Fox FT2 User manual

MODEL FT2
THERMAL MASS FLOWMETER & TEMPERATURE TRANSMITTER
399 RESERVATION ROAD
MARINA, CA 93933
101364 Revision I

Revision I ECO0666 3/25/10
Notice
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: [e-mail]
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.
101364 Revision I

TABLE OF CONTENTS
1. Introduction .....................................................................................................1
1.1. Scope .............................................................................................................................................................1
1.2. Product Description .......................................................................................................................................1
1.3. Block Diagram...............................................................................................................................................2
1.3.1. Menu Tree..............................................................................................................................................3
1.4. Analog 4-20 mA outputs ...............................................................................................................................5
1.5. Discrete I/O....................................................................................................................................................5
1.6. Frequency/Alarm Output...............................................................................................................................5
1.7. Local Display Options...................................................................................................................................5
1.8. Communication Features...............................................................................................................................5
1.9. Dimension Details .........................................................................................................................................5
2. Installation......................................................................................................10
2.1. Scope ...........................................................................................................................................................10
2.2. Insertion Style..............................................................................................................................................10
2.2.1. Mounting – Insertion Style ..................................................................................................................10
2.2.2. Installation Depth.................................................................................................................................11
2.2.3. Sensor Orientation ...............................................................................................................................11
2.2.4. Flowmeter Placement - Insertion Style................................................................................................13
2.2.5. Flowmeter Placement - Flow Body Style............................................................................................14
2.2.6. Flow Body Orientation ........................................................................................................................15
3. Start Up ..........................................................................................................16
3.1. Scope ...........................................................................................................................................................16
Note: All references to conduit orientation are from the Front Panel perspective...................................................16
3.2. Wiring..........................................................................................................................................................16
3.2.1. Power Input Wiring and Grounding ....................................................................................................17
3.2.2. 4 to 20 mA Output Wiring...................................................................................................................18
3.2.3. Frequency/Alarm Output Wiring.........................................................................................................19
3.2.4. RS485 Wiring......................................................................................................................................20
3.2.5. Remote Switch Wiring.........................................................................................................................21
3.2.6. Sensor Wiring (4 wires).......................................................................................................................22
3.2.7. Remote Wiring Installation..................................................................................................................23
3.3. Start Up Sequence........................................................................................................................................24
3.4. Measurement Mode.....................................................................................................................................24
3.5. 4 to 20 mA Outputs......................................................................................................................................24
3.6. Frequency/Alarm Output.............................................................................................................................24
3.7. Local Display Screens .................................................................................................................................25
3.7.1. Display Screens ...................................................................................................................................25
3.7.2. Engineering Screens ............................................................................................................................26
3.8. Resetting Total and Elapsed Time...............................................................................................................27
3.9. Alarm Indications ........................................................................................................................................27
4. Programming.................................................................................................28
4.1. Programming using the Local Display ........................................................................................................28
4.1.1. Data Entry using the local display module ..........................................................................................28
4.1.2. Entering the Programming Mode.........................................................................................................29
4.1.3. Analog 4-20 mA Output......................................................................................................................29
4.1.4. Frequency Output ................................................................................................................................30
4.1.5. Discrete Input/Output ..........................................................................................................................32
4.1.6. RS485 Serial Communication Settings................................................................................................33
4.1.7. Display Setup.......................................................................................................................................35
4.1.8. Password..............................................................................................................................................36
4.1.9. Units Settings.......................................................................................................................................37
4.1.10. Flow Parameters ..................................................................................................................................39
4.1.11. Calibration Parameters.........................................................................................................................42
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TABLE OF CONTENTS … CONTINUED
4.1.12. Reset Total and Elapsed Time .............................................................................................................43
4.1.13. Restore Database .................................................................................................................................43
4.1.14. Reset CRC ...........................................................................................................................................43
4.1.15. Simulation............................................................................................................................................44
5. Preventative Maintenance............................................................................46
5.1. Access to Electronics...................................................................................................................................46
5.2. Sensor Cleaning...........................................................................................................................................46
5.3. Broken or Damaged Probe...........................................................................................................................46
5.4. Calibration...................................................................................................................................................46
5.5. Fuse Replacement (Standard and NFP version) ..........................................................................................46
6. Troubleshooting.............................................................................................47
6.1. Replacements Parts......................................................................................................................................48
6.2. Return Procedure.........................................................................................................................................49
Warranty.................................................................................................................50
Glossary of Terms and Abbreviations.................................................................51
Index........................................................................................................................52
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101364 Model FT2
1. Introduction
1.1. Scope
This Instruction Manual describes the electrical and mechanical considerations involved with installing
and maintaining the hardware associated with the Fox FT2 Thermal Mass Flowmeter and Temperature
Transmitter.
