FT Technologies FT702LT User manual

1FT702LT Flat Front Wind Sensor Manual
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A4206-4-EN
JULY 2017
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FT702LT Wind Sensor Manual
Digital (RS485) - Flat Front Variant

2FT702LT Flat Front Wind Sensor Manual
Contents
Product Symbols....................................................................................................... 3
1INTRODUCTION.................................................................................................. 6
1.1 Product Overview .............................................................................................................6
1.2 Build Versions and Labelling...........................................................................................6
1.3 Pipe Mount Sensor ...........................................................................................................7
1.4 Scope of Use.....................................................................................................................7
1.5 Disclaimer .........................................................................................................................8
2FUNCTIONAL DESCRIPTION ............................................................................ 9
2.1 Technical Performance.....................................................................................................9
2.2 Wind Speed Calibration..................................................................................................10
2.3 Wind Speed and Direction Filtering...............................................................................10
2.4 Electronic Rotation of the Datum Direction ..................................................................11
2.5 Error Detection................................................................................................................11
2.6 Heater Setup....................................................................................................................11
3INSTALLATION................................................................................................. 12
3.1 Connectivity ....................................................................................................................12
3.2 Description of Parts........................................................................................................14
3.3 Lightning protection and EMC.......................................................................................16
3.4 Inspection of the FT702LT..............................................................................................21
3.5 Fault Finding & Troubleshooting...................................................................................22
3.6 Returns............................................................................................................................22
4EVALUATION.................................................................................................... 23
4.1 Evaluation Pack ..............................................................................................................23
4.2 Acu-Vis Software ............................................................................................................23
4.3 FT054 Evaluation Cable..................................................................................................24
4.4 Quick Start Steps............................................................................................................24
5SENSOR COMMUNICATION............................................................................ 26
5.1 Introduction.....................................................................................................................26
5.2 Configuring the FT702LT................................................................................................26
5.3 Communication...............................................................................................................26
6PARAMETER SETTINGS.................................................................................. 30
6.1 Command Types.............................................................................................................30
6.2 User Calibration Table....................................................................................................32
6.3 Timing Constraints .........................................................................................................33
6.4 Command Parameters....................................................................................................34

3FT702LT Flat Front Wind Sensor Manual
Product Symbols
The following symbols are used upon the product and throughout the manual.
Meaning / Description
Symbol
Signification / Description
Warning/ Caution
An appropriate safety instruction should be
followed or caution to a potential hazard
exists
Avertissement / Attention
Une instruction de sécurité doit être
suivie ou attention portée à un
danger potentiel qui existe.
DC Current only
Equipment operates under Direct Current
(DC) supply only.
Courant continu uniquement
L'équipement fonctionne sous une
alimentation en courant continu (CC)
uniquement.
Product Disposal
In accordance with European directive
2012/19/EU on Waste Electrical and
Electronic Equipment (WEEE), these
product components must be recycled. This
should be done by returning the product to
FT Technologies or by using an appropriate
waste disposal company. This product
should not be disposed of in general waste
or landfill.
Élimination du produit
Conformément à la directive
européenne 2012/19/EU relative aux
déchets d'équipements électriques et
électroniques (DEEE), ces
composants du produit doivent être
recyclés. Cela doit être fait par le
retour du produit à FT Technologies
ou en utilisant une entreprise
d'élimination de déchets. Ce produit
ne doit pas être éliminé avec les
ordures ménagères ou en décharge.
Recognized Component
Sensors marked with the ETL label indicate
that the product conforms to UL Standard
61010-1 and is certified to CSA Standard
C22.2 No. 61010-1.
4000105
Composant Reconnu
Les capteurs marqués avec
l’étiquette ETL indiquent que le
produit est conforme à la norme UL
61010-01 et est certifié à la norme
CSA22.2 61010-01.
CE Mark
The EU Declaration of Conformity complies
with the essential requirements of the
following applicable EMC Directive
2014/30/EU, and carries the CE Marking
accordingly.
Marquage CE
Déclaration de conformité CE de la
compatibilité électromagnétique
(EMC) et marquage CE
conformément à la directive CE
2014/30/EU.

4FT702LT Flat Front Wind Sensor Manual
Safety Instructions - English
To ensure the safe installation and operation of this product the equipment must be installed and
integrated:
oUsing suitably qualified and trained personnel
oIn accordance with any regional electrical codes
oIn accordance with the instructions set out in this manual, observing all information, warnings
and instructions
oIn accordance with any other instructions or guidance FT Technologies provide
To ensure that the product remains compliant with the electrical safety requirements of the UL / CSA
61010-1 standards, the equipment must be:
oConnected to an appropriately approved isolated power supply (for example UL/CSA IEC
60950-1:2005 + A1:2009 + A2:2013) rated 20-30VDC and be current limited (6A Max)
oProtected by UL 1449 listed surge protective devices
oConnected with an approved interface cable (for example UL/ CSA recognised AWM style
21198, rated 300V, 80°C)
The equipment must only be operated within the range of the specified technical data and used for the
purposes for which it was designed.
The equipment should always be transported in packaging which is appropriate, that will prevent any
accidental damage from occurring.
Always ensure that any failures or errors from the product cannot cause any damage to any other
equipment or property or cause any other consequential effects.

