Onicon FT-3400 Operating instructions

ON I CON
Flow and Energy Measurement
FT-3400FT-3400
ELECTROMAGNETIC FLOW METERELECTROMAGNETIC FLOW METER
Installation and Operation GuideInstallation and Operation Guide
DOC-0005859 Rev.A

FT-3400 ELECTROMAGNETIC FLOW METER
727.447.6140 Page 2 onicon.com
SAFETY INFORMATION
This meter was calibrated at the factory before shipment. To ensure correct use of the meter, please read this manual
thoroughly.
Regarding this Manual:
• This manual should be passed on to the end user.
• Before use, read this manual thoroughly to comprehend its contents.
• The contents of this manual may be changed without prior notice.
• All rights reserved. No part of this manual may be reproduced in any form without
ONICON’s written permission.
• ONICON makes no warranty of any kind with regard to this material, including, but not limited to, implied warranties
of merchantability and suitability for a particular purpose.
• All reasonable eort has been made to ensure the accuracy of the contents of this manual. However, if any errors
are found, please inform ONICON.
• ONICON assumes no responsibilities for this product except as stated in the warranty.
• If the customer or any third party is harmed by the use of this product, ONICON assumes no responsibility for any
such harm owing to any defects in the product which were not predictable, or for any indirect damages.
SAFETY PRECAUTIONS:
The following general safety precautions must be observed during all phases of installation, operation, service, and repair
of this product. Failure to comply with these precautions or with specic WARNINGS given elsewhere in this manual
violates safety standards of design, manufacture, and intended use of the product. ONICON Incorporated assumes no
liability for the customer’s failure to comply with these requirements. If this product is used in a manner not specied in
this manual, the protection provided by this product may be impaired.
The following messages are used in this manual:
WARNING
Messages identied as “WARNING” contain information regarding the personal safety of individuals involved in
the installation, operation or service of this product.
CAUTION
Messages identied as “CAUTION” contain information regarding potential damage to the product or other
ancillary products.
IMPORTANT NOTE
Messages identied as “IMPORTANT NOTE” contain information critical to the proper operation of the product.

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TABLE OF CONTENTS
SECTION 1.0 INTRODUCTION ..............................................................................................................................4
1.1 PURPOSE OF THIS GUIDE...............................................................................................................................................4
1.2 TYPICAL INSERTION ELECTROMAGNETIC FLOW METER...................................................................................4
1.3 STANDARD FEATURES AND SPECIFICATIONS........................................................................................................5
1.4 ADDITIONAL REQUIRED HARDWARE INSERTION KIT ........................................................................................5
1.5 ADDITIONAL HARDWARE THAT MAY BE REQUIRED...........................................................................................6
1.5.1 Grounding Rings....................................................................................................................................................6
1.5.2 Grounding Probes .................................................................................................................................................7
SECTION 2.0 UNPACKING .....................................................................................................................................7
2.1 CHECKING THAT YOU HAVE RECEIVED EVERYTHING.........................................................................................7
SECTION 3.0 INSTALLATION, REMOVAL & ADJUSTMENT ................................................................................8
3.1 INSTALLATION SITE SELECTION...................................................................................................................................8
3.2 MECHANICAL INSTALLATION....................................................................................................................................10
3.2.1 Installation Kit ......................................................................................................................................................11
3.2.2 ONICON Standard Installation Hardware Kit........................................................................................... 11
3.2.3 ONICON Hot Tap Installation Hardware Kit ............................................................................................. 11
3.2.4 Customer Supplied Installation Hardware................................................................................................ 12
3.2.5 Conrming the Stack Height..........................................................................................................................13
3.2.6 Installing Grounding Rings and Grounding Probes .............................................................................. 14
3.2.7 Installing the Flow Meter................................................................................................................................. 16
3.3 INSERTION OF THE METER .........................................................................................................................................17
3.3.1 Inserting Standard Conguration Flow Meters........................................................................................ 17
3.4 REMOVAL OF THE METER ...........................................................................................................................................18
3.5 WIRING CONNECTIONS...............................................................................................................................................19
3.5.1 Signal and Power Wiring Connections....................................................................................................... 19
3.5.2 Earth Connection ................................................................................................................................................ 23
SECTION 4.0 START-UP & COMMISSIONING ...................................................................................................24
4.1 HELPFUL HINTS FOR START-UP AND COMMISSIONING ............................................................................... 24
4.2 START-UP AND COMMISSIONING .......................................................................................................................... 25
4.3 START-UP AND COMMISSIONING WORKSHEET............................................................................................... 26
4.4 TROUBLESHOOTING GUIDE ....................................................................................................................................... 27
4.4.1 Earth Connections & Electrical Noise Reduction.................................................................................... 27
4.5 WARNINGS, ALARMS & ERRORS .............................................................................................................................29

