HBM FS63 series User manual

Installation Guide
English
FS63
Weldable Temperature Sensor

Hottinger Baldwin Messtechnik GmbH
Im Tiefen See 45
D-64239 Darmstadt
Tel. [phone]
Fax [phone]
[email protected]
www.hbm.com
HBM FiberSensing, S.A.
Optical Business
Rua Vasconcelos Costa, 277
4470-640 Maia
Portugal
Tel. [phone]
Fax [phone]
[email protected]
www.hbm.com/fs
Mat.: 7-2002.4262
DVS: A4262-3.2 HBM: public
05.2015
Sensor Desing Version: v1.0
EHottinger Baldwin Messtechnik GmbH.
Subject to modifications.
All product descriptions are for general information only.
They are not to be understood as a guarantee of quality or
durability.

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English
1 Technical Details 4.........................................
1.1 General Information 4........................................
1.1.1 Overview 4.................................................
1.1.2 Characteristics 4.............................................
1.1.3 Applications 5...............................................
1.1.4 Quality 6...................................................
1.1.5 Accessories 6...............................................
1.2 General Specifications 7......................................
2 Sensor Installation 8........................................
2.1 List of Materials 8............................................
2.2 Spot Welding Machine 8......................................
2.3 Preparing the Surface 11......................................
2.4 Welding the Sensor 12........................................
2.5 Protecting the Sensor 13.......................................
2.5.1 Moisture Protection 13.........................................
2.5.2 Mechanical Protection 15......................................
3 Sensor Configuration 16.....................................
3.1 Sensor Calibration Sheet 16....................................
3.1.1 General Information 17........................................
3.1.2 Calibration Data 17...........................................
3.1.3 Temperature Computation 17..................................

Technical Details
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1 Technical Details
1.1 General Information
This installation guide applies to the following products:
Part Number Description
K-FS63-20-11-202 FS63 – Weldable Temperature Sensor • Indoor • FC/APC
K-FS63-20-13-202 FS63 – Weldable Temperature Sensor • Indoor • SC/APC
K-FS63-20-10-202 FS63 – Weldable Temperature Sensor • Indoor • NC
K-FS63-20-11-302 FS63 – Weldable Temperature Sensor • Outdoor • FC/APC
K-FS63-20-13-302 FS63 – Weldable Temperature Sensor • Outdoor • SC/APC
K-FS63-20-10-302 FS63 – Weldable Temperature Sensor • Outdoor • NC
1.1.1 Overview
The FS63 - Weldable Temperature Sensors are Fiber
Bragg Grating (FBG) based sensors, designed to be spot
welded to structures and components.
1.1.2 Characteristics
: Robustness
Long-term reliability ensured by innovative sensor design
and careful selection of materials.
: Completely passive
Inherent immunity to all electromagnetic effects (EMI,
RFI, sparks, etc.) and safe operation in hazardous envi
ronments.

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: High multiplexing capability
Connection of a large number of sensors to a single opti
cal fiber, reducing network and installation complexity.
: Remote sensing
Large distance between sensors and interrogator (sev
eral kilometers).
: Compatible with most interrogators
Provided with calibration sheet, allowing easy and accu
rate configuration.
: Self-referenced
Based on the measurement of an absolute parameter -
the Bragg wavelength - independent of power fluctua
tions.
1.1.3 Applications
HBM FiberSensing temperature sensors can be used in
several temperature measuring applications. They are
particularly suited for temperature mapping in large struc
tures (SHM).
: Industry
: Civil Engineering
: Energy
: R&D

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1.1.4 Quality
All HBM FiberSensing's processes are strictly controlled
from development to production. Each product is sub
jected to high standard performance and endurance
tests, individually calibrated and checked before ship
ping.
HBM FiberSensing, S.A. concentrates all optical sensing
activity of HBM and is an ISO 9001:2008 certified com
pany.
1.1.5 Accessories
The implementation of complex sensing networks in large
structures is made simpler with HBM FiberSensing
accessories. These include cables especially designed to
resist harsh environments as in civil engineering, not only
during construction, but also during the lifetime of the
structure (humidity, corrosion, etc.).
For the installation of weldable temperature sensors in
severe environments, an optional metallic protection
cover is available.

