Transcript Environment Protection System INC. GAS DETECTION SENSOR CATALYTIC SENSOR Catalytic Bead 觸媒珠 Wheatstone Bridge No Temperature or Humidity Effect Silicone Resistant 0-100% L.E.L.

Environment Protection System INC.
GAS DETECTION SENSOR
CATALYTIC SENSOR
Catalytic Bead 觸媒珠
Wheatstone Bridge
No Temperature or
Humidity Effect
Silicone Resistant
0-100% L.E.L. Scale
Catalyzed
Passivated
Bead
Wheatstone Bridge
Compensator
DC
Supply
Detector
Output
Electrochemical
Current Generating Electrolytic
Reaction
Specificity to Gas of Interest
PPM for Toxics or Percent
Volume for Oxygen
Sensing-electrode
2CO + 2H2O 2CO2 + 4H+ + 4eCounter-electrode
O2 + 4H+ + 4e 2H2O
Cell reaction
2CO + O2 2CO2
隔膜電池式
Membrane Type Galvanic Cell Method
隔膜
感
應
器
信
號
陰極
陽極
電解液
20
10
(mV)
21
50
mV
氧氣濃度 (%O2)
信號端子
陰極 (貴金屬)
O2+2H2O + 4e- 40H-
陽極 (鉛)
2Pb
2Pb2 + 4e-
100
Sensing: CO + H2O CO2 + 2H+ + 2eCounter: ½O2 + 2H+ + 2e- H2O
And the overall reaction is: CO + ½O2 CO2
SPECTROGRAM
Infrared
Sample Cell
Methane or Propane
Carbon Dioxide
Accurate
Large Measurement
Range
Detector
Source
Low Maintenance
Light Absorption sensors are becoming more affordable and more reliable.
They are used for optically absorbing gases that fall in the infrared (IR),
visible, or ultraviolet (UV) spectral ranges. Some gases reliably detected
by optical sensors are: carbon dioxide, methanol, hydrogen cyanide,
chlorine, refrigerant gases and naphthalene.
SEMICONDUCTOR
SENSOR
SENSOR ARRAY
High-Temperature
Gas Sensor Array
SENSOR
ARRAY
APPLICATION
Methanol Concentration Sensor
(化學式CH3OH)
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 lowcost, accurate, small, inline density
or chemical concentration sensors