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Typical Meter Installation
(New Construction or Scheduled Shutdown)
This guide is the basic reference tool for all ONICON FT-3400 Electromagnetic Flow Meters. If you have not purchased all
of the options, there will be references in this manual which are not applicable to your meter(s).
1.2 TYPICAL INSERTION ELECTROMAGNETIC FLOW METER
Faraday’s Law of electromagnetic induction states that a voltage will be induced in a conductor when it passes through a
magnetic eld, and the induced voltage will be directly proportional to the velocity of the conductor.
ONICON FT-3400 Electromagnetic Flow Meters generate pulsating magnetic elds that are used to induce a voltage into
the conductive uid owing through the pipe. Electrodes located on the ow meter sensor head measure the induced
voltage. Circuitry within the ow meter electronics enclosure then converts the voltage to digital and analog signals that
convey ow rate and total data via connecting the cable to any of ONICON’s display devices, Btu meters and/or to a data
acquisition system.
SECTION 1.0: INTRODUCTION
We, at ONICON Incorporated, would like to thank you for purchasing our quality American made
FT-3400 Electromagnetic Flow Meter. As our valued customer, our commitment to you is to provide fast reliable service,
while continuing to oer you quality products to meet your growing ow measurement needs.
1.1 PURPOSE OF THIS GUIDE
We have written this guide to provide the persons responsible for the installation, operation and maintenance of your ow
meter with the most specic equipment information they will need. This is NOT an electrical or plumbing trade manual.
WARNING
Please do not permit persons to install, operate or maintain this equipment unless they have a complete knowledge
of their trade skills and are competent to work on high pressure hot and cold water and steam systems, according
to their individual trades. Death or permanent injury may result from accidents with these systems.
½" FNPT
conduit connection
Insertion depth
gauge provided
with each meter
FLOW
Connect factory
wires to field wires
in appropriate
junction box.
Output signal(s)
to control
system
ONICON
Display or
BTU Meter
(Optional)
Allow enough slack
in the flexible conduit
to permit the meter
to be removed
from the valve.
Typically
30" - 36"
depending on
pipe size and
height of valve
assembly.
CLEARANCE
REQUIRED
FOR INSTALLATION
Standard Installation
Kit for Steel Pipe
1" Full port ball valve
1" Close nipple
1" Branch outlet
1¼" for
hot tap
Minimum Hole Size = 1"
Must be centered
Note: Installation kits vary based on pipe material and application. For installations in pressurized (live)
systems, use "Hot tap" 1¼ inch installation kit and drill hole using a 1 inch wet tap drill.
• Install in vertical or horizontal pipe
• For horizontal pipe position meter
anywhere in upper 240˚
NOTE: Grounding rings placed before
and after the meter are required for
installation on non-metallic or lined
pipes.

