FAHM HART FT3351 Series User manual
SMART Pressure Transmitter
FT3351 Series User Manual July.2022
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Contents
FT3351 SERIES WITH HART®REVISION SELECTABLE PROTOCOL 1
1. INTRODUCTION 4
1.1 Preface 4
1.2 Transmitter overview 4
1.3 FT3351 features 5
2. HARDWARE INSTALLATION 5
2.1 General considerations 6
2.2 Environmental considerations 6
2.3 Installation Process 7
2.3.1 Dimension 7
2.3.2 Mount the Transmitter 7
2.3.3 Housing rotation 10
2.4 Electrical considerations 10
2.4.1 Conduit installation 10
2.4.2 Wiring 11
2.4.3 Grounding 12
3. CONFIGURATION 13
3.1 LCD display 13
3.2 Device setup 13
3.2.1 Device Mode 14
3.2.2 Primary Variable 14
3.2.2.1 Unit 14
3.2.2.2 Max Range and Min Range and Transfer function 16
3.2.2.3 Decimal point 16
3.2.2.4 Damping Value 17
3.2.2.5 Low Trimming 17
3.2.3 Custom Variable 18
3.2.3.1 Max Range and Min Range and Transfer function 18
3.2.3.2 Decimal point 19
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3.2.4 LCD Parameters 19
3.2.5 Analog Output Parameters 20
Communication Parameters 20
3.2.6 Tank application parameters 21
3.2.6.1 Level unit 22
3.2.6.2 Volume unit 23
3.2.6.3 Mass unit 24
3.2.6.4 Density unit 24
3.2.6.5 Basic parameters 25
3.2.6.6 Desired variable range 26
3.2.7 Reset Factory 27
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1.Introduction
1.1 Preface
Welcome to use smart pressure transmitter, please read this manual before working with the
product. For personal and system safety, and for optimum product performance, make sure you
thoroughly understand the contents before installing, using, or maintaining this product.
1.2 Transmitter overview
The FT3351 are used to measure differential pressure, gauge pressure, absolute pressure
parameters for gas, liquid, vapor, widely applied in petroleum, metallurgy, chemicals, power,
light industry, mechanical and environmental protection fields. The FT3351 utilizes capacitance
sensor technology and piezo resistive sensor technology for pressure measurements. The major
components of the FT3351 are the sensor module and the electronics housing. The sensor
module contains the oil filled sensor system (isolating diaphragms, oil fill system, and sensor) and
the sensor electronics. The sensor electronics are installed within the sensor module and include
a temperature sensor, a memory module, and the capacitance or resistance to digital signal
converter (A/D converter). The electrical signals from the sensor module are transmitted to the
output electronics in the electronics housing. The electronics housing contains the output
electronics board, the optional local operator Interface (LOI) buttons, and the terminal block.
Powerful interface features without hand held communicator are able to ensure good
interaction. For the FT3351 design, pressure is applied to the isolating diaphragms then the oil
deflects the center diaphragm and as a result the sensor element capacitance or resistance will
be changed. This signal is then changed to a digital signal in the A/D converter. The
microprocessor takes the signals from the pressure and temperature sensor and calculates the
correct output of the transmitter. LCD indicator can display the digital pressure, temperature,
current some kinds of physicals and 0-100% analog indication. In case of non-standard pressure
source, parameter setting zero shift, range setting damping adjustment can be done by press key
button; and also recalibration on the transmitter are greatly convenient for on-site calibration
(see Figure 1) .
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1.3 FT3351 features
◆Best-in-Class performance with 0.075% reference accuracy.
◆Traditional platform enables integrated pressure, flow and level solutions.
◆Power Advisory Diagnostics provide predictive visibility to the health of entire electrical loop.
◆Local Operator Interface (LOI) offers easy to use configuration capabilities at the transmitter.
◆Selectable HART™Revision prepares your plant for the latest HART capabilities while ensuring
seamless integration with today's systems.
◆ Excellent long term stability of ±0.1% URL per year.
