Zabezpieczenia:
o-olejowe
p-nadciśnieniowe
q-piaskowe
d-szczelne
e-zwiększonego bezp.
I-samoistnie bezpieczne
Grupy wybuchowości:
I- metan, IIa, IIb IIc
Max. temp. pow.
T1 – 450°C
T2 – 300 °C
T3 –200 °C
T4 – 135 °C
T5 –100 °C
T6 - 80 °C
A
A
Prawo Daltona
1 pound per square inch = 6 894.75729 pascals
Solid-State Chemical Sensors
• Metal-oxide semiconductor layer
– Usually tin dioxide (SnO2)
• Apply heat
– In air
• Surface oxygen increases (negatively charged)
• Resistance increases
– In presence of deoxidizing gas
• Surface oxygen decreases
• Resistance decreases
Figaro Engineering, Inc.
• Chemical gas sensors
–
–
–
–
–
–
–
LP-Gas/Propane (500-10000ppm)
Natural gas/Methane (500-10000ppm)
General combustible gas (500-10000ppm)
Hydrogen (50-1000ppm)
Carbon monoxide (50-1000ppm)
Ammonia (30-300ppm)
Hydrogen sulfide (5-100ppm)
How They Work
Półprzewodnikowy czujnik CO
z SnO2, Firgaro 2442
Półprzewodnikowy czujnik CO
z SnO2, Firgaro 2442
TGS 2442 Basic Measuring Circuit
• 1 second heating cycle
• 1 second circuit voltage cycle
Figaro TGS 2442
• Features:
– Low power consumption
– High sensitivity/selectivity
to carbon monoxide (CO)
– Miniature size
– Low sensitivity to alcohol
vapor
– Long life and low cost
– Low humidity dependency
TGS 2442 Specifications
Figaro TGS 2442
• Carbon Monoxide Sensor
• Applications:
– CO detectors
– Air quality controllers
– Indoor parking lot ventilation
• Gas sensing layer
– Tin dioxide (SnO2)
Półprzewodnikowy czujnik
metanu z SnO2, Firgaro 2611
Podwójny czujnik
metanu i CO,
Figaro 3870
VH
0,9V
0,2V
Czujnik podwójny na gazy
wydechowe: NO2, H2, CO
MicroChemical Systems SA
• Chemical gas sensors
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–
–
–
–
Ozone (0.01-10ppm)
Nitrogen Dioxide (0.05-5ppm)
Ethanol (50-1000ppm)
CO / NO2 (1-400ppm/0.05-5ppm)
Carbon Monoxide & HCs (1-400ppm)
MicroChemical Systems MiCS-3110
• Ethanol Sensor
• Applications:
– Breathalizer: (Blood Alcohol Content)
– Various industrial applications
• Gas sensing layer
– Tin dioxide (SnO2)
MicroChemical Systems MiCS-3110
• Features:
–
–
–
–
–
Low heater current
Wide detection range
High sensitivity
Fast thermal response
Electro-Static Discharge
protected
– Miniature dimensions
– High resistance to shocks
and vibrations
MiCS-3110 Basic Measuring Circuit
• Run in constant voltage mode
• Heater voltage of VH = 2.4 V
– increases temperature of Rs to 430°C
MiCS-3110 Specifications
SnO2 for Ethanol Sensing
• RS = Sensor resistance to C2H5OH
• R10ppm = Sensor resistance resistance in 10 ppm of C2H5OH
Chemical Sensor Arrays
• Array of polymer composite sensors
• Swell in presence of vaporized analyte
– Conductive polymer pathways broken
– Resistance increases
• Different gases produce different responses
Cyrano Sciences, Inc. Cyranose® 320
• Hand-held chemical vapor sensor
• 32 thin-film carbon-black
chemiresistors
• Trained by taking different
measurements
– Create a database of patterns
– Match odors against saved patterns
Cyranose® 320 Specifications
Cyrano Sciences, Inc.
TM
NoseChip
• Under development
– Low cost, low power, lightweight sensing
– Optional short-range wireless capability
• Applications
– Sensing nodes for facilities protection
– Personal badge detectors for toxic
industrial chemicals and chemical warfare
agents
– Residual life indication
– Leak detectors in military or commercial
systems
– Quality monitors in embedded systems
TM
NoseChip
Specifications
Elektrolityczny czujnik
CO2 z elektrolitem
stałym Figaro 4160
Elektrolityczny czujnik O2 (450 zł) żywotność 5 do 10 lat
Czujniki oparte na pochłanianiu promieniowania podczerwonego
CO, CO2,
CH4 NO2
Edinburgh Instruments GasCard II
pomiar steżenia CO2 zakresy od 0-500 ppm do 0-5000ppm
Niepewność 2-6% niestabilność jednoroczna 2-6%
w zależności od zakresu
Czujniki oparte na pochłanianiu promieniowania podczerwonego
DESCRIPTION
The SensorChip CO2 sensor is a highly integrated
single
component IR device containing all elements of an
NDIR
optical bench on a single MEMS chip. This miniature
device generates narrowband infrared radiation tuned to
CO2, eliminating the need for optical filters. The emitter
provides tuned output with 85% of the blackbody
power at the CO2 wavelength and suppresses emission
at other bands for high CO2 selectivity and power
efficiency. This is achieved through ICx Photonics’
patented PCE (photonic crystal enhanced) emitter
technology.
Bibliography
• Figaro Engineering, Inc.
– http://www.figarosensor.com/
• MicroChemical Systems SA
– http://www.microchemical.com/
– http://www.sensors.com.cn/download/MiCS/
• Cyrano Sciences, Inc.
– http://cyranosciences.com/
SnO2 for CO Sensing
• Rs = Sensor resistance of displayed gases
• Ro = Sensor resistance in 100ppm CO
SnO2 for CO Sensing
• Rs = Sensor resistance at 30ppm, 100ppm and 300ppm
of CO at various temperatures and 50%R.H.
• Ro = Sensor resistance at 300ppm of CO at 25°C and 50% R.H.
Wilgotność
Wilgotność
Czujniki pojemnościowe
Czujniki rezystancyjne
Wilgotność
Czujniki termiczne do pomiaru wilgotności bezwzględnej
Czujniki punktu rosy