EDT-01 Electronic Diffusion Tube Electrochemical Gas Sensor

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[Shenzhen ISweek Technology LTD]

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Alphasense now provides a solution to some old problems:

 

· Palmes-type diffusion tubes are commonly used for indicative measurement of nitrogen dioxide (NO2) in cities for Local Air Quality Management. But sampling over several weeks gives only one average concentration for the entire sampling period and the result is reported weeks after the measurement.
· Odours which were previously ignored by local industry and city councils are now headline problems. There is a growing requirement to monitor odour plumes around landfills, waste water treatment plants, agricultural/ poultry farms and industrial sites- but the cost of the necessary network of monitoring nodes is prohibitive. Hydrogen sulfide (H2S) or ammonia (NH3) are the two mot commonly measured gases for odour detection.

Alphasense introduces the Electronic Diffusion Tube (EDT): a single gas data logger with ppb resolution using the proven Alphasense A4 family of electrochemical ppb gas sensors.

Electronic Diffusion Tube EDT-01 Schematic Diagram

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Electronic Diffusion Tube EDT-01 Features include:
• The low cost EDT makes networks affordable
• User- adjustable logging interval from one minute to four hours
• Also records relative humidity and ambient temperature
• Eight months battery life from two Lithium AA cells
• Data is downloaded in seconds via Bluetooth to the Android smart phone app
• Designed for waterproof to IP 67
• Mounting bracket connects easily to both walls and poles
• Gases include NO2 , NO2 +O3 , H2S, NH3 and CO. Sensor data sheets specify performance. 
Data analysis support available

Electronic Diffusion Tube EDT-01 SPECIFICATION

Range
ppm (NO2)
0-5
ppm (H2S)
0-50
ppm (CO)
0-500
ppm (NH3)
0-100
Temperature range
°C
-20 to +50
Humidity range
%rh
10 to 90 continuous
Temp. accuracy
-20 to +50°C
±0.5°C
Sampling time
min
1 to 256
Data storage capacity
stored readings
44,000
Power (battery)
2 x LiSOCl 14500 (AA)
8 months continuous use
V supply
V
3.75 (nominal)
Communication
low power Bluetooth
5- 10 m range for downloading
EDT dimensions
mm
25 dia x 170
EDT weight
g
<150
Mounting Bracket dims
mm
60 x 250
Mounting Bracket weight
g


Electronic Diffusion Tube EDT-01 Applications include:
· Co-locating with Palmes-type diffusion tubes to record diurnal and weekly patterns and peaks
· Monitoring urban construction sites for compliance, especially for peak concentrations
· Ring-fencing odour sources for plume monitoring- daily downloads provide regular feedback
· Tracking ammonia plumes on poultry farms
· Detecting fugitive emissions from industrial sites for both leak detection and ensuring compliance

· Low cost educational tool when teaching about air quality




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