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1.3 STANDARD FEATURES AND SPECIFICATIONS
1.4 ADDITIONAL REQUIRED HARDWARE INSERTION KIT
All ONICON insertion type meters can be installed and removed via
a 1” or larger full port ball valve without system shutdown. The terms
“Standard” and “Hot Tap” refer to the installation method of the isolation valve kit only.
Standard Installation Hardware: For new construction or scheduled shutdown; once kit is
installed, the ow meter can be installed or removed without system shutdown.
Hot Tap Installation Hardware: For applications which require the access hole in the pipe
to be drilled through the valve using a wet tap drilling machine while the hydronic system
is pressurized and operating.
NOTE: Installation hardware materials vary greatly based on pipe material, pipe size and
standard vs. hot tap versions.
*Specications subject to change without notice.
MODEL FT-3400
PERFORMANCE ACCURACY ±1.0% of reading from 2 - 20 ft/s
±0.02 ft/s below 2 ft/s
MINIMUM CONDUCTIVITY 25 μS/cm
INPUT POWER 20 - 28 VDC, 400 mA at 24 VDC
20 - 28 VAC, 60 Hz, 10 VA
I/O SIGNAL ANALOG OUTPUT (ISOLATED) One (1) 4-20 mA analog output, and one (1) 0-10 V or 0-5 V
analog output
FREQUENCY OUTPUT 0-15 V peak pulse, 0-500 Hz
SCALABLE PULSE OUTPUT Isolated solid state dry contact
Contact rating: 30 V, 1.2A
Pulse Duration: 0.5, 1, 2 or 6 seconds
ELECTRONICS ENCLOSURE Weathertight NEMA 4 aluminum enclosure
ELECTRICAL CONNECTIONS 10’ or 20’ of PVC jacketed cable with ½” NPT conduit connection
FLOW RANGE 0.1 ft/s to 20 ft/s (200:1 turndown)
SENSING METHOD Electromagnetic sensing (no moving parts)
PIPE SIZE RANGE AVAILABLE OPTIONS Standard Conguration: 3 - 72” nominal diameter
LIQUID TEMPERATURE RANGE 15°F to 250°F
AMBIENT TEMPERATURE
RANGE
-20°F to 150°F
OPERATING PRESSURE 400 psi maximum
PRESSURE DROP 0.1 psi at 12 ft/s in 3” pipe, decreasing as line size increases
MATERIAL Wetted metal components: 316 Stainless Steel
Sensor head: XAREC
Optional: NSF/ANSI 61/372 version

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1.5 ADDITIONAL HARDWARE THAT MAY BE REQUIRED
1.5.1 Grounding Rings
Grounding rings may be required whenever meters are installed in non-metallic or lined pipes. Grounding rings placed
before and after the meter eliminate electrical noise that will interfere with the proper operation of the meter. ONICON
provides grounding rings as an optional accessory. Grounding ring dimensional information and part numbers are listed
below. For proper operation, grounding rings are required before and after the meter.
GROUNDING RING
ORDERING INFORMATION
ANSI Class 150
316 Stainless Steel
Grounding Rings (pair)
Nominal
Size
ONICON Part
Number
1.5” 19266
2” 19267
3” 19268
4” 19269
6” 19270
8” 19271
10” 19272
12” 19273
14” 19274
16” 19275
18” 19276
20” 19277
24” 19278
30” 19279
36” 19280
42” 19281
Grounding Ring Dimensions
Nominal Size Bore A C D
1.5” 1 – 9/16 3 – 3/8 5 - 5/16 1 - 15/16
2” 2 – 1/16 4 – 1/8 6 - 1/16 1 - 15/16
3” 3 – 1/16 5 – 3/8 7 - 5/16 1 - 15/16
4” 4 – 1/16 6 – 7/8 8 - 13/16 1 - 15/16
6” 6 8 – 3/4 10 - 11/16 1 - 15/16
8” 8 11 12 - 15/16 1 - 15/16
10” 9 – 1/2 13 – 3/8 15 - 5/8 2 - 1/4
12” 11 – 9/16 16 – 1/8 18 - 9/16 2 - 7/16
14” 13 – 1/2 17 – 3/4 20 - 3/8 2 - 5/8
16” 15 – 1/4 20 – 1/4 22 - 7/8 2 - 5/8
18” 17 – 3/8 21 – 5/8 24 - 1/4 2 - 5/8
20” 19 23 - 7/8 26 - 11/16 2 - 13/16
24” 23 28 – 1/4 31 - 1/8 2 - 7/8
30” 29 34 – 3/4 38 3 - 1/2
36” 35 41 – 1/4 45 - 1/4 4
42” 41 48 52 - 1/2 4 - 1/2
D
C
3/8
5/8
Bore
A
1/4
1/8”
Typical Installation
Non-conductive Pipe
GROUNDING RING
DIMENSIONS
Note: Refer to page 21 for best
earth-ground connection
Grounding Rings

