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AlphaSense COH-A2 Dual Gas Sensor

AlphaSense COH-A2 Dual Gas Sensor
Regular price $159.00 USD

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The AlphaSense COH-A2 2sense Dual Gas Sensor detects both carbon monoxide and hydrogen sulfide in a single sensor. It is designed for OEM manufactures who need to measure both gases as well as a replacement sensor for several models of personal gas safety monitors.

Features

  • Low Cross-Sensitivity
  • No external power required
  • Proven and tested design

This 20mm diameter, 4-pin sensor is the industry standard size for portable gas detectors.

The 2sense does not compromise performance or long term stability over the standard two-sensor solution when measuring both H2S and CO.

Specifications - Carbon Monoxide

  • Sensitivity: nA/ppm in 400ppm CO 50 to 100
  • Response time: tgo (s) from zero to 400ppm CO < 35
  • Zero current: ppm equivalent in zero air -3 to +3.5
  • Resolution: rms noise (ppm equivalent) < 0.5
  • Range: ppm CO limit of performance warranty 1,000
  • Linearity: ppm error at full scale, linear at zero and 400 ppm CO 10 to 40
  • Overgas limit: maximum CO for stable response to gas pulse 5,000
  • Zero drift: ppm equivalent change/year in lab air < 0.5
  • Sensitivity drift: % change/year in lab air, monthly test < 4
  • Operating life: months until 80% original signal (24 month warranted) 24
  • Sensitivity@ -20°C % (output@ -20°C/output@ 20°C) @ 1 00ppm CO 30 to 50
  • Sensitivity@ 50°C % (output@ 50°C/output@ 20°c)@ 100ppm CO 120 to 145
  • Zero@ -20°C ppm equivalent change from 20°c 0 to 5
  • Zero@ 50°C ppm equivalent change from 20°c 30 to 50 120 to 145 0 to -5
  • Temperature range °C: -30 to 50
  • Pressure range kPa: 80 to 120
  • Humidity range %RH continuous 15 to 90
  • Storage period months: @ 3 to 20°c (stored in sealed pot) 6
  • Load resistor: olms (recommended) 10 to 47
  • Weight grams: < 6
CROSS SENSITIVITY
  • Filter Capacity: ppm-hours of Hydrogen Sulfide 1200
  • H2S sensitivity % measured gas@ 20ppm H2S  < 12
  • H2 sensitivity % measured gas@ 400ppm H2@ 20°C < 8
  • NO2 sensitivity % measured gas@ 10ppm NO2 <3
  • Cl2 sensitivity % measured gas@ 10ppm Cl2 < 0.1
  • NO sensitivity % measured gas@ 50ppm NO < 100
  • SO2 sensitivity % measured gas@ 20ppm SO2 <2
  • C2H4 sensitivity % measured gas@ 400ppm C2H4 < 60
  • NH3 sensitivity % measured gas@ 20ppm NH3  < 6

Specifications - Hydrogen Sulfide

  • Sensitivity: nA/ppm in 20ppm H2S 450 to 1000
  • Response time: tgo (s) from zero to 20ppm H2S@ 20°c < 30
  • Zero current: ppm equivalent in zero air ± 0.25
  • Resolution: rms noise (ppm equivalent) < 0.1
  • Range: ppm H2S limit of performance warranty 100
  • Linearity: ppm error at full scale, linear at zero and 20ppm H2S <± 5
  • Overgas limit: maximum ppm H2S for stable response to gas pulse 200
  • Lifetime Zero drift: ppm equivalent change/year in lab air < 0.1
  • Lifetime Sensitivity drift: % change/year in lab air, monthly test < 2
  • Operating life: months until 80% original signal (24 month warranted) 24
  • Sensitivity@ -20°C % (output@ -20°C/output@ 20°C)@ 20ppm H2S 75 to 90
  • Sensitivity@ 50°C % (output@ 50°C/output@ 20°c) @ 20ppm H2s 100 to 112
  • Zero @ -20°C ppm equivalent change from 20°c ±0.05
  • Zero @ 50°C ppm equivalent change from 20°c <Oto 0.2
Cross Sensitivity
  • NO2 sensitivity: % measured gas@ 10ppm NO2 < -30
  • Cl2 sensitivity % measured gas@ 10ppm Cl2 < -25
  • NO sensitivity % measured gas@ 50ppm NO < 30
  • S02 sensitivity % measured gas@ 20ppm SO2 < 30
  • CO sensitivity % measured gas@ 400ppm CO < 1.5
  • H2 sensitivity % measured gas@ 400ppm H2 < 0.3
  • C2H4 sensitivity % measured gas@ 400ppm C2H4 < 0.2
  • NH3 sensitivity % measured gas@ 20ppm NH3 <2 

Warranty

  • 90 Days. See GasLab Terms and Conditions

Tube cap adapters easily convert 20mm standard gas sensors from diffusion to sampling sensors. Molded polymer grips sensor for easy fit and removal while maintaining a good seal.

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"Swift response and shipment. The product is easy to setup and use. It is just what I was looking for."

- Shima Tomohiro

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