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Hydrogen Sