Fox Thermal Instruments FT3 User manual

104488
Rev. C
Model FT3
Fox Thermal Instruments, Inc.
www.foxthermalinstruments.com | 399 Reservation Road Marina, CA. 93933
THERMAL MASS FLOW METER & TEMPERATURE TRANSMITTER

Fox FT3 Manuals:
• Fox FT3 Calibration Validation User's Guide
• Fox FT3 RS485 Modbus Manual
• Fox FT3 HART Manual
• Fox FT3 View™
Notice
Model FT3
FOX THERMAL INSTRUMENTS
2
This publication must be read in its entirety before performing any operation. Failure
to understand and follow these instructions could result in serious personal injury
and/or damage to the equipment. Should this equipment require repair or adjustment
beyond the procedures given herein, contact the factory at:
FOX THERMAL INSTRUMENTS, INC.
399 RESERVATION ROAD
MARINA, CA 93933
TELEPHONE: [phone]
FAX: [phone]
EMAIL: [email protected]
Download Technical Data Sheets from our website:
www.foxthermalinstruments.com
Fox Thermal Instruments believes that the information provided herein is accurate;
however, be advised that the information contained herein is NOT a guarantee
for satisfactory results. Specifically, this information is neither a warranty nor
guarantee, expressed or implied, regarding performance, merchantability, fitness,
or any other matter with respect to the products; nor recommendation for the use
of the product/process information in conflict with any patent. Please note that Fox
Thermal Instruments, Inc. reserves the right to change and/or improve the product
design and specification without notice.

Table Of Contents
Model FT3
TABLE OF CONTENTS
1. Introduction Page 4
2. Installation (Mechanical) Page 8
a. Insertion Type Page 9
b. Inline Type Page 13
3. Wiring (Electrical) Page 15
a. Local Wiring Page 16
b. Remote Wiring Page 17
c. Input Power Page 20
d. Signal Wiring Page 22
e. Alarm Wiring Page 24
f. Remote Switch Page 25
4. Operation (Standard Operation) Page 26
a. Start Up Page 26
b. Display Screens Page 27
c. Engineering Screens Page 28
d. Programming Page 29
e. Menu Trees Page 57
5. Maintenance Page 65
a. Troubleshooting Page 67
7. Appendices Page 74
a. Specifications Page 74
b. Agency Approvals Page 77
c. FT3 with 2 Gas Curves Page 78
d. Dimensions Page 82
e. Installation Variations Page 90
f. Warranty Page 92
g. Returning your meter Page 94
8. Glossary of Terms and Abbreviations Page 96
9. Index Page 98
3

Thank you for purchasing the Model FT3 Thermal Gas Mass Flow Meter and
Temperature Transmitter from Fox Thermal Instruments. The Model FT3 is
one of the most technically advanced flow meters in the world. Extensive
engineering effort has been invested to deliver advanced features, accuracy
measurement performance and outstanding reliability.
This Instruction Manual contains the electrical and mechanical installation
instructions as well as details for programming, maintaining and
troubleshooting the meter.
This manual is divided into the following sections: Introduction, Installation,
Wiring, Operation, Maintenance, Troubleshooting, Appendices, Glossary and
Index.
Theory of Operation
The Model FT3 is an innovative Thermal Mass Gas Flow Meter and
Temperature Transmitter. It is microprocessor-based and field programmable.
The FT3 thermal sensor operates on the law that gases absorb heat. A
heated sensor placed in an air or gas stream transfers heat in proportion to
the stream’s mass velocity. There are two sensor elements connected to
a balanced bridge circuit. One sensor element detects the gas temperature
and a second element is maintained at a constant temperature above the gas
temperature. The energy applied to the heated sensor to maintain a constant

flow velocity. The FT3 flow meter maintains accurate flow measurement over
a large temperature and pressure range.
Mass Flow
The Model FT3 measures mass flow; an advantage over other flow meters
which measure volumetric flow rate. Volumetric flow is incomplete because
temperature and pressure are unknown and must be measured separately.
For example, the mass flow of a gas depends on its temperature and
pressure. As temperature and pressure changes, the gas volume changes
but not its mass. Therefore a device measuring mass flow is independent of
temperature and pressure. The Model FT3 provides a direct measurement


measurements required.
4
Introduction
Scope
Model FT3
INTRODUCTION
www.foxthermalinstruments.com
Calibration
Validation
I/O Description
Product Description
Mass Flow
Welcome
Flow Calibration

Calibration Validation
Fox has developed a method to validate the calibration of the flow meter in


Validation is to provide operators with the ability to verify that the meter is
capturing accurate data at scheduled recalibration times - or at any time -
instead of sending the meter back to the factory for recalibration.

