DTSX Distributed Temperature Sensor

Distributed Temperature Sensor
- Capabilities
Hans Meulman
Business Development Manager
Optical Fiber Sensing Solutions
Yokogawa Europe
DTS Basics
Backscattered
Introduction DTS technology
The fiber optic Distributed Temperature Sensing (DTS)
method using the Raman-effect has been developed
at Southampton University in England, UK in the early
80’s.
The DTS method is based on Optical Time-Domain
Reflectometer (OTDR) technology and uses a
technique derived from telecommunication cable
testing.
The fiber optic-based DTS method measures
temperature using optical fiber instead of
thermocouples or thermistors
Distributed Temperature Sensor (DTS)
Principle
Distributed Measurement - 1m spatial resolution
Measurement of 50 km
Measurement
–
Optical fiber = 50,000 sensors!
Backscattered light provides temperature at every 1m
Standard multi-mode optical fiber
T1
DTS Instrument
(interrogator)
T2
T3
T4 ……….
Distributed Temperature Sensor (DTS)
Principle
Light is backscattered from natural anomalies within
the fiber
This happens at all points within the fiber
Range gating allows specific sections along the fiber’s
length to be examined
Spectrum
laser pulse
Backscattered light
laser
detection
Scattered light spectrum
Raman
Anti-Stokes
Temperature dependent
Frequency shift
Raman
Stokes
Optical fiber
DTS Measurement Principle
Principle
Spectrum
© annotation by SensorTran
DTS Applications
Applications: Downhole Applications
Temperature Monitor
(Steam Chest formation,
Breakthrough)
Borehole
Flow Monitor (Joule-Thomson Effect)
(Oil or Gas Flow at each Zone)
Heel
Steam
Oil
Applications: LNG
LNG Terminals
Gas Tank
LNG Tank
Vaporizer
Governor
LNG Tanker
Offloading Pipe
Initial Cool Down Monitoring and
Leak Detection
 Reducing Start Up time
 Preventing Gas Leak
Pipe Leak Detection
 Preventing Gas Leak
Bottom of Tank
Temperature Monitoring
 Preventing Ground Freezing
Applications: LNG Tank leak detection
DTS can identify small leakage
Inner Tank
Optical Fiber Cable
Outer Tank
Detecting the leakage
10
Applications: Monitoring power lines
Monitoring of power transmission line temperature
To check abnormal hot-spot (ground fault, insulation breakdown
etc.)
To predict temperature of conductor from cable temperature
and current.
Overheating of cable’s maximum operating temperature
Applications: Pipeline Leak Detection
Quick detection of small leakage events and monitoring of the
pipeline temperature profile.
Pipelines such as LNG, LPG, ammonia, ethylene create cold zones
which can be easily detected when leaks occur.
Applications: Hot Spot Monitoring
Customer benefits
No Blank Area: Only one optic fiber can monitor temperature for wide area
Prompt Action: Heated Location Detection in short time (<10sec/Channel)
Full overview: With the optical fibre you can monitor a big area. Give
warning what avoid damage on the installation
Applications: Fire detection in Conveyor systems
Application
Detection of heat build-up/fire along industrial conveyor systems prior to
fire outbreak (woodchips)
DTS detects abnormal temperature at every point of the conveyer.
1
2
Belts
2’
3
Rollers
3’
4
Optical Sensor Cables
Applications: Fire Detection for Cable rack system
Application
Detection of heat build-up/fire in cable tray or rack system
Customer benefits
No Dead spot: Only one optic fiber can monitor temperature along the
cables.
Monitoring Wide Area: Multi Channel Monitoring by using Optical Switch
Prompt Action: Heated Location Detection in short time (<10sec/Ch.)
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Applications ……..
Much more:
– Industrial Facilities
– Tunnels
– Structures & Buildings
– Environments Monitoring
– Dams
– Dykes, Waterways and Harbours
Fiber optical cable
Advantage of the Optical Fiber Cable
Fiber Cable
The sensor
Immunity to electromagnetic interference (EMI) and electrical discharge
(lightning)
Passive operation, intrinsically safe.
Water and corrosion resistant
Excellent resolution and range
Rugged, small size and light weight
Absolute measurement
Low signal loss, sensors may be interrogated for many kilometres
Signal conditioning equipment has much smaller foot print
DTSX Unit
DTSX Modules
DTSX Performance
Performance
Specifications
Spatial Resolution: 1m
Sampling Interval: 10cm, 20cm, 50cm, 1m
Temperature resolution: 0.2 ℃ (3km, 10min) (DTSX200)
Temperature resolution: 0.03℃ (10Km , 10min ) (DTSX3000)
Non-Volatile on-board Memory data storgae (100 traces)
Low Power Consumpotion (full operating Range)
Operation 10W, Standy-by 2W (DTSX200)
Operation 16W, Standy-by 2W (DTSX3000)
DTSX Lineup
Compact
Industrial Design
19 inch compact rack design
Industrial design -40 to +65°C (2 & 4 ch)
Humidity 20-80% RH. Non-condensing
Low weight and footprint (weight 2,5 kg)
Approvals
Compliance
ATEX Type ”n”
CSA Type ”n”
FM : Class I, Div 2, Gps A, B, C, D T4
CSA : Class I, Div 2, Gps A, B, C, D T4
DTSX Modular design
Alarm Management
Integrated
High, Low, Rise, Fall & Difference
Alarm Section
Full Alarm management Module inside
30 alarm section to define
Combination of differed alarm types
Alarms available in Process environment
Fully Integrated in DTSX
Integrate Programmable Logic Controller
Openness
Integrated PLC
STARDOM PLC: Programmable Logic Controller
–
–
–
–
Control with programmable logic
Simple or Sequential Process
Interface with DTSX (Tempurature data & alarm data)
Embedded I/O
Temperature Info
Pressure, flow, temperature relay, buttons indicators….
Conclusion
Advantage of DTS
When there are a large number of sensors to be placed
A single optical fiber can replace many point sensors
When there is no a priori knowledge of sensor placement
Not always possible to determine the correct location/position
for temperature sensor
When electrical temperature monitoring is impractical
Situation where there is a large amount of electromagnetic noise
When electrical temperature monitoring is unsafe
fiber optic does not present a spark hazard can be a significant
safety advantage.
Advantage of DTS
DTS systems represent a cost-effective method for
obtaining thousands of accurate, high-resolution temperature
measurements.
DTS technology offers a safe and non-intrusive
measurement with has the capability to pinpoint the
precise location of any warm or cold spot instantly.
Thank you for your attention