 April 2019 TTM-UM-02537-EN-04
Wiring the Transmitter

Installing a Meter with an Integral Transmitter

1. Install the meter on the pipe according to the instructions in the user manual for your particular transducer.
Pipe
Figure 15: Install the meter onto the pipe
2. Partially loosen the 2 enclosure captive screws on the left side of the transmitter cover. Completely loosen the 2 screws on the right side. Grasp and lift the cover and open it to the left. The cover remains attached and the left screws act as a hinge.
3. If necessary, rotate the transmitter 180° by opening the cover, loosening the wing nut, repositioning the transmitter, and reinstalling all of the connections.
4. Use conduit holes where cables enter the enclosure from the bottom. Use plugs to seal any holes that are not used for cable entry. A cable gland kit is included for inserting the transducer and power cables.
OTE:N Use NEMA 4 (IP-66) rated fittings/plugs to maintain the watertight integrity of the enclosure. Generally, the right
conduit hole (viewed from front) is used for power, the left conduit hole for transducer connections, and the center hole is used for I/O wiring.
5. Install the wires through the gland nuts and connect the wires to the removable terminal blocks. See “Wiring the
Transmitter” on page13.
6. Plug the wired terminal blocks into the main board.
7. Reassemble the cover.
Page 12 April 2019TTM-UM-02537-EN-04

Wiring the Transmitter

WIRING THE TRANSMITTER
IMPORTANT: Select field wiring means rated for 5° C above the maximum area temperature when it is possible that the
temperature will exceed 55° C. To access terminal strips for wiring, loosen the 4 enclosure captive screws. Grasp and lift the cover and open it to the left. The
cover remains attached and the left screws act as a hinge.
Electrical Symbols
Function Direct Current Alternating Current Earth (Ground) Protective Ground Chassis Ground
Symbol
Figure 16: Electrical symbols
TB400 Power
Connector
9 - 28V DC
@ 5W (Max)
TB500
Digital I/O
Connector
TOTAL RESET
ENC DOUT
ENC CLK IN
TB300 Transducer Connector
UP
STREAM
DOWN
STREAM
24V OUT
Connector
4-20 OUT
4-20 LOOP
TB600
Output
RS-485
1 2
CONTROL
OUT
Figure 17: Wiring connectors

Wiring the Transducer

1. Guide the transducer terminations through the transmitter conduit hole in the bottom-left of the enclosure.
2. Secure the transducer cable with the supplied conduit nut (if exible conduit was ordered with the transducer).
3. The terminals within the transmitter are screw-down barrier terminals. Connect the wires at the corresponding screw terminals in the transmitter. Observe upstream and downstream orientation and wire polarity. See Figure 18.
TB300 External Equipment
1
2
3
4 5
6
Figure 18: Upstream/downstream transducer
UP/TX Red
UP/TX Black
DN/TX Red
DN/TX Black
Page 13 April 2019 TTM-UM-02537-EN-04
Wiring the Transmitter
OTE:N Transducer cables have two wire-color combinations. For the blue and white combination, the blue wire is positive
(+) and the white wire is negative (–). For the red and black combination, the red wire is positive (+) and the black wire is negative (–). The transducer wires are labeled to indicate which pair is upstream or downstream.
4. Connect power to the screw terminal block in the transmitter using the conduit hole in the center of the enclosure. Use wiring practices that conform to local and national codes such as The National Electrical Code Handbook in the U.S.
ANY OTHER WIRING METHOD MAY BE UNSAFE OR CAUSE IMPROPER OPERATION OF THE TRANSMITTER.
OTE:N This transmitter requires clean electrical line power. Do not operate this transmitter on circuits with noisy
components (such as fluorescent lights, relays, compressors, or variable frequency drives). Do not use step-down transformers from high voltage, high amperage sources. Do not to run signal wires with line power within the same wiring tray or conduit.
DC Power Connections
The transmitter may be operated from a 9…28V DC source, as long as the source supplies a maximum of 5 Watts of power. Connect the DC power to 9…28V DC In, power ground, and chassis ground, as in Figure 19.
OTE:N DC-powered transmitters are protected from major catastrophe with an internal 1.5 Amp SLO-BLO fuse. If this fuse is
blown, the transmitter must be inspected and the fuse replaced at the factory.
IMPORTANT: A Class II DC power supply is required.
9…28V DC
Switch
or
Circuit
Breaker
Power
Common
Chassis Ground
Power
Figure 19: DC power connections
TB400 External Equipment
1
2
3
Power Supply (9 . . . 28V DC)
Power Supply (0V)
Chassis Ground
4…20 mA Output Wiring
The 4…20 mA output transmits an analog current signal that is proportional to system flow rate. The 4…20 mA output can be internally or externally powered and can span negative to positive flow rates.
DC-powered transmitters use the DC power supply voltage to drive the current loop. The current loop is not isolated from DC ground or power.
TB600
24V DC
(42 mA) max.
Figure 20: Typical 4 . . . 20 mA interface using internal isolated 24V DC source Figure 21: Typical 4 . . . 20 mA interface using external isolated 24V DC source
1
2
3
4
External Equipment
Current Output
800 Ohms max.
TB600
1
2
3
4
No Connect
Current Output
External Equipment
24V DC (30V DC max.)
800 Ohms max.
Page 14 April 2019TTM-UM-02537-EN-04
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