running accurately by testing the functionality of the sensor and its associated
signal processing circuitry. This test can be done in the pipe and in normal

effectiveness and sensibility of the sensor at a "no flow" condition.
Flow Calibration



describe specific instrument details that can be sorted by serial number, tag
number or customer purchase order.

size and other information. All NIST-traceable equipment utilized for the
calibration procedure is identified, as is the calibration history of all reference
equipment.

current outputs with scaled units of flow is produced for each calibrated
device.
I/O Description
The FT3 features two galvanically isolated 4 to 20mA analog outputs:
one isolated digital output that can be used for frequency or alarm, one
programmable discrete input and a USB connection for communication with a

flow meter readings and permits flow meter configuration.
The first 4 to 20mA output is for flow rate. The second 4 to 20mA output
can be configured either for flow rate or process gas temperature. Both
5
Introduction
Calibration
Validation
I/O Description
Model FT3
INTRODUCTION
399 Reservation Road, Marina, CA 93933 Ph: 831.384.4300 Fax: [phone]
Flow Calibration

F1 F2 F3 F4
IR (infrared) Buttons
Display Window
Push Buttons
4 to 20mA outputs can be scaled by the user. The frequency output is
programmable to represent flow rate and can be scaled for maximum flow/
maximum frequency, units-per-pulse or pulse-per-units. The maximum



flow meter.
FT3 Optional Display Panel & Configuration Panel

in user selectable units, process gas temperature, elapsed time (number

allows the user to change a variety of settings including 4 to 20mA scaling,
frequency output scaling, flow and temperature units, reference temperature


The FT3 display is a 2 line x 16 character display with 4 mechanical and 4


be disabled when the meter is used in snow or ice in order to avoid false key
detection.

6
Model FT3
INTRODUCTION
www.foxthermalinstruments.com
Introduction
Display

F1 F2 F3 F4
Standard I/O
4 to 20 mA Flow
Contact Input
4 to 20 mA Flow or Temperature
Frequency or Alarm
USB
(Free FT3 View Software)
Outputs and Communications are Galvanically Isolated
Optional Digital Communications
HART
RS485 Modbus
24VDC Input Power
85-264VAC Optional
Optional Display and
Conguration Panel
Standard Digital Communications
FT3 Functional Diagram
The Fox Model FT3 provides two isolated 4 to 20mA outputs: one for flow
rate and a second programmable for flow rate or temperature. An optional

rate, total flow, elapsed time, process gas temperature and alarms. The

configuration of flow meter settings such as 4 to 20mA scaling, pulse output
frequency scaling, pipe area, zero flow cutoff, flow filtering or damping,
display configurations, diagnostics and alarm limits.
Fig. 1.2: FT3 Functional Diagram
FT3 Functional
Diagram
7
Model FT3
INTRODUCTION
399 Reservation Road, Marina, CA 93933 Ph: 831.384.4300 Fax: [phone]
Introduction

Scope
This section describes how to install the Fox Model FT3 Flow Meter and how
to get started. Installation methods will vary according to the flow meter type

For Insertion Types:
1. Determine lateral position on the pipe
2. Sensor installation depth
3. Sensor orientation in relation to sensor length and direction of flow
4. 
For Inline Types:
1. Determine lateral position on the pipe
2. Flow body orientation in relation to direction of flow in pipe
3. 
Installation procedures must be performed using a combination of the end
user’s best engineering practices, in compliance with local codes, and
manufacturer’s recommendations.
General Precautions
The following general precautions should be observed:
1. Exercise care when handling the flow meter to avoid damaging the probe,
sensor or enclosure.
2. The enclosure covers must be closed except during installation.
3. Mounting FT3 in direct sunlight can cause the temperature inside the

display and reduced component life. It is recommended that a sunshade
be installed to avoid direct sunlight.
4. Ensure the flow direction arrow points in the direction of flow.
 Do not install the FT3 enclosure near an igniter, igniter-controller or
switching equipment.
6. Do not install an external power supply in a cabinet containing an
igniter controller or switching equipment.
7. Ensure that good engineering practices and applicable industry codes are
followed throughout the installation process.
 For accurate flow measurement: review flow meter placement
instructions before installation to ensure a proper flow profile in the pipe.
Installation - Model
FT3 Flow Meter
8
Model FT3
INSTALLATION
Installation: General
Insertion Flow Meter
Lateral Placement

FLOW
10X Pipe ID
Proper
Prole
15X Pipe ID
Irregular
Prole
F1 F2 F3 F4
F1 F2 F3 F4
i
Instructions for Insertion Flow Meter Lateral Placement
Install the Model FT3 Insertion style flow meter so that it is far enough away
from bends in the pipe, obstructions, or changes in line sizes to ensure a
consistent flow profile. Fifteen diameters of straight pipe upstream and ten
downstream are recommended.
For example, a 2" pipe would require 30" upstream and 20" downstream, but
a 4" pipe would require 60" upstream and 40" downstream.
Note: The probe diameter is 1/2".