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SECTION 2.0: UNPACKING
ONICON insertion electromagnetic ow meters are packed and shipped in individual cartons. All other installation
hardware and peripheral devices, including Btu meters and display modules, will be packaged and shipped separately.
Conrm meter is designed for the specic application. The FT-3400 has three types of sensors (hot water, chilled
water, and domestic water). The conguration sheet has the type of application as well as any peripheral information
attached to the meter.
Please open all packages with care to prevent damage to their contents. Carefully inspect each item for signs of
damage in transit. The ow meter stem should be straight and free of blemishes or abrasions. The sensor head should
have a smooth continuous surface that is free of abrasions.
All ONICON products are shipped insured unless the customer specically requests otherwise. Please notify the
shipping company and ONICON immediately if any items are damaged in transit. Save all packing material for
inspection by the shipper.
2.1 CHECKING THAT YOU HAVE RECEIVED EVERYTHING
Your FT-3400 shipment should arrive with the following items:
• FT-3400 Insertion Electromagnetic Flow Meter
• Adjustable Insertion Depth Gauge
• Optional Installation Hardware Kit, if ordered
Enclosed with each meter is a comprehensive documentation package that includes the following items:
• Quick Start Guide with Meter Conguration (hanging tag)
• Flow Meter Certicate of Calibration
• Flow Meter Conguration Sheet
Please notify the ONICON if any of these documents are missing.
Grounding probes may be required whenever meters are installed in pressurized systems with non-metallic or lined pipes.
Grounding probes can be hot-taped to avoid draining the system. A grounding probe is required before and after the
meter to ground any electrical noise coming from any direction.
1.5.2 Grounding Probes

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SECTION 3.0: INSTALLATION, REMOVAL AND ADJUSTMENT
WARNING
Insertion ow meters may be installed in pipes which are under high pressure. Accidents with these systems can
cause serious injury or death. Only persons experienced with high pressure systems and related knowledge in the
heating, cooling and uid metering elds should attempt to install, adjust, or remove the ow meter. Please read
all instructions before attempting to insert or remove a ow meter.
ONICON will be happy to assist with technical recommendations and to provide guidance by telephone or e-mail. On-site
eld engineering, installation and service is also available at additional cost.
3.1 INSTALLATION SITE SELECTION
Install the ow meter where it will be accessible for personnel to perform necessary periodic maintenance. The clearance
required for installation is typically 30-40” from the pipe wall to the nearest obstruction above the valve assembly. This
clearance dimension will increase with large diameter pipes. The environment should be free of corrosive liquids/fumes,
temperature extremes and heavy vibration. The diagrams on the following page should be used as a guide to the proper
location for installing the meter.
GENERAL PRACTICES:
1. For best results, install the ow meter in a straight run of pipe, free of bends, tees, valves, transitions, and
obstructions.
2. Straight run requirements vary based on the nature of the upstream obstruction. See the table on the following
page for guidelines in determining minimum up stream straight run requirements based on the nature of the
obstruction.
Note: Depending upon specic location details, more or less straight run may be required to produce a
satisfactory ow prole.
3. If there is insucient straight run, allow 80% of the run upstream and 20% of the run downstream. If the total
length of straight run is less than 70% of the recommended length, performance may seriously degrade, and
consideration should be given to changing to the series FT-3000 Inline Electromagnetic Flow Meter. The FT-
3400 can be installed in the supply or return line on close loop systems.
How To Determine The Available Straight Pipe Diameters:
For each application, locate the longest straight, unobstructed section of pipe (no bends, tees, valves, other
insertion probes, size transitions). The longest straight pipe run in inches divided by nominal pipe size in inches
equals “diameters of straight pipe.” For closed loop applications, consider both the supply and return lines as
possible locations.
IMPORTANT NOTE
Always use the maximum available straight run. When more than the minimum required straight run is available,
place the meter such that the excess straight run is upstream of the meter location.

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Upstream obstruction (A) Minimum straight run required
upstream of meter location
Single bend preceded by ≥ 9 diameters of straight pipe 10 Diameters
Pipe size reduction / expansion in straight pipe run 10 Diameters
Single bend preceded by ≤ 9 diameters of straight pipe 15 Diameters
Outowing tee / Pump outow 20 Diameters
Multiple bends out of plane 30 Diameters
Inowing tee 30 Diameters
Control / Modulating valve 30 Diameters
For 3” and larger pipe diameters
Installation with Grounding Rings with
Non-conductive Pipe
* Additional straight run may be required upstream of the upstream grounding ring based on the nature of
the upstream obstruction. Refer to the chart above to determine how much straight run is required.
*
FLOW
5D A
Upstream
Downstream
Available Straight Run
FT-3400 Series
30 - 40"
depending on
pipe size
CLEARANCE
REQUIRED FOR
INSTALLATION
FLOW
5D A
Upstream
Downstream
Available Straight Run
Vertical
Pipe
Position
For Horizontal Pipe
Position Meter
Anywhere in Upper
240º (All Meters)
Note: Refer to page 21 for best
earth-ground connection