5FT702LT Flat Front Wind Sensor Manual
Consignes de sécurité –Français
Pour assurer la sécurité de l'installation et le fonctionnement de ce produit, l'équipement doit être
installé et intégré :
oÀ l'aide de personnel qualifié et formé
oConformément à tous les codes électriques régionaux
oConformément aux instructions figurant dans ce manuel et en observant toutes les
informations, avertissements et instructions
oConformément à d'autres instructions ou directives que FT Technologies fournit
Pour garantir que le produit reste compatible avec les exigences de sécurité électrique de l'UL/CSA
61010-1 normes, l'équipement doit être :
oConnecté à une alimentation agréée convenablement isolée (par exemple UL/CSA IEC 60950-
1:2005 + A1:2009 + A2:2013) de tension nominale 20-30 VCC et avec courant limité (6 A max)
oProtégé par des dispositifs de protection UL 1449 contre les surtensions
oConnecté avec un câble d'interface (par exemple UL/CSA reconnu AWM style 21198, de
valeur nominale 300 V, 80°C)
L'équipement doit être utilisé uniquement dans la plage des données techniques spécifiées et utilisé
aux fins pour lesquelles il a été conçu.
L'équipement doit toujours être transporté dans un emballage qui est approprié, qui permettra d'éviter
qu'un quelconque dommage accidentel ne survienne.
En toutes circonstances, garantir que les défaillances ou les erreurs du produit ne puissent pas causer
des dommages à d'autres équipements ou autres biens ou provoquer d'autres effets indirects.

Section 1 Introduction
6FT702LT Flat Front Wind Sensor Manual
1 INTRODUCTION
1.1 Product Overview
The FT702LT is a solid-state ultrasonic wind sensor which uses a patented Acoustic Resonance
airflow sensing technique to measure accurately both wind speed and direction. The FT702LT has
been specifically designed to operate in harsh environments such as offshore and lightning and ice-
prone areas. The wind sensor has no moving parts to degrade or wear-out and is designed for
applications requiring high reliability. The FT702LT helps reduce costly down-time and unscheduled
maintenance visits.
Mounting and aligning the sensor is very straightforward. The mounting flat on the sensor body
defines the 0°wind datum so that the sensor automatically aligns to a reference point. For operation in
ice-prone areas the FT702LT is fitted with a highly effective thermostatically controlled ‘all-body’
heating system. A three element heater (one element located in the top of the sensor and two in the
bottom) is used to ensure that heat is evenly distributed over the entire surface area.
Figure 1: FT702LT Flat Front Wind Sensor#
#actual sensor shape varies between build versions
Maximum Sensor
Dimensions
h (mm)
w (mm)
Before build version 22
167
50
Build versions 22 and after
161
55
1.2 Build Versions and Labelling
Each time a substantial revision is made to the design of the wind sensor the build version number is
incremented. All new variants are backwards compatible with the previous build versions. Each uses
the same mounting, connector pin outs and signal characteristics and contains all the original functions.
Where a new function has been introduced the first build version to have it included is stated.

Section 1 Introduction
7FT702LT Flat Front Wind Sensor Manual
Figure 2 shows how to identify an FT702LT’s build version and individual serial number, depending on
which main label is attached.
Serial Number
Build version
Product Labels*
*Additional labels may also be attached
Figure 2: Examples of Main Sensor Labels
Only sensors marked with the Intertek label conform to UL 61010-1 and are certified to CAN/CSAC22.2
No. 61010-1-04. Some early build versions do not have this certification.
1.3 Pipe Mount Sensor
It is possible to mount the wind sensor directly on top of a pipe. Details of the Pipe Mount sensor and
system can be found in a separate manual. The Pipe Mount sensor offers enhanced environmental
sealing, lightning protection, thermal conductivity and corrosion resistance. The base of the Pipe Mount
sensor is different to the Flat Front sensors described in this manual. Please contact FT Technologies
for further information.
1.4 Scope of Use
The FT702LT is designed, manufactured and optimised for high availability. The FT702LT wind sensor
often attains 99.9% or better availability of wind speed and wind direction readings.
No promise in part or full can be given to guarantee an FT702LT wind sensor’s continuous operation,
as exceptional circumstances can occur that may result in the failure of the output from a sensor.
Exceptional circumstances can include:
Poor installation
Inadequate inspection
Power supply failures
Poor quality electrical connections
Lightning exposure
Problematic environmental conditions or combination of conditions
Typically higher levels of wind speed and wind direction data availability are achieved through the use
of an additional FT sensor or an additional mechanical or ultrasonic sensor. Control strategies or
algorithms, which compensate in whole or in part, for any temporary interruption of data from individual
sensors should also be applied. The choice and implementation of such methods is entirely the
Purchaser’s responsibility.

