Alphasense - Model H2S-D4 -Hydrogen Sulfide Gas Sensors

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Sensitivity nA/ppm 20ppm H2 S 110 to 170. Response time t90 (s) from zero to 20ppm H2 S < 25. Zero current ppm equivalent in zero air < ±1. Resolution RMS noise (ppm equivalent) < 0.2. Range ppm H2. S limit of performance warranty 100. Linearity ppm error at full scale, linear at zero and 20ppm H2 S < ±6. Overgas limit maximum ppm for stable response to gas pulse 200.

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laboratory air testing

hydrogen gas sensor

LIFETIME

Zero drift ppm equivalent change/year in lab air < 0.2
Sensitivity drift % change/year in lab air, monthly test < 3
Operating life months until 80% original signal (24 month warranted) > 18

ENVIRONMENTAL

Sensitivity @ -20°C % (output @ -20°C/output @ 20°C) @ 20ppm 75 to 90
Sensitivity @ 50°C % (output @ 50°C/output @ 20°C) @ 20ppm 103 to 112
Zero @ -20°C ppm equivalent change from20°C < -0.3 to 0.2
Zero @ 50°C ppm equivalent change from 20°C < ±1

CROSS sensitivity

NO2 Sensitivity % measured gas @ 10ppm NO2 < -25
Cl2 sensitivity % measured gas @ 10ppm Cl2 < -25
NO sensitivity % measured gas @ 50ppm NO < 12
SO2 sensitivity % measured gas @ 20ppm SO2 < 20
CO sensitivity % measured gas @ 400ppm CO < 2.5
H2 sensitivity % measured gas @ 400ppm H2 < 0.5
C2H4 sensitivity % measured gas @ 400ppm C2H4 < 0.15
NH3 sensitivity % measured gas @ 20ppm NH3 < 0.1

KEY SPECIFICATIONS

Temperature range °C -30 to 50
Pressure range kPa 80 to 120
Humidity range %rh (see note below) 15 to 90
Storage period months @ 3 to 20°C (stored in sealed pot) 6
Load resistor ? (recommended) 10 to 47
Weight g < 2