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3.2 MECHANICAL INSTALLATION
ONICON Insertion Electromagnetic Flow Meters employ a hot tap adapter design that allows for insertion and
removal, when necessary, without interrupting ow and draining the pipe. To take advantage of this feature, the
ow meter must be installed through an isolation valve. The installation must allow for sucient overhead clearance
to fully extract the meter, and a full 1” opening in the pipe wall is required to clear the sensor head and allow for
insertion. Make sure that your valves and ttings are full port and at least 1” in actual internal diameter for dry tap
installation or at leat 1.25” for hot tap installations..
Typically
30 - 40"
depending on
pipe size and
height of valve
assembly.
CLEARANCE
REQUIRED
FOR INSTALLATION
Minimum Hole Size = 1"
Must be centered
Dry Tap Installation
Kit for Steel Pipe
1" Full port ball valve
1" Close nipple
1" Branch outlet
1¼" for
hot tap
NOTE: Use stainless steel or brass
close nipple only.
CAUTION
ONICON insertion style ow meters must be installed through a valve assembly. Failure to do so negates the ability
to remove the meter without shutting down and draining the system. It will also result in an excessive amount of
stem protruding from the pipe. Excessive stem lengths unnecessarily expose the meter to incidental damage.
IMPORTANT NOTE
Flow meters installed through oversized access holes will be subjected to undesirable turbulence that may aect
the accuracy of the meter.

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3.2.2 ONICON Standard Installation Hardware Kit
Standard installation hardware kits are designed to be installed on piping systems that are drained and at atmospheric
pressure. The access hole is drilled (1” minimum) prior to installation of the branch outlet with 1” NPT threads, close nipple
and full port ball valve. Once the isolation valve is installed, the piping system can be ushed, lled and pressurized. The
ow meter may now be inserted or removed by hand without having to drain the system. Please read all instructions
before proceeding with meter insertion.
3.2.3 ONICON Hot Tap Installation Hardware Kit
ONICON oers an alternative installation hardware kit when it is not practical to relieve pressure and drain the system. In
this case, a 1¼” branch outlet, close nipple and 1¼” full port ball valve are installed rst. Then, a hot tap drilling apparatus
is used to drill a 1” diameter hole through the valve. This eliminates the need to shut down and drain the pipe. Please read
all instructions before proceeding with meter insertion.
3.2.1 Installation Kit
ONICON oers a wide range of installation hardware kits for commonly used pipe materials. The kits are specically
designed for ONICON ow meters, and their use is recommended.
The use of ONICON installation hardware kits accomplishes two important objectives. First, it ensures that the proper
hardware is used. Second, it simplies order processing by standardizing the dimensions of the installation hardware.
ONICON must have an accurate measurement of the overall height of the installation hardware as measured from the
outside wall of the pipe to the top of the valve in order to determine the correct stem length when assembling the meter
in our factory. ONICON documents refer to this dimension as the stack height.
ONICON installation hardware kits consist of three separate component parts:
Dierent pipe materials require dierent branch outlets and may include additional bushings, like those shown below, to
properly size the opening.
A threaded branch
outlet
A threaded close
nipple
A full port
isolation valve

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3.2.4 Customer Supplied Installation Hardware
There are occasions where circumstances require that the customer provide the installation hardware or that the
ow meter must be installed through existing hardware. In these cases, it is important to conrm that the installation
hardware is suitable for use with the ow meter provided by ONICON before it is installed. The installation must allow
for sucient overhead clearance to fully extract the meter and a full 1” opening in the pipe wall is required to clear
the sensor head and allow for insertion. Make sure that your valves and ttings are full port and at least 1” in actual
internal diameter.
Installation hardware generally consists of three separate component parts:
CAUTION
Do not use threaded steel or slip PVC tees to provide the 1” opening in the pipe. Tees of this type will cause
signicant errors in the ow measurement.
CAUTION
In order to provide the ow meter with the correct stem length, ONICON must know the overall height of the
installation hardware as measured from the outside wall of the pipe to the top of the valve where the meter is
installed.
CAUTION
Use stainless steel or brass nipple only.
A threaded branch
outlet
A threaded close
nipple
A full port
isolation valve