Special Conditions of Use:
 
flameproof joints is necessary.
 Follow the manufacturer's instructions to reduce the potential of an
electrostatic charging hazard.
9
Installation: Insertion Type
Model FT3
INSTALLATION
Insertion Flow Meter
Lateral Placement

Half Coupling,
3/4" NPT Female
( Supplied by
Customer
)
Compression Fitting
(Supplied by Fox)
Customer’s Pipe
.87" (22.098 mm)
L
C
Probe Diameter, 1/2”
F1 F2 F3 F4
Installation Depth
The installation depth of the sensor in the pipe is dependent on the pipe size.
To get the most accurate reading, proper placement of the sensor window
within the pipe is necessary. As shown in Fig 2.2, the end of the sensor


10
Installation: Insertion Type
Model FT3
INSTALLATION
Installation Depth Sensor Orientation -
Direction of Flow

F1 F2 F3 F4
FLOW
Pipe
Flow Direction Arrow
+10°
-10°
FLOW
FLOW
i
Fig. 2.3: Orientation of Insertion Type Flow Meter
Note: Some flow meters are shipped with the sensor elements that are offset (see


suited for your application. Follow the appropriate sensor orientation instructions.
Unequal Length Sensor Elements
Install the shorter sensor element upstream from the longer one.

11
Installation: Insertion Type
Model FT3
INSTALLATION
Sensor Orientation -
Direction of Flow
Sensor Orientation
- Unequal Length
Sensors

+10°
-10°
FLOW
FLOW
i
Equal Length Sensor Elements
Install flow meter with both sensor elements facing the flow stream within


Insertion Mounting Instructions - Compression Fittings

coupling provided in the customer's pipe. Insertion style flow meters are not
designed for use in pipes smaller than 1½".
  
coupling.
 
past the center line of the pipe and tighten the compression fitting nut

 When installing into a 1½" pipe carefully install the probe into the
pipe until it touches the opposite wall and pull back 0.1". Tighten the
compression fitting nut.
Caution: Once the compression fitting is locked onto the probe, the probe
can be removed or rotated, but the insertion depth is locked in place.
Note: Do not overtighten compression fitting.

While holding the fitting body steady, tighten the nut one and one-quarter turn to the 9 o'clock position.
Installation: Inline Type
Flow Meter
Placement -
Inline Type
12
Model FT-3
INSTALLATION
12
Installation: Insertion Type
Model FT3
INSTALLATION
Mounting -
Insertion Type
Sensor Orientation
- Equal Length
Sensors

FLOW
4X Pipe ID
Proper
Prole
8X Pipe ID
Irregular
Prole
F1 F2 F3 F4
F1 F2 F3 F4
Instructions for Inline Flow Meter Placement
Install the Model FT3 Inline style flow meter so that it is far enough away
from bends in the pipe, obstructions, or changes in line sizes to ensure a
consistent flow profile. Eight diameters of straight pipe upstream and four
downstream are recommended.
For example, a 2" pipe would require 16" upstream from the edge of the flow

pipe would require 32" upstream and 16" downstream.
The Model FT3 is welded, threaded or flanged to the customer’s pipe.

the same diameter as the Model FT3 flow body or errors in flow readings
can occur. The installation procedure should be a combination of the end
user’s best engineering practices, in compliance with local codes, and the
manufacturer’s recommendations.
See Figure 2.7 for a detailed look at upstream and downstream pipe
diameters for inline meters.

13
Installation: Inline Type
Flow Meter
Placement -
Inline Type
Model FT3
INSTALLATION

FLOW
Flow Body
F1 F2 F3 F4
Inline Orientation
Install the flow body so that the engraved arrow on the fitting and the arrow
on the flow body are pointing with the direction of flow.

Tightening Compression Fittings
The compression fitting has been placed according to the proper depth in the
flow body by Fox factory technicians. After the flow body has been correctly
fitted to the process pipe, the compression fitting may need to be tightened

Note:
 

tests if you plan to perform these tests in the pipe.
 

pipe.
Wiring: General
Scope
Precautions
Power Wiring
14
Installation: Inline Type
Mounting - Inline
Type
Flow Body
Orientation -
Inline Type
Model FT3
INSTALLATION
Signal Wiring

Wiring Instructions
The FT3 enclosure has two separate conduit entries. The installation must maintain
separation between input power and output signal wiring. Wiring is accomplished
by removing the wiring compartment cover. Bring customer-supplied wires into

for a minimum service loop.
Wiring Precautions
 
 
 All plumbing and electrical installations of flow meters must be in
compliance with local codes, the end user’s best engineering practices, and
manufacturer’s recommendations.
 Do not install the FT3 enclosure near an igniter, igniter-controller or
switching equipment.
 Do not install an external power supply in a cabinet containing an
igniter controller or switching equipment.
 This flow meter contains components that can be damaged by static electricity.
You must discharge yourself by touching a grounded steel pipe or other
grounded steel material prior to working inside this flow meter.
 For the remote sensor option, the serial number of the electronics enclosure
must match the remote sensor probe.
 