Section 1 Introduction
8FT702LT Flat Front Wind Sensor Manual
1.5 Disclaimer
There are no warranties, representations or conditions, expressed or implied of any kind given in this
manual for any particular design application. The Purchaser should independently undertake sufficient
testing to confirm validity and suitability of any design. The Purchaser assumes all risks and liability in
conjunction with the use of the information given.
Any warranty given by FT Technologies in respect of the Equipment is conditional upon the sensor
being handled, installed, integrated and operated in accordance within the guidelines given in this
manual.
FT Technologies can take no responsibility for the effectiveness of any sensor lightning protection
scheme implemented. The wind sensor has passed a wide range of EMC tests but FT Technologies
does not warrant the sensor to survive direct lightning strikes.
Information supplied by FT Technologies Ltd. shall not be construed as permission to license to operate
under, or recommendation to infringe any existing or pending patent, patent applications or trademarks.

Section 2 Functional Description
9FT702LT Flat Front Wind Sensor Manual
2 FUNCTIONAL DESCRIPTION
2.1 Technical Performance
Sensor Performance1
Measurement Principle Acoustic Resonance (compensated against variations in temperature,
pressure and humidity)
Wind speed Measurement
Range 0-50m/s
Accuracy 0.5m/s (0-15m/s), 4% (>15m/s)
Resolution 0.1m/s
Wind Direction Measurement
Range 0 to 360
Accuracy 2(within 10of 0datum), 4(beyond ±10⁰of 0⁰datum)
Resolution 1
Environment
Temperature Range -40to +85C (operating), -40to +85C (storage)
Humidity 0-100%
Data I/O
RS485 Option
Interface Digital RS485, galvanically isolated from power supply lines and
case
Format ASCII data, polled or continuous output modes
Data Update Rate 5 measurements per second
Power Requirements3
Supply Voltage 20V to 30V DC (24V DC nominal)
Supply Current (Heater off) 30mA
Supply Current (Heater on) 6A (max)* –The heater is thermostatically controlled. Heater power
consumption will depend on the heater energy required to keep the sensor’s
temperature at a user determined set point. The heater and sensor power
consumption is limited by default to 99W2.
*Only 4A (max) power consumption possible for sensors prior to build
version 22.
Physical
Weight 320g (max)
Material Aluminium alloy, hard anodised
I/O Connector 5 way (RS485 option),
Mounting Method Self aligning, single screw fixing
Notes:
1.All specifications subject to change without notice
2.The heater set point, current limit and maximum power limits can be configured by programming the
sensor’s internal parameter settings (only available from Version 22 and above)
3.See safety instruction requirements (page 4)

Section 2 Functional Description
10 FT702LT Flat Front Wind Sensor Manual
2.2 Wind Speed Calibration
All FT702LT wind sensors are built and then calibrated in the same wind tunnel before dispatch. There is no
need to recalibrate a sensor over its lifetime as the sensor has no moving parts and so no measurement
degradation will occur. The sensor’s compact strong monolithic shape is designed to prevent accidental
transducer movement or damage. FT Technologies’calibration procedure and wind tunnel are designed to give
a calibration profile that is within the accuracy limits set in the product technical specification (see section 2.1).
Every 3 months the accuracy of FT’s wind tunnel is compared with the accuracy of an independent wind tunnel
to ensure that no drift has occurred.
However, in exceptional circumstances users may wish to apply additional calibration factors. Version 22 sensors
and above therefore have an option to set a User Calibration Table, which can modify the wind sensor’s wind
speed output (see section 6.4.19).
The User Calibration Table can be programmed with up to 64 correction factors which are maintained in non-
volatile memory. When enabled, the uncorrected wind speed output is adjusted according to the stored User
Calibration Table records using linear interpolation. The adjustments are applied to wind speed readings
regardless of wind direction.
2.3 Wind Speed and Direction Filtering
It is important that the system does not rely exclusively on a single wind reading for any control decision. A
single reading may be inaccurate due to measurement error, turbulence, corruption or interference. It is
recommended that an average of wind readings is used. In addition if 100% data availability is required then a
second FT sensor or wind sensor should be fitted.
The FT702LT has optional internal filtering available. This is a digital finite impulse response (FIR) filter, which
works by calculating the moving average of a fixed number of previous readings. If filtering is being applied
externally, the sensor’s output filters can be disabled. If filtering inside the sensor is preferred, the length of the
averaging for both wind speed and direction can be independently set (See Sections 6.4.8 & 6.4.9).
First Reading Second Reading
Third Reading
Forth Reading -1 -2 -3 -4 -5 -6 -7 -8
Previous Readings
0.0 0.2 0.4 0.6-0.2-0.4-0.6-0.8-1.0-1.2-1.4-1.6
Time (s)
= Sum of 8 Readings /8
= Sum of 8 Readings /8
= Sum of 8 Readings / 8
First Reading Second Reading
Third Reading
Forth Reading -1 -2 -3 -4 -5
Previous Readings
0.0 0.2 0.4 0.6-0.2-0.4-0.6-0.8-1.0
Time (s)
= Sum of 4 Readings /4
= Sum of 4 Readings / 4
= Sum of 4 Readings /4
Filter length 0008 Filter length 0004
Figure 3: Examples of FIR Filtering
Always use an average of several readings for any calculations or control decisions because
single readings can accidentally become corrupted.