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3.2.5 Conrming the Stack Height
ONICON insertion ow meter stem lengths vary according to the pipe diameter and the height of the installation
hardware stack. ONICON records the stack height dimension provided by the customer at the time of order entry, and the
information is used to size the stem. For standard conguration meters, the dimension of the stack height and the depth
gauge is shown on the tag attached to the meter.
Small Pipe Conguration meters use an insertion depth collar to properly set the insertion depth.
Prior to installing the meter, conrm that the stack height recorded on the tag is close to the actual stack height. Flow
meter stems are intentionally over sized to allow for variations of at least 2” in the stack height. Contact ONICON prior to
installation if there is any question regarding stack height or stem length. This way ONICON can oer you credit for your
meter if you decide to exchange the meter for one with a dierent stem length. Returns may be subject to a restocking fee.
Insulation
Pipe
Stack
Height

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3.2.6 Installing Grounding Rings and Grounding Probes
* Additional straight run may be required upstream of the upstream grounding ring based on the nature of the
upstream obstruction. Refer to the chart in Section 3.1 on page 8 of this manual to determine how much straight
run is required.
Grounding rings are used to suppress electrical interference at the installation location for electromagnetic ow meters. They
are provided in pairs and are installed upstream and downstream of the ow meter. The use of grounding rings signicantly
reduces electrical noise and may be necessary for proper operation of ow meters installed in lined or non-conductive pipes.
Grounding Ring Installation Instructions
1. Install the rings upstream and downstream of the meter as shown above.
(Please note that the straight run requirements shown above are only for locating the grounding rings with
respect to the FT-3400 ow meter. The complete straight run requirements for this meter are found in
Section 3.1 on page 9 of this manual.)
2. Install each grounding ring sandwiched between (2) ANSI Class 150 anges and (2) gaskets.
3. Center each gasket on the grounding ring surface. Do not allow the gasket to protrude into the ow stream.
4. Use the torque specications provided with the gaskets when tightening the ange bolts.
5. Wire the two grounding rings together as shown and connect them to the ow meter earth wire. Connect this
to a known good earth connection. See Section 3.5.2 of this manual on page 21 for additional information on
identifying an acceptable earth connection.
Note: Refer to page 21 for best
earth-ground connection
*

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Hot Tap Grounding Probes Installation Instructions
This kit can be installed on a pressurized pipe. A hot tap drilling machine must be used to create ⅞” openings in the pipe
wall in a pressurized pipe. Once installed, this kit allows for the insertion and removal of the probes without a system
shutdown.
1. Identify an appropriate location for each probe.
2. Weld the branch outlets onto the pipe or install pipe saddles as per the manufacturer’s instructions.
3. Install the close nipples and ball valves as shown on the image. Use a paste type thread sealant.
4. Use a hot tap drilling machine with a ⅞” hole saw to drill the access hole.
5. Remove the drill and ush all debris out of the valve before installing the probes.
6. Install the grounding probes according to the instructions attached to each probe.

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Tools needed for standard installation:
• 1 5/16” wrench or adjustable wrench
• 5/8” wrench or small adjustable wrench
• Pipe wrench (to hold valve in place)
• Pipe thread sealant
3.2.7 Installing the Flow Meter
Flush, ll and pressure test the piping system prior to installing the meter. Loosen clamping nut to facilitate installation.
Clamping
nut
Keep sensor
head fully
withdrawn
during
installation.
Apply paste or
Teon tape as
necessary.
Thread hot tap
adapter on
to ball valve
and tighten as
necessary.
Maintain a rm
grip on the
enclosure when
opening valve.
Crack
valve to
test for
leaks.
CAUTION
If there are any leaks around the clamping nut or stem, DO NOT ATTEMPT TO STOP THE LEAKAGE BY
OVERTIGHTENING THE CLAMPING NUT. Damage to this nut or the clamping ring under the nut may prevent the
assembly from properly holding the meter in the pipe. The clamping nut is not part of the sealing mechanism. Any
leaks in this area indicate that the “O” ring is not sealing properly and you must contact ONICON for assistance.
WARNING
When you are ready to rell the system, make sure that all lines are lled with water before inserting the meter
into the ow stream. If the lines are not lled and this is a hot water system, some water may ash to steam and
exceed the high temperature limit for the sensor head assembly. This ash over could also exceed the pressure
ratings of the meter and the assembly could fail allowing steam and hot water to escape causing serious injury.