This manual is divided into the following sections:
Introduction:
Installation:
Start up:
Programming:
Preventive maintenance:
Troubleshooting:
1.2. Product Description
Theory of Operation
The Model FT2 is an advanced thermal mass flowmeter with temperature transmitter. It is
microprocessor-based and field programmable. The FT2 thermal sensor operates on the law that fluids
absorb heat. Therefore, a heated sensor placed in an air or gas stream transfers heat in proportion to
the stream’s mass velocity. There are two sensors in different legs of a balanced bridge circuit, one
sensor detects the fluid’s temperature and a second sensor is maintained at a constant temperature
(constant ΔT) above the fluid’s temperature. The energy applied to the heated sensor to keep this
constant temperature difference is directly proportional to the mass of the flow velocity. The bridge
circuit maintains accurate flow measurement over a large temperature and pressure range.
Mass Flow
The Model FT2 measures mass flow, an advantage over most flowmeters, which measure volumetric
flow rate. Volumetric flow is incomplete because temperature and pressure are unknown and must be
measured separately. For example, the volume of a gas depends on its temperature and pressure. As
temperature and pressure changes, the gas volume changes but not it’s mass. Therefore a device
measuring mass flow is independent of temperature and pressure. By defining a Standard at 70° F and
1 Atmosphere (14.7 psia), 1 Standard cubic foot of gas equals the mass that is in 1 cubic foot of this
gas at 70° F and 1 Atmosphere.
The Model FT2 provides a direct measurement of Standard or Mass units with no additional
temperature and pressure measurements required.
I/O Description
The FT2 comes with two industry standard 4-20 mA isolated analog outputs, one isolated digital
output that can be used for frequency or alarm output, one programmable discrete input and a RS232
communication channel that can interface to a Palm™ handheld or a PC. The two 4 -20 mA outputs
are scalable for the 4 and 20 mA values and are assigned to flow rate and temperature. The frequency
output is programmable to represent flow rate and can be programmed using span/maximum
frequency, unit per pulse or pulse per units. The maximum frequency is 100 Hz. An optional Modbus
protocol is available in a configurable full or half duplex RS485 interface. In addition, a local display
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Model FT2 101364
and keypad for field programming the flowmeter and a serial communication channel for Profibus,
DeviceNet or Ethernet are also available as options.
1.3. Block Diagram
The main parts of the FT2 Mass Flowmeter are: The FT2 main board, the sensor assembly, an
optional front panel, and an optional power supply. The two PCBs are mounted inside of the enclosure
and the sensor assembly is mounted external to the enclosure. The optional power supply is mounted
under the main PCB.
Figure 1-1 Block Diagram
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101364 Model FT2
1.3.1. Menu Tree
*
*
*
*
*
* ONLY available for MODBUS
PASWD=
UP DN NXT O
K
SET PARAMETERS
I/O FLO DSP EXIT
SET I/O
I
/
O FE
Q
420 EXIT
SET I/O
COM CTC EXIT
Bus = Modbus
NXT O
K
Baud = 9600
NXT O
K
Parity = EVEN
NXT O
K
Data Bits = 8
NXT O
K
Stop Bits = 1
NXT O
K
LoopID = 1
CHG O
K
CONTACT
INP ALM EXIT
Inp = Not Used
NXT O
K
ALM = HiFloAlm
NXT O
K
HiFloAlm=0 SCFM
CHG O
K
DISPLAY/PASSWORD
FLOW PARAMETERS
SET 4-20 MA
FLO TMP EXIT
20mACnt=4091
CHG O
K
4mACnt=3
CHG O
K
20 mA=3750 SCFM
Level2
Level2
If password is accepted
CHG O
K
4 ma=0 SCFM
CHG O
K
20mACnt=4093
CHG O
K
4mACnt=5
CHG O
K
20 mA=112 °F
CHG O
K
4 mA=10 °F
CHG O
K
RS485
FREQUENCY OUTPUT
P/U U/ P FE
Q
EXIT
PLS/UNT = 12.56
CHG O
K
MAXFREQ=100 hz
CHG O
K
MAXFLO= 100 SCFM
CHG O
K
UNT/PLS=0.876
CHG O
K
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Model FT2 101364
FLOW PARAMETERS
**
** ONLY for Kg/ and LB/
FLOW PARAMETER 1
SIM UNT PRM EXIT
FloSim=0 SCFM
CHG O
K
TmpSim=0 °F
CHG O
K
CsvSim=0 V
CHG O
K
FLO UNT=SCFM
NXT O
K
TMP UNT=°F
NXT O
K
TmpRef= 60 °F
CHG O
K
PRES UNT=mmHG
NXT O
K
PresRef=760
CHG O
K
DNS = 0.9234 Kg/M3
CHG O
K
FLOW PARAMETER 2
CAL SPC PRM EXIT
Volt1=0.9345
CHG PRV NXT EXIT
Flo1=0.0
CHG PRV NXT EXIT
Volt20=1.245
CHG PRV NXT EXIT
Flo20=3756
CHG PRV NXT EXIT
CalDate= 12/7/03
CHG O
K
ENABLE SIM ?