◆ Low Temperature Drift of ±0.1% URL in full range of ambient temperature (-40 ... 85°C).
◆ Easy installation with all solutions fully assembled, leak-tested and calibrated
2. Hardware Installation
Figure 1 FT3351 pressure transmitter
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The information in this section covers installation considerations for the FT3351 with HART
protocols.
2.1 General considerations
Measurement accuracy depends upon proper installation of the transmitter and impulse piping.
Mount the transmitter close to the process and use a minimum of piping to achieve best
accuracy. Keep in mind the need for easy access, personnel safety, practical field calibration, and
a suitable transmitter environment. Install the transmitter to minimize vibration, shock, and
temperature fluctuation. Procedures and instructions may require special precautions to ensure
the safety of the personnel performing the operation. Explosions could result in death or serious
injury: installation of this transmitter in an explosive environment must be in accordance with
the appropriate local, national, and international standards, codes, and practices. Please review
the following safety messages for any restrictions associated with a safe installation
◆In an Explosion-Proof/Flameproof installation, do not remove the transmitter covers when
power is applied to the unit. Process leaks may cause harm or result in death.
◆Install and tighten process connectors before applying pressure.
◆Avoid contact with the leads and terminals. High voltage that may be present on leads can
cause electrical shock. Electrical shock can result in death or serious injury.
◆Install and tighten all flange bolts before applying pressure.
◆do not attempt to loosen or remove flange bolts while the transmitter is in service.
◆improper assembly of manifolds to traditional flange can damage sensor module. For safe
assembly of manifold to traditional flange, bolts must break back plane of flange web (i.e., bolt
hole) but must not contact sensor module housing.
2.2 Environmental considerations
Best practice is to mount the transmitter in an environment that has minimal ambient
temperature change. The transmitter electronics temperature operating limits are –40 to 185 °F
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(–40 to 85 °C). Mount the transmitter so that it is not susceptible to vibration and mechanical
shock and does not have external contact with corrosive materials.
2.3 Installation Process
2.3.1 Dimension
Standard FT3351 Dimensional Drawings shown in Figure 2 and Figure 3.
Figure 3 .FT3351 Dimensional Drawings
2.3.2 Mount the Transmitter
The FT3551 pressure transmitter can be mounted directly on the manifold. A mounting bracket
for wall or pipe mounting (2" pipe) is also available as an accessory. Ideally, the pressure
transmitter should be mounted in a vertical position to prevent subsequent zero shifts. If the
transmitter is installed inclined with respect to the vertical, the filling liquid exerts hydrostatic
pressure on the measuring diaphragm, resulting in a zero shift. In such an event, the zero point
Figure 2 FT3351 Dimensional Drawings
M11
1/4NPT
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can be corrected via the Local Operator Interface. It is important to mount the transmitter and
to lay the process piping so that gas bubbles, when measuring liquids, or condensate when
measuring gases, will flow back to the process and not enter the transmitter measuring
chamber. Different mounting brackets are available shown in Figure 4, Figure 5 and Figure 6.
For more information, see the Appendix.
Figure 4 Differential Pressure transmitter mounting diagrams
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2.3.3 Housing rotation
To improve field access to the wiring or the visibility of the optional LCD meter, the transmitter
housing may be rotated through 360° and fixed in any position (see Figure 7). A stop prevents
the housing from being turned too far.In order to proceed with housing rotation, the housing
stop tang-screw has to be unscrewed by approximately 1 rotation (do not pull it out) and, once
the desired position has been reached, retightened.
Figure 7 Housing rotation
2.4 Electrical considerations
Make sure all electrical installation is in accordance with national and local code requirements.
2.4.1 Conduit installation
If all connections are not sealed, excess moisture accumulation can damage the transmitter.
Make sure to mount the transmitter with the electrical housing positioned downward for
drainage. To avoid moisture accumulation in the housing, install wiring with a drip loop, and
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ensure the bottom of the drip loop is mounted lower than the conduit connections or the
transmitter housing based on Figure 8.