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Begin by calculating the eort that will be required to hold the meter. Establish adequate footing for this task, taking
extra caution when working from a ladder or platform. Use the following formula:
E=0.11 x P Where: E = eort in pounds
P = system pressure in pounds per square inch
Example: In a 300 PSI system, 33 pounds of eort is required to insert the meter into the pipe.
3.3.1 Inserting Standard Conguration Flow Meters
Step 2:
Slowly open the
valve to the full
open position.
Step 1:
Maintain a rm grip
on the enclosure
to counteract
the eects of the
pressure in the pipe.
Step 4:
Orient the enclosure to parallel with the pipe
and in alignment with the ow direction arrow.
Step 3:
Use the end of the depth gage to pierce any
insulation that may be present and rest the
gage on the outside wall of the pipe.
Step 6:
Carefully tighten
the clamping
nut. DO NOT
OVERTIGHTEN.
Step 5:
Slowly push down on
the ow meter until
the bottom of the
enclosure rests on the
top of the depth gage.
3.3 INSERTION OF THE METER
WARNING
SYSTEM MAY BE UNDER HIGH PRESSURE. When adjusting the meter position or removing it, be sure to hold the
electronics enclosure rmly by hand before SLOWLY loosening the positioning clamping nut. Failure to do this will
allow the pressure to suddenly and rapidly force the meter from the pipe causing serious injury. The meter could
also be damaged or break apart causing a break in the water seal with the resultant loss of large amounts of water.
The hand eort required to hold the meter will be 0.11 times the pipe pressure.

FT-3400 ELECTROMAGNETIC FLOW METER
727.447.6140 Page 18 onicon.com
Step 1:
Slowly loosen the position
clamping nut while
maintaining a rm grip on the
enclosure to counteract the
eect of pressure in the pipe.
Step 3:
After the meter is completely
withdrawn, slowly close the
valve to isolate ow.
Step 4:
After the valve is completely
closed, unscrew the hot tap
adapter from the valve. For hot
water meters, partially unscrew
the adapter to vent pressure
before fully removing the meter.
Step 2:
Carefully
withdraw the ow
meter stem from
the pipe until the
sensor head is
fully inside the
hot tap adapter.
3.4 REMOVAL OF THE METER
WARNING
SYSTEM MAY BE UNDER HIGH PRESSURE. When removing the ow meter, be sure to hold the electronics enclosure
rmly by hand before slowly loosening the positioning clamping nut. Failure to do this will allow the pressure
in the pipe to suddenly and rapidly force the meter from the pipe causing serious injury. The meter could also be
damaged or break apart causing a break in the water seal with the resultant loss of large amounts of water. The
hand eort required to hold the meter will be 0.11 times the pipe pressure.
IMPORTANT NOTE
Removal of the meter is the same for small pipe conguration meter installations. The clamping nut can be
accessed with the alignment tool installed.
CAUTION
The main cause of damage to meters comes from accidentally closing the valve on the sensor head. To avoid this,
gently rotate the meter by twisting the electronics enclosure back and forth (twist the stem, do not bend it) while
you slowly close the valve. If the valve touches any part of the meter, you will feel it as you are twisting the meter.
If the valve touches anything, it means the meter is not fully withdrawn. Usually a gentle twisting motion while
withdrawing the meter will clear any obstruction and permit the meter to withdraw completely. (Excessive build-up
on the stem may require the hot tap “O” ring to be lubricated with silicone.)
WARNING
In hot water systems, even a small amount of water can cause serious personal injury. Use extra caution when
working with hot water meters.
NOTE:
The hot tap
adapter will
contain a small
amount of water.