YES NO
Level 2
RtdHiRes=282.4 Ohm
CHG O
K
RtdHi_F=300 °F
CHG O
K
RtdLoRes=192.1 Ohm
CHG O
K
RtdLo_F=70 °F
CHG O
K
AdcF=0.0005893
CHG O
K
Rx= 49.9 Ohm
CHG O
K
ShResOfst=0
CHG O
K
Tsv_rt=0.197656
CHG O
K
R20_value=2.5
CHG O
K
Cutoff=1.0 SCFM
CHG O
K
A2=0.0865 FT^2
CHG O
K
Filter=0.5
CHG O
K
HiFloAlm=0 SCFM
CHG O
K
LoFloAlm=0 SCFM
CHG O
K
HiTmpAlm=0 °F
CHG O
K
LoTmpAlm=0 °F
CHG O
K
Restore Database?
Yes No
DISPLAY/PASSWORD
DSP PSW EXIT Reset CRC?
Yes No
DISPLAY/PASSWORD
Level2
Level2
Level2
Level2
Level2
Level2
Level2
Level2
Level2
Level2
PASSWD=1234
CHG O
K
DSP1L1= Flo Rate
NXT O
K
DSP1L2= Flo Total
NXT O
K
DSP2L1= Temp
NXT O
K
DSP2L2= Elps time
NXT O
K
ALTERNATE=Off
NXT O
K
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101364 Model FT2
1.4. Analog 4-20 mA outputs
Two industry standard 4-20 mA isolated analog outputs are available to monitor flow rate and
temperature. Each output is scalable for the 4 and 20 mA values. See the programming section for
details.
1.5. Discrete I/O
One discrete input is available for remote resetting of the totalizer and elapsed time.
One isolated discrete output is available for generating an alarm for High or Low limits for temperature
or flow rate, if the output is not used for the pulse output.
1.6. Frequency/Alarm Output
One isolated frequency output is available to monitor flow rate and is typically used for totalization.
The maximum frequency output is 100 Hz. The output can be scaled by using the flow setting and
maximum frequency or using the pulse per unit or unit per pulse method of entry. The isolated digital
output can be used either as a frequency output or an alarm output but not both. The output type is
selected by JP1.
1.7. Local Display Options
An optional front panel with a LCD display and keypad is available to display measured data and
allow field programming of the flowmeter. The display is an easy to read, two-lines, 16 characters
backlit LCD and 4 function keys. The local display/keypad module is wired to the FT2 electronics
through connector TS6. TS6 is on the main board. Refer to the Programming section for a detailed
explanation of its usage.
1.8. Communication Features
The FT2 offers a RS232 serial link that communicates to a Palm™ PDA handheld or with a PC
application for data display and programming. Also, RS485 is available to connect to the optional
front panel with an interface to a specific bus converter (Profibus, DeviceNet or Ethernet). The RS485
can connect directly as an optional Modbus interface. Only one bus protocol is supported at one time.
1.9. Dimension Details
Figure 1-2 Enclosure Mounting Dimensions
Rear View of enclosure without sensor or
conduit. AC power enters on one side, DC
power and signals enter on the other side.
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Model FT2 101364
Figure 1-3 Dimensions for Flow Body Style with NPT Connections
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101364 Model FT2
Figure 1-4 Dimensions for Flow Body with Flange Connections
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Model FT2 101364
Figure 1-5 Dimensions for Insertion Style
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101364 Model FT2
Figure 1-6 Dimensions for Remote NEMA 4 Enclosure
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Model FT2 101364
2. Installation
2.1. Scope
This section describes how to install the FT2 flowmeter and how to get started.
The following, general precautions should be observed:
a. Exercise care during handling to avoid damaging the probe, sensor or enclosure.
b. The enclosure cover must be closed except during installation and programming.
c. Mounting FT2 in direct sunlight can cause the temperature inside the enclosure to increase
beyond design limits, resulting in failure of the LCD display and reduced component life. It
is recommended that a sunshade be installed to avoid direct sunlight.
d. Ensure that the arrow on the flow body is pointing in the direction of flow.
e. Do not install the FT2 enclosure near an igniter, igniter controller or switching equipment.
f. Do not install an external power supply in a cabinet containing an igniter controller or
switching equipment.
g. Do not power the power supply with an AC power source that is also used to power an igniter
or igniter controller.