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1.2 General Specifications
Sensor
Sensitivity1) 10 pm/ºC
Measurement range -20 to 80 ºC
Resolution2) 0.1 ºC
Maximum calib. error 0.5 ºC
Optical
Central wavelength 1500 to 1600 nm
Spectral width (FWHM) < 0.2 nm
Reflectivity > 65%
Side lobe suppression > 10 dB
Inputs / Outputs
Cable type Ø 3 mm indoor (kevlar)
Ø 3 mm outdoor (armor)
Cable length 2 m each side (±5 cm)
Connectors FC/APC
SC/APC
NC (No Connectors)
Environmental
Operation temperature -20 to 80 ºC
Mechanical
Materials Stainless steel
Dimensions 45 x 15 x 0.6 mm
Weight 5 g
1) Typical values
2) For 1 pm resolution in wavelength measurement

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2 Sensor Installation
2.1 List of Materials
Included Material
Weldable Temperature Sensor
List of Needed Equipment
Spot welding Machine
List of Needed Material
Tape Drafting Tape
2.2 Spot Welding Machine
HBM FiberSensing uses a machine from Portable
Welders Ltd. Our console is the B3 (http://www.
portablewelders.com/technical-data-poke-consoles.html)
and the Poke Welding Gun is the PG2 (http://www.
portablewelders.com/poke-welding-guns-details.html).
The following instructions are based on our welding
machine and should be considered as an indication,
since ideal settings may differ from situation to situation
(machine, material, thickness, welding ground clamp
position, etc.).
The spot welding machine is composed by a console,
one ground gramp (Fig. 2.1) and one welding gun
(Fig. 2.2).

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Fig. 2.1
Fig. 2.2
Typical settings are shown in Fig. 2.3 below. This is a
starting point that should be adjusted to optimize the shot
and the welding.

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Fig. 2.3
Refer to section 2.4 on page 12 for welding process
instructions.

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2.3 Preparing the Surface
Deburr the surface until reaching a weldable material
while ensuring that there are no irregularities on the
surface. Clean the surface with a tissue to remove any
dust.
Fig. 2.4

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2.4 Welding the Sensor
Take the sensor out of its box taking care not to touch
the back side of the metal part.
Align the sensor on the surface and fix it with a small
piece of drafting tape across the edge of the assembly
and at the buffer.
Fig. 2.5
Give the first set of shots with the welding machine
(points 1 to 1') as shown in Fig. 2.6.
Fig. 2.6

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Fig. 2.7
Proceed with the second sets of shots as shown in
Fig. 2.7.
To ensure a complete strain isolation form the sensor,
only one half of the sensor should be welded.
2.5 Protecting the Sensor
For the weldable temperature sensor it is advisable to
further protect the sensor. The following instructions are
only suggestions of procedure.
2.5.1 Moisture Protection
To protect the sensor from direct moisture contact, HBM
FiberSensing uses a synthetic air tight rubber
(Polyisobutylene rubber).

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Cut a piece of rubber tape with approximately 70x23 mm.
Fig. 2.8
Remove the protection sheet from the tape and carefully
place it over the sensor. Press the tape towards the sen
sor and the surface.
Fig. 2.9

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2.5.2 Mechanical Protection
HBM FiberSensing has a sensor cover that can be used
with weldable temperature sensor. Weld the cover to the
surface.
Fig. 2.10

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3 Sensor Configuration
3.1 Sensor Calibration Sheet
Every HBM FiberSensing sensor is provided with a cali
bration sheet. The layout of this document is the same
for all temperature sensors.
Fig. 3.1

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3.1.1 General Information
Number 1in Fig. 3.1 shows the general information on
the particular sensor, such as its type, the sensor part
number, its serial number and the production tracking
number, the FBG ID.
3.1.2 Calibration Data
Under the calibration data table (number 2in Fig. 3.1)
there is the most important information on the strain sen
sor: its central wavelength at room temperature and its
sensitivity – values that should be used for temperature
computation.
3.1.3 Temperature Computation
Number 3in Fig. 3.1 exemplifies the calculations that
should be performed for wavelength measurement to
temperature conversion. The temperature variation of a
weldable temperature sensor is given by a second order
polynomial equation obtained by the sensor calibration.
temperature +S2x2)S1x)S0
Fig. 3.2
Where
SS0is the zero order sensitivity (reference tempera
ture) in ºC
SS1is the first order sensitivity in ºC/nm
SS2is the second order sensitivity in ºC/nm2

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And
Sx is the wavelength shift in nm computed as:
x+WL *CWL
Fig. 3.3
Where
SCWL is the central wavelength of the sensor at the
zero moment in nm
SWL is the measured wavelength in nm.
Number 4in Fig. 3.1 represents collected data during the
calibration procedure on the temperature sensors.

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