Figure 8 Recommended conduit connections
2.4.2 Wiring
Do not connect the power signal wiring to the test terminals. Voltage may burn out the reverse-
polarity protection diode in the test connection. Perform the following steps to make wiring
connections:
1. Remove the housing cover on terminal compartment side. Do not remove the cover in
explosive atmospheres when the circuit is live. Signal wiring supplies all power to the transmitter.
2. For 4-20 mA HART output, connect the positive lead to the terminal marked (+) and the
negative lead to the terminal marked (-). Do not connect powered signal wiring to the test
terminals. Power could damage the test diode.
3. Plug and seal unused conduit connection on the transmitter housing to avoid moisture
accumulation in the terminal side. Install wiring with a drip loop. Arrange the drip loop so the
bottom is lower than the conduit connections and the transmitter housing.
Transmitter operates on 14 - 30 Vdc (14-29.4 Vdc for satisfaction of EX). The dc power supply
should provide power with less than two percent ripple. The recommended wiring for transmitter
was shown in Figure 9.
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Figure 9 Recommended wiring
2.4.3 Grounding
Use the following techniques to properly ground the transmitter signal wiring and case. Do not
run signal wiring in conduit or open trays with power wiring or near heavy electrical equipment.
It is important that the instrument cable shield be:
◆trimmed close and insulated from touching the transmitter housing
◆Connected to the next shield if cable is routed through a junction box
◆Connected to a good earth ground at the power supply end.
For 4-20 mA HART output, the signal wiring may be grounded at any one point on the signal loop
or may be left ungrounded. The negative terminal of the power supply is a recommended
grounding point. Always ground the transmitter case in accordance with national and local
electrical codes. The most effective transmitter case grounding method is a direct connection to
earth ground with minimal impedance. Methods for grounding the transmitter case include:
◆Internal Ground Connection: The Internal Ground Connection screw is inside the FIELD
TERMINALS side of the electronics housing. This screw is identified by a ground symbol.
◆External Ground Connection: Grounding the transmitter case via threaded conduit
connection is the second way that may not provide sufficient ground continuity.
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3. Configuration
3.1 LCD display
The LCD indicator connects directly to the interface board which maintains direct access to the
signal terminals. It can display the digital pressure, temperature, current some kinds of physicals,
calculated variables such as level, volume, mass, density and flow, 0-100% analog indication and
abbreviated diagnostic messages. A display cover is provided to accommodate the display. The
LCD display features a three-line display. The first line displays three characters related to
measured parameter. The first character of the first line is <P> related to programing mode .
The second character of first line is <SP> related to set point indication if transmitter be used as
controller .The last character is <FIX>. This character is on when the output current of transmitter
forced to fixed value via hart device or due to use of transmitter in multi-drop mode. The second
line displays the actual measured value of pressure and its sign. The third line displays the
engineering unit for indicated variable. A speed meter located in above section of the first line
displayed the percentage of measured pressure. The LCD display is shown in Figure 10.
3.2 Device setup
For configuration and tuning the parameters, three key buttons exist on the indicator. The key
button characterized by <M> is located in above of LCD display and two key buttons located in
the bottom of LCD which characterized by <Z> and <S> signs.
In normal operation LCD shows the desired variable and/or percent range of output signal. In this
mode you can use <M> key to access menu list. In normal operation mode if you press and hold
the <Z> key between 3 to 10 seconds you can set the current value of applied pressure as low
range (LRV) of transmitter and if you press and hold the <S> key between 3 to 10 seconds you
can set the current value of applied pressure as high range (HRV) of transmitter.
Figure 10 LCD Display
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In operation mode by pressing <M> button, menu for tuning the parameters is available for users
and they can use this button to save new parameters when all characters in display are in blinking
mode. The key button characterized by <Z> is responsible for horizontal sweeping of parameters
and switching between programing mode and operation mode. Also, the key button
characterized by <S> is responsible for vertical sweeping of parameters.