Power Wiring
For power wiring, use stranded copper wire, no larger than 16-gauge. If


Grounding
The enclosure must be properly grounded with a quality earth ground to protect the
electronics from static discharges. 16 gauge, stranded wire is recommended.
Signal Wiring

twisted pair shielded cable. The cable shield should not be connected at the




15
Wiring: General
Scope
Precautions
Power Wiring
Model FT3
WIRING
Grounding
Signal Wiring

2x 3/4 inch NPT Female F1 F2 F3 F4
Signal
Wiring
Input
Power
i
Local Wiring

meters.

Signal Wiring includes:
4 to 20mA, pulse, alarm output, contact input, remote sensor, USB, and

Note:
Serial numbers: If you have more than one meter, you must ensure
that the serial numbers of the probe/J-Box, remote electronics,
housing, and/or flow body match one another. These items have
been manufactured and calibrated to operate as a unit and cannot be
mismatched.
Installation wiring: Obtain the correct length for the FT3 power and
signal wires using one of these methods:
 

 Trim the wires to extend 6 inches from the end of the conduit before
it is attached to the FT3.
16
Wiring: Local Sensor
Model FT3
WIRING
Local Wiring

2X 3/4 " NPT,
Female
Remote Cable, 5 Conductor,
Shielded, 100ft (30.48m) Max.
F1 F2 F3 F4
Input
Power
Signal Wiring
Remote Wiring

meters.

Signal Wiring includes:
4 to 20mA, pulse, alarm output, contact input, remote switch, USB, and

17
Wiring: Remote Sensor Option
Model FT3
WIRING
Remote Wiring
Helpful Wiring Hints:
1. Identify proper wire routing conduit ports before wiring the meter.
2. 
local & remote models.
3. Maximum installation length between the main enclosure and

4. 
 
 
 
 Fox recommends that you use a small standard screwdriver to
connect wires in enclosure.
6. 

i

Note: Remote wiring is only required when the Remote Electronics option
is provided.
Five wire shielded cable required. The shielded cable should be run through

If you are using your own cable, make sure that the cable length does not


Do not connect the cable shield at the electronics enclosure end.
Use an extension cable to connect the terminals of the remote probe
enclosure to connector TS3 of the electronics enclosure as shown in Figures

18
Wiring: Remote Sensor
Model FT3
WIRING
Remote Sensor
Cable Wiring
i

TS4
24V
OUT
TS
5
TS1
F1
J2
1
24V,0.75A
2 3
-2 +1
TS3
#4
#6
#3
#5
#2
#1
Black Dot Denotes Pin #1
Cable Shield
Electronics Enclosure
RED
RED
WHT
WHT
GRN WHT
Shield
GRN
BRN
YEL
BLK
RED
Probe Sensor Wired By Fox
SENSOR
RED*
BLK*
BRN*
WHT*
GRN*
1
2
3
4
5
RED
RED
YEL
WHT
WHT
Remote Enclosure
Sensor Wires

*Wire colors listed here represent the wire colors of cables supplied by
Fox. Colors may vary if customer is supplying their own cable.

19
Model FT3
WIRING
Wiring: Remote Sensor
Electronics Enclosure
Terminal Numbers



Terminal Numbers
Sensor Wire

1 1
2 Black 2 
3 Brown 3 Yellow
 Shield 4 Green
4 White White
Green 6 White
Remote Sensor
Cable Wiring
Input Wiring
Remote Sensor

Power Input Requirements: 24VDC Supply

The enclosure must be properly grounded with a quality earth ground.

ground.

4-20
FLOW
TS4
24V
OUT
4-20
#2
Red 1
Red2
Yel 3
Wh 4
Wh 5
PULSE
/ALM
TS2
TS1
F1
J2
1
24V, 0.75A
2 3
IN
+1
-2 +1
-2
+3
-4
+5
-6
+7
-8
TS3
REMOTE
SENSOR
Earth Ground
24V Return
+24VDC
Caution:
 
20
Model FT3
WIRING
Wiring: Input Power
Power Input Wiring Power Input Wiring