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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.

Micro-Pump Kit includes all the tools you need to urilize the tube-cap adapters as part of a sampling sensor system.

Nafion tubing is a highly selective, semi-permeable membrane to water vapor. If gases inside Nafion tubing are wetter than gases surrounding the tubing, drying will occur. If the surrounding gases are wetter, humidification will occur.

Micro gas sampling pumps provide a constant flow of air across the sensor with a tube cap - perfect for bench-top testing of sensors for closed-loop sampling applications.

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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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