Operation of this key button is mentioned in summery in table 3-1.
Table3-1 keys operation
Users can use the following instruction to perform the configuration of the different parameters
(see table 3-2).
3.2.1 Device Mode
According to application which a pressure transmitter is used, user should determine the type
of application and his desired variable as basic calculation.
The selectable application are as follow:
PRESS [Pressure measurement may be used in all applications]
LEVEL [level measurement may be used in tank application]
VOLUME [volume measurement may be used in tank application]
MASS [mass measurement may be used in tank application]
V-FLOW [volumetric flow measurement may be used in orifice application]
M-FLOW [mass flow measurement may be used in orifice application]
DENS [density measurement may be used in tank application]
3.2.2 Primary Variable
The primary variable is the most significant variable which in this device represents the actual
value of pressure measurement.
Configuration of primary variable is performed via following parameters:
3.2.2.1 Unit
User can select the unit of primary variable using this parameter.
parameter
display
Parameter tuning structure
Key button
operation
M
Accessing to menu list - saving new parameters –canceling the edited
parameter
Z
Horizontal sweeping of parameters - switching between programing mode
and operation mode - Applied pressure LRV setting
S
Vertical sweeping of parameters –Applied pressure HRV setting
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Unit
(set the unit of
pressure)
Press <M> until this page is appeared on LCD. Then press
<Z> to access the units (programing mode). You can select
the unit by pressing <S>. After that, press <Z> until all
characters blink. Then press <M> for the saving new
parameter and switching from programing mode to
operation mode.
The available units for pressure value are:
bar
mbar
inH2O [inch of water at 48ºC]
inMER [inch of Mercury at 0ºC]
mmH2O [millimeter of water at 48ºC]
cmH2O [centimeter of water at 4ºC]
mH2O [meter of water at 4ºC]
fH2O [feet of water at 68ºF]
cmMER [centimeter of mercury at 0ºC]
mmMER [millimeter of mercury at 0ºC]
mMER [meter of mercury at 0ºC]
PSI [pound per square inch]
PSF [pound per square foot]
G/CM2 [gram per square centimeter]
KG/M2 [kilogram per square meter]
Pa [Pascal]
KPa [kilopascal]
MPa [megapascal]
HPa [hectopascal]
ATM [Atmosphere]
TORR [torr]
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3.2.2.2 Max Range and Min Range and Transfer function
User can determine the maximum and minimum value of pressure which will be mapped to 4-
20mA of output signal. After this configuration the output signal will be mapped to min and max
values. So when the process pressure be equal to min-pressure, the output signal will be 4.0mA
and when it be equal to max-pressure, the output signal will be 20.0mA.
According to transfer function selected by user, for value between min and max pressure values,
the output signal will be produced with linear or square root curve.
parameter
display
Parameter tuning structure
Max-pressure
(The pressure
mapped to 20 mA)
Press <M> until this page is appeared on LCD. Then press
<Z> to access the amount of maximum pressure
(programing mode). You can change the amount of digits
by <S> and change the point and position of digits by <Z>.
After tuning this parameter, press the <Z> until all
characters blink. Then press <M> for the saving new
parameter and switching from programing mode to
operation mode.
Min-pressure
(The pressure
mapped to 4 mA)
Press <M> until this page is appeared on LCD. Then press
<Z> to access the amount of minimum pressure
(programing mode). You can change the amount of digits
by <S> and change the point and position of digits by <Z>.
After tuning this parameter, press the <Z> until all
characters blink. Then press <M> for the saving new
parameter and switching from programing mode to
operation mode.
Transfer
Function
(linear or SQRT
function)
Press <M> until this page is appeared on LCD. Then press
<Z> to access the primary variable transfer function
(programing mode). You can select linear or SQRT
function by pressing <S>. After that, press <Z> until all
characters blink. Then press <M> for the saving new
parameter and switching from programing mode to
operation mode
The unit of min and max pressure values is same as primary variable.