FT-3400 ELECTROMAGNETIC FLOW METER
727.447.6140 Page 19 onicon.com
3.5 WIRING CONNECTIONS
Make all connections to the attached 10 ft or 25 ft cable.
The most common causes of electronic failures are mis-wired connections during installation. When adding additional
cable, record and carefully document any substitution of wire colors. Additional cable may be purchased from ONICON
that will allow you to maintain the existing color coding.
All electrical connections to the FT-3400 must be made through the 10 ft or 25 ft cable provided with the meter. This
cable is not designed to be removed in the eld, and any attempt to do so will compromise the weather tight integrity of
the enclosure. Special care is required to ensure that the FT-3400 is connected to earth through the green/yellow earth
wire. This connection is required to prevent random electrical noise from interfering with the operation of the meter. (See
section 3.5.2 for details.)
3.5.1 Signal and Power Wiring Connections
Install meter as shown using ex conduit and junction box. Leave sucient slack in ex conduit to allow the meter to
be removed without disconnecting cable. Run factory installed meter cable to junction box through ex conduit making
connection to eld wires at this point.
CAUTION
Do not attempt to remove the existing cable or to remove the factory installed connection tting. Doing so will
compromise the weather tight integrity of the enclosure and may void the warranty.
CAUTION
Only qualied personnel should attempt to make electrical connections to the FT-3400. Failure to properly
connect the FT-3400 power, signal or earth connections may result in damage to the FT-3400 and/or to associated
peripheral equipment.
½" FNPT
conduit connection
Insertion depth
gauge provided
with each meter
FLOW
Connect factory
wires to field wires
in appropriate
junction box.
Output signal(s)
to control
system
ONICON
Display or
BTU Meter
(Optional)
Allow enough slack
in the flexible conduit
to permit the meter
to be removed
from the valve.
Typically
30" - 36"
depending on
pipe size and
height of valve
assembly.
CLEARANCE
REQUIRED
FOR INSTALLATION
Standard Installation
Kit for Steel Pipe
1" Full port ball valve
1" Close nipple
1" Branch outlet
1¼" for
hot tap
Minimum Hole Size = 1"
Must be centered
Note: Installation kits vary based on pipe material and application. For installations in pressurized (live)
systems, use "Hot tap" 1¼ inch installation kit and drill hole using a 1 inch wet tap drill.
• Install in vertical or horizontal pipe
• For horizontal pipe position meter
anywhere in upper 240˚
NOTE: Grounding rings placed before
and after the meter are required for
installation on non-metallic or lined
pipes.

FT-3400 ELECTROMAGNETIC FLOW METER
727.447.6140 Page 20 onicon.com
Wire Color Description Note
Power / Ground
Red (+) Supply voltage Connect to power supply: (+)24VDC or (+)24VAC (line)
Black (-) Isolated supply voltage common Connect to power supply: (-)DC or (-)AC (neutral)
Green / Yellow Earth ground connection Required to operate the meter
Frequency Output
Green (+) Isolated frequency output Required when connecting to ONICON display or BTU meter
Yellow (-) Frequency output common
Analog Output
Blue (+) Isolated 4-20mA analog output DO NOT POWER THE LOOP. Meter is provided with 4-20mA active
output
White (+) Isolated 0-10 V or 0-5 V analog
output Congurable 2-10V or 1-5V
Brown (-) Isolated Analog output common
Dry Contact (Scaled Pulse or Alarm)
Orange / Black
Dry Contact 1
Pulse scaled output for totalization. Examples:
1 pulse per 10 gal.
1 pulse per 100 gal.
White / Black
Gray / Black Dry Contact 2 Master Alarm Contact
Violet / Black
Gray Dry Contact 3 Bidirectional Contact
Violet
• + 4-20mA ANALOG
• + 2-10 or 1-5VDC ANALOG
• - COM
• + FREQ (for an ONICON peripheral)
• - FREQ (for an ONICON peripheral)
• VOLUME TOTAL DRY CONTACT
• VOLUME TOTAL DRY CONTACT
• MASTER ALARM CONTACT
• MASTER ALARM CONTACT
• FLOW DIRECTIONAL CONTACT
• FLOW DIRECTIONAL CONTACT
• +24V
• -COM
• EARTH GROUND
CONTROL SYSTEM
CLASS II POWER SUPPLY
BLUE
WHITE
BROWN
GREEN
YELLOW
ORANGE/BLACK
WHITE/BLACK
VIOLET/BLACK
GREY/BLACK
VIOLET
GREY
RED
BLACK
GREEN/YELLOW
Notes
• Do not power the analog output
• Flow directional contact is only available for the FT-3400-2
• Frequency output is used for ONICON peripherals
• 2 mA = Alarm in the 4-20mA signal
• 1 V = Alarm in the 2-10V signal
• 0.5V = Alarm in the 1-5V signal
• Provide a power supply with enough VA or W to power the flow meter.
The minimum input power is: 20-28 VDC, 400 mA at 24 VDC or 20-28 VAC,
60 Hz, 10 VA