2.2. Insertion Style
2.2.1. Mounting – Insertion Style
The Model FT2 is mounted through a ¾-inch hole and a ¾-inch female NPT half coupling
provided in the customer’s pipe. Installation procedures must be a combination of end user’s best
engineering practices, in compliance with local codes, and manufacturer’s recommendations.
Insertion style flowmeters are not recommended for pipes smaller than 1½”.
Figure 2-1 Insertion Style
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101364 Model FT2
2.2.2. Installation Depth
Note: Some flowmeters are shipped with sensors that have equal length elements (see Figure 2-2).
Others are shipped with the sensor elements that are offset (see Figure 2-3). The sensor type supplied
was selected at the factory to be the best suited for your application. Follow the appropriate sensor
orientation instructions below. (Refer to Figure 1-5)
a. Install the compression fitting into the ¾-inch female NPT half coupling.
b. When installing in a 2-inch pipe or larger, install the end of the probe 0.87-inch past the
centerline of the pipe and tighten the compression fitting nut. Refer to Figure 2-1.
c. When installing into a 1½-inch pipe carefully install the probe into the pipe until it touches the
opposite wall and pull back 0.1-inch. 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.
2.2.3. Sensor Orientation
Equal length sensor elements:
Install flowmeter with both sensor elements facing the flow stream within +/-10 degree.
Figure 2-2. Equal Length Sensor Elements.
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Model FT2 101364
Unequal length sensor elements:
Install the shorter sensor element upstream from the longer one.
Figure 2-3 Unequal Length Sensor Element
Note: In extreme low flow measurements (below 30 standard feet per minute), convection heat
from the longer probe can affect the shorter probe. In these applications, chose a mounting that
prevents this from occurring (ex. Horizontal mounting).
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101364 Model FT2
2.2.4. Flowmeter Placement - Insertion Style
Install the Model FT2 Insertion style flowmeter 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.
Figure 2-4 Flowmeter Placement – Insertion Style
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Model FT2 101364
2.2.5. Flowmeter Placement - Flow Body Style
Install the Model FT2 Inline style flowmeter 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.
The Model FT2 is welded, threaded or flanged to the customer’s pipe. Care should be taken to
ensure that the diameter of the mating pipe is the same diameter as the Model FT2 flow body or
errors in flow readings can occur. Installation procedure should be a combination of the end
user’s best engineering practices, in compliance with local codes, and the manufacturer’s
recommendations.
Figure 2-5 Flowmeter Placement - Flow Body Style
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101364 Model FT2
Figure 2-6 Flow Body Style
2.2.6. Flow Body Orientation
Install the flow body so that the arrow on the outside of the flow body is in the direction of flow.
This will ensure the correct sensor orientation.
Note: In extreme low flow measurements (below 30 standard feet per minute), convection heat
from the longer probe may affect the shorter probe (see Figure 2-3, View A-A). In these
applications, chose a mounting orientation that prevents this from occurring (ex. horizontal
mounting).
Figure 2-7 Flow Body Orientation
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Model FT2 101364
3. Start Up
3.1. Scope
This section describes the steps needed to get the FT2 Flowmeter running.
The enclosure has two separate conduit entries to maintain separation between AC input power and
output signal wiring. To eliminate the possibility of noise interference, use a separate cable entry for
AC power and signal lines.
Figure 3-1 Input Wiring
Note: All references to conduit orientation are from the Front Panel perspective.
3.2. Wiring
Warning! All installation procedures must be performed with power Off.
All plumbing and electrical installations of flow meters must be a combination of the end user’s best
engineering practices, in compliance with local codes, and the manufacturer’s recommendations.
•Do not install the FT2 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.
•Do not power the power supply with an AC power source that is also used to power an igniter or
igniter controller.
Wiring Installation
Warning! This flowmeter 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 flowmeter.
Wiring is accomplished by loosing the 4 captive screws holding the cover of the enclosure to expose
the electronic circuit boards. Bring customer supplied wires into the enclosure through the conduit
access on the sides of the enclosure. Cut wires for a 2-inch service loop. Use stranded copper wire, no
larger than 16-gauge. If you are using the optional AC power supply, connect the two AC wires and
the safety ground to the TS7 connector marked as AC (bring AC wires in through the left-hand conduit
hub). If an external 24 VDC power source is used, it is recommended that a twisted shielded pair cable
Page 16 Fox Thermal Instruments, Inc., 399 Reservation Road, Marina, CA 93933