According to the pressure sensor range, the entered values should not be out of sensor range
and also user should consider the minimum span of device when determine the desired min and
max value, otherwise device will not accept the user changes. Ordinary, this type of
pressure transmitters supports 1/100 turn down ratio. So the difference between min and max
value should be greater than (Sensor Range)/100.
For more accurate configuration please refer to pressure transmitter datasheet.
3.2.2.3 Decimal point
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User can select the decimal points count of primary variable to display on LCD with DP menu. For
selecting the primary variable as displayed variable please refer to LCD parameters.
parameter
display
Parameter tuning structure
DP
(Decimal point for
show the primary
variable)
Press <M> until this page is appeared on LCD. Then press
<Z> to access the mapping mode (programing mode). You
can select the position of decimal point by pressing <S>.
After that, press <Z> until all characters blink. Then press
<M> for the saving new parameter and switching from
programing mode to operation mode.
If user select AUTO, according to momentary value of primary variable, the device determines
the number of decimal places.
3.2.2.4 Damping Value
User can determine the desired damping of primary variable and output signal using this
parameter. By setting of this parameter when the process pressure changes suddenly, the
primary variable and output signal will be change smoothly and will be reach to the changed
value after set damping value with a linear curve.
parameter
display
Parameter tuning structure
Damping
( for smoothing the
noisy output (based
on sec))
Press <M> until this page is appeared on LCD. Then press
<Z> to access the amount of time based on second
(programing mode). You can change the amount of digits
by <S> and change the point and position of digits by <Z>.
After tuning this parameter, press the <Z> until all
characters blink. Then press <M> for the saving new
parameter and switching from programing mode to
operation mode.
The unit of damping value is second and the specified value cannot be negative or greater than
60 seconds.
3.2.2.5 Low Trimming
User can perform low-trim of device with local panel. Often, low-trim is used for offset calibration
of device which may be for removing of media temperature effect on pressure transmitter or
transmitter installation type.
parameter
display
Parameter tuning structure
Trim-low
( For offset
removing and local
calibration of
minimum pressure)
Press <M> until this page is appeared on LCD. Then press
<Z> to access the amount of pressure (programing
mode). You can change the amount of digits by <S> and
change the point and position of digits by <Z>. After
tuning this parameter, press the <Z> until all characters
blink. Then press <M> for the saving new parameter and
switching from programing mode to operation mode.
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The unit of low trim value is same as primary variable.
When this menu appears on LCD it show the current measurement of process pressure. So after
stabilizing of process pressure user should enter his desired pressure value (ordinary zero).
After calibration, the device should show the desire pressure which is specified by user.
3.2.3 Custom Variable
The custom variable is a mathematical variable which is related to primary variable with a linear
or square root equation. Ordinary this variable is used to represent scaled value on display
instead of the primary variable. For example in orifice applications you can use this variable to
show the flow of fluid while the transmitter sends the differential pressure of orifice to DCS.
Configuration of custom variable is performed via following parameters:
3.2.3.1 Max Range and Min Range and Transfer function
User can determine the maximum and minimum value of variable which will be mapped to
maximum and minimum of primary variable. After this configuration when the process pressure
be equal to min-pressure, the custom variable represents the minimum value and when it be
equal to max-pressure, the custom variable represents the maximum value.
According to transfer function selected by user, for value between min and max pressure values,
the custom variable value will be produced with linear or square root curve.
parameter
display
Parameter tuning structure
Custom Variable
Max-Range
(The value mapped
to 20 mA)
Press <M> until this page is appeared on LCD. Then press
<Z> to access the amount of maximum value (programing
mode). You can change the amount of digits by <S> and
change the point and position of digits by <Z>. After
tuning this parameter, press the <Z> until all characters
blink. Then press <M> for the saving new parameter and
switching from programing mode to operation mode.
Custom Variable
Min-Range
(The value mapped
to 4 mA)
Press <M> until this page is appeared on LCD. Then press
<Z> to access the amount of minimum value (programing
mode). You can change the amount of digits by <S> and
change the point and position of digits by <Z>. After
tuning this parameter, press the <Z> until all characters
blink. Then press <M> for the saving new parameter and
switching from programing mode to operation mode.
