FAHM HART FT3351 Series Bedienungsanleitung
SMART Pressure Transmitter
FT3351 Series User Manual July.2022
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FAHM Co.
Industrial Automation
Doc. FT3351Rev1401-05
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
SMART Pressure Transmitter
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Doc. FT3351Rev1401-05
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
SMART Pressure Transmitter
FT3351 Series User Manual July.2022
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FAHM Co.
Industrial Automation
Doc. FT3351Rev1401-05
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) .
SMART Pressure Transmitter
FT3351 Series User Manual July.2022
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FAHM Co.
Industrial Automation
Doc. FT3351Rev1401-05
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
SMART Pressure Transmitter
FT3351 Series User Manual July.2022
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FAHM Co.
Industrial Automation
Doc. FT3351Rev1401-05
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
SMART Pressure Transmitter
FT3351 Series User Manual July.2022
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FAHM Co.
Industrial Automation
Doc. FT3351Rev1401-05
(–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
SMART Pressure Transmitter
FT3351 Series User Manual July.2022
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Doc. FT3351Rev1401-05
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
SMART Pressure Transmitter
FT3351 Series User Manual July.2022
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FAHM Co.
Industrial Automation
Doc. FT3351Rev1401-05
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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