Post on 14-Jan-2016
Environment Protection System INC.Environment Protection System INC.
GAS DETECTION SENSORGAS DETECTION SENSOR
CATALYTIC SENSORCATALYTIC SENSOR
Catalytic Bead Catalytic Bead 觸媒觸媒珠珠
Wheatstone Bridge Wheatstone Bridge
No Temperature or No Temperature or Humidity Effect Humidity Effect
Silicone Resistant Silicone Resistant
0-100% L.E.L. Scale0-100% L.E.L. Scale
Catalyzed
Passivated Bead
Wheatstone Bridge Wheatstone Bridge
DC Supply
Output
Detector
Compensator
ElectrochemicalElectrochemical
Current Generating Electrolytic Current Generating Electrolytic Reaction Reaction
Specificity to Gas of Interest Specificity to Gas of Interest
PPM for Toxics or Percent PPM for Toxics or Percent Volume for OxygenVolume for Oxygen
Sensing-electrode2CO + 2H2O 2CO2 + 4H+ + 4e-
Counter-electrodeO2 + 4H+ + 4e 2H2O
Cell reaction2CO + O2 2CO2
Sensing-electrode2CO + 2H2O 2CO2 + 4H+ + 4e-
Counter-electrodeO2 + 4H+ + 4e 2H2O
Cell reaction2CO + O2 2CO2
隔膜電池式Membrane Type Galvanic Cell Method
隔膜電池式Membrane Type Galvanic Cell Method
mVmV
陽極陽極電解液電解液
陰極陰極
隔膜隔膜
信號端子信號端子
21 50 10021 50 100
20 10
20 10
感應器信號
感應器信號
(mV)(mV)
氧氣濃度 (%O2)氧氣濃度 (%O2)
陰極 陰極 (( 貴金屬貴金屬 )) O2+2H2O + 4e- 40H- O2+2H2O + 4e- 40H-
陽極 陽極 (( 鉛鉛 )) 2Pb 2Pb 2Pb2 + 4e-2Pb2 + 4e-
Sensing: CO + H2O CO2 + 2H+ + 2e-Counter: ½O2 + 2H+ + 2e- H2OAnd the overall reaction is: CO + ½O2 CO2
Sensing: CO + H2O CO2 + 2H+ + 2e-Counter: ½O2 + 2H+ + 2e- H2OAnd the overall reaction is: CO + ½O2 CO2
SPECTROGRAMSPECTROGRAM
InfraredInfrared
Methane or Propane Methane or Propane
Carbon Dioxide Carbon Dioxide
Accurate Accurate
Large Measurement Large Measurement Range Range
Low MaintenanceLow Maintenance
SampleSample Cell
DetectorDetector SourceSource
Light Absorption sensors are becoming more affordable and more reliable. Light Absorption sensors are becoming more affordable and more reliable. They are used for optically absorbing gases that fall in the infrared (IR), They are used for optically absorbing gases that fall in the infrared (IR), visible, or ultraviolet (UV) spectral ranges. Some gases reliably detected visible, or ultraviolet (UV) spectral ranges. Some gases reliably detected by optical sensors are: carbon dioxide, methanol, hydrogen cyanide, by optical sensors are: carbon dioxide, methanol, hydrogen cyanide, chlorine, refrigerant gases and naphthalene. chlorine, refrigerant gases and naphthalene.
SEMICONDUCTOR SENSOR
SEMICONDUCTOR SENSOR
SENSOR ARRAYSENSOR ARRAY
High-Temperature Gas Sensor ArrayHigh-Temperature Gas Sensor Array
SENSOR ARRAY
APPLICATION
SENSOR ARRAY
APPLICATION
Methanol Concentration SensorMethanol Concentration Sensor
Integrated Sensing Systems, Inc. (ISSYS) in Ypsilanti, Michigan, announced the small methanol concentration sensors under development, targeting the active Direct Methanol Fuel Cell (DMFC) market. These small sensors can also be utilized in a variety of other industrial and analytical applications for the need of a low-cost, accurate, small, inline density or chemical concentration sensors
Integrated Sensing Systems, Inc. (ISSYS) in Ypsilanti, Michigan, announced the small methanol concentration sensors under development, targeting the active Direct Methanol Fuel Cell (DMFC) market. These small sensors can also be utilized in a variety of other industrial and analytical applications for the need of a low-cost, accurate, small, inline density or chemical concentration sensors
( 化學式 CH3OH)( 化學式 CH3OH)