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Hydrogen Sensor (H2 Sensor) - H2-AF

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• Range: 2,000 ppm H2 limit of performance warranty
• Sensitivity: 10 to 25 nA/ppm in 400ppm H2
• Response time t90: < 45s from zero to 400ppm H2
• Resolution: < 0.7 RMS noise (ppm equivalent)
• Temperature range: -30 to 50°C
• Pressure range: 80 to 120 kPa
• Humidity range: 15 to 90 % rh
• Weight: < 6g

Model Number: H2-AF
Data Sheet:

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Product Specification

H2-AF Hydrogen Sensor H2 Sensor Description
Alphasense is expanding its line of electrochemical Toxic Gas Sensors to address industry-specific requirements, including emissions monitoring, process safety, environmental monitoring and VOCs.

Hydrogen (H2)
The Hydrogen sensor has excellent ppm sensitivity for low concentrations to 2,000ppm H2. The very low sensitivity to CO makes this one of the most selective Hydrogen sensors on the market.
As with all Hydrogen sensors, temperature compensation for sensitivity must be applied carefully.
Available in A series.

H2-AF Hydrogen Sensor H2 Sensor PERFORMANCE
Sensitivity	nA/ppm in 400ppm H2	10 to 25
Response time	t90 (s) from zero to 400ppm H2	< 45
Zero current	ppm equivalent in zero air	± 15
Resolution	RMS noise (ppm equivalent)	< 0.7
Range	ppm H2 limit of performance warranty	2,000
Linearity	ppm error at full scale, linear at zero and 400ppm H2	-200 to -500
Overgas limit	maximum ppm for stable response to gas pulse	5,000

H2-AF Hydrogen Sensor H2 Sensor LIFETIME
Zero drift	ppm equivalent change/year in lab air	< 20
Sensitivity drift	% change/year in lab air, monthly test	nd
Operating life	months until 80% original signal (24 month warranted)	> 24

H2-AF Hydrogen Sensor H2 Sensor ENVIRONMENTAL
Sensitivity @ -20°C	% (output @ -20°C/output @ 20°C) @ 500 ppm H2	10 to 25
Sensitivity @ 50°C	% (output @ 50°C/output @ 20°C) @ 500 ppm H2	220 to 275
Zero @ -20°C	ppm equivalent change from 20°C	± 2
Zero @ 50°C	ppm equivalent change from 20°C	0 to -4

H2-AF Hydrogen Sensor H2 Sensor CROSS SENSITIVITY
Filter capacity	ppm·hrs H2S	nd
CO sensitivity	% measured gas @ 400ppm CO	< 2
NO2 sensitivity	% measured gas @ 10ppm NO2	< 1
Cl2 sensitivity	% measured gas @ 10ppm Cl2	< 1
NO sensitivity	% measured gas @ 50ppm NO	< 40
SO2 sensitivity	% measured gas @ 20ppm SO2	< 4
H2S sensitivity	% measured gas @ 20ppm H2S	< 2
C2H4 sensitivity	% measured gas @ 400ppm C2H4	< 25
NH3 sensitivity	% measured gas @ 20ppm NH3	< 1
CO2 sensitivity	% measured gas @ 5% CO2	< 1

H2-AF Hydrogen Sensor H2 Sensor KEY SPECIFICATIONS
Temperature range	°C	-30 to 50
Pressure range	kPa	80 to 120
Humidity range	% rh	15 to 90
Storage period	months @ 3 to 20°C (stored in sealed pot)	6
Load resistor	Ω (recommended)	10 to 47
Weight	g	< 6