Custom Variable
Transfer
Function
(linear or SQRT
function)
Press <M> until this page is appeared on LCD. Then press
<Z> to access the custom variable transfer function
(programing mode). You can select linear or SQRT
function by pressing <S>. After that, press <Z> until all
characters blink. Then press <M> for the saving new
parameter and switching from programing mode to
operation mode
The unit of min and max values is arbitrary.
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3.2.3.2 Decimal point
User can select the decimal points count of custom variable to display on LCD with DP menu. For
selecting the custom variable as displayed variable please refer to LCD parameters.
parameter
display
Parameter tuning structure
Custom Variable
DP
(Decimal point for
show the custom
variable)
Press <M> until this page is appeared on LCD. Then press
<Z> to access the mapping mode (programing mode). You
can select the position of decimal point by pressing <S>.
After that, press <Z> until all characters blink. Then press
<M> for the saving new parameter and switching from
programing mode to operation mode.
If user select AUTO, according to momentary value of custom variable, the device determines the
number of decimal places.
3.2.4 LCD Parameters
LCD is used to display the selected variable of pressure transmitter, the current value of output
signal, diagnostic signs like SQRT, FIX, Locked, Over-range and Under-range signs and also
implementation of configuration menu list.
User can select one or two variable to display on LCD in idle mode. If user select more than one
variable to show, LCD will display selected variables alternately.
parameter
display
Parameter tuning structure
LCD Mode
(configuring LCD to
show your desire
variable(s) and/or
range)
Press <M> until this page is appeared on LCD. Then press
<Z> to access the LCD configuration parameter
(programing mode). You can configure the LCD to show
primary variable (PV), the percent of output range (R),
custom variable (CV), sensor module temperature (SV),
level (L), volume (V), mass (M), density (D) and some
combinations of above by pressing <S>. After that, press
<Z> until all characters blink. Then press <M> for the
saving new parameter and switching from programing
mode to operation mode.
User can configure the LCD to display following variables and some combinations of them:
PV [primary variable (pressure)]
R [the percent of output range]
CV [custom variable]
SV [secondary variable (internal temperature of pressure sensor module)]
L [level in tank application]
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V [volume in tank application]
M [mass in tank application]
D [density in tank application]
3.2.5 Analog Output Parameters
The output signal of transmitter is a 4-20mA current which in normal condition represents the
current value of primary variable. If the value of primary variable be out of range or the device
conclude that there is a fault in electronic boards or sensor module that takes the device into
mal-function mode, the output signal will represent the alarm condition.
User can simulate and/or trim the output signal using CUR and CTR menu items.
parameter
display
Parameter tuning structure
Alarm
(setting alarm for
over range, under
range or holding the
last value)
Press <M> until this page is appeared on LCD. Then press
<Z> to access the Alarm parameters (programing mode).
You can set the alarm for over range (high) and under
range (low) or maintain the last value (Last) by pressing
<S>. After that, press <Z> until all characters blink. Then
press <M> for the saving new parameter and switching
from programing mode to operation mode.
Test/Trim
Current
(Simulate the
output current to fix
value and/or trim
the current)
Press <M> until this page is appeared on LCD. Then press
<Z> to access the test current value (programing mode).
You can change the amount of digits by <S> and change
the point and position of digits by <Z>. After tuning this
parameter, press the <Z> until all characters blink. Then
press <M> for apply this value to as output current. By
pressing <M> display module go to trimming mode. You
can enter the actual value which you read via series multi-
meter and press <M> key to save new parameter and
switching from programing mode to operation mode.
In any state to exit from simulating current mode you can
enter zero value as test current value or restart the
transmitter.
Communication Parameters
FT3351 Series transmitter supports Hart multi-drop mode. To identify the device ID in this
mode, user can use the POLL ID menu.
Table of contents
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