HBM FS63 series User manual

Installation Guide
English
FS63
Embedded 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.: 7-2002.4261
DVS: A4261-3.2 HBM: public
05.2015
Sensor Design 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 Preparing the Structure 8.....................................
2.3 Placing the Sensor 12.........................................
2.4 Concreting 15................................................
3 Sensor Configuration 17.....................................
3.1 Sensor Calibration Sheet 17....................................
3.1.1 General Information 18........................................
3.1.2 Calibration Data 18...........................................
3.1.3 Temperature Computation 18..................................

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-FS63-50-11-302 FS63 – Embedded Temperature Sensor • Outdoor • FC/APC
K-FS63-50-13-302 FS63 – Embedded Temperature Sensor • Outdoor • SC/APC
K-FS63-50-10-302 FS63 – Embedded Temperature Sensor • Outdoor • NC
1.1.1 Overview
The FS63 - Embedded Temperature Sensors are Fiber
Bragg Grating (FBG) based sensors, designed to be
directly cast into concrete wet mix.
1.1.2 Characteristics
: Robustness
Long-term reliability ensured by innovative sensor
design, careful selection of materials and IP68 packag
ing.
: 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 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
Protection class IP68
Mechanical
Materials Stainless steel
Dimensions 100 x Ø 10 mm
Weight 55 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
Embedded Temperature Sensor
List of Needed Material
Clumps Plastic wire clumps
Tube Flexible and resistant protection tube
Box Protection box to be embedded (optional)
Labels Colored tape/ shrinking tube/ …
Protection Silicone or foam
2.2 Preparing the Structure
The embedded temperature sensor is a sensor prepared
to be embedded in concrete. Its design includes
ruggedized cables that resist such an environment.
Nevertheless, whenever possible, further protection of
cables should be performed on the cables path.
Prepare the sensor cables path with an appropriate, flexi
ble and resistant tube.

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Fig. 2.1
Fig. 2.2
Depending on the control on the construction site, HBM
FiberSensing suggests two different solutions regarding
the access to the sensor connections:
If the stripping of the concrete can be closely controlled,
the protection tube can pass directly through a hole in the
formwork (Fig. 2.3 and Fig. 2.4). Later, when the form
work is removed, a box can be placed over the exit of the

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cables so that connections can be conveniently pro
tected.
Fig. 2.3
Fig. 2.4
If the stripping cannot be controlled, it is advisable to use
embedded protection boxes. Fix the box to the formwork
with screws that can be later on removed before the
stripping.

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Fig. 2.5
Fig. 2.6
Important
Make sure the construction workers are instructed that it
is necessary to disconnect the boxes from the formwork
before removing it.

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2.3 Placing the Sensor
Carefully take the sensor out of the box.
Place it on the structure with the desired orientation. Fix
the buffer as close to the sensor as possible making sure
that the interface of the sensor and the buffer is not being
forced.
Fig. 2.7
Fig. 2.8

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If there is more than one sensor protected by the same
tube it is advisable to mark the end of the buffer so that
the sensors can be identified later on. Use, for example,
colored tape or heat shrinkable tube (Fig. 2.8). Be
extremely careful with the heat application on the shrink
able tube for the buffer is sensible to high temperatures.
Control the path of the buffers with plastic wire clamps
ensuring that the exposed buffers (before entering the
protection tube) do not have tight curves and that it is
protected by the reinforcement during the concreting
operations and vibration (Fig. 2.9).
Fig. 2.9

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Fig. 2.10
Close the end of the protection tube with polyurethane
foam, silicone or similar (Fig. 2.10).

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2.4 Concreting
Fig. 2.11
Fig. 2.12
The concreting process is a tough operation on the sen
sors, specially the vibration of the concrete.
One way of protecting the sensors from the vibrating
equipment, as well as from the heavier aggregates, is to
place a net on top of the sensors location.

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Important
Despite all the protections you may have planned, make
sure the operations are closely supervised and inform the
workers about the installed sensors.

Sensor Configuration
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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 an
embedded temperature sensor is given by a second
order polynomial equation obtained by the sensor calibra
tion.
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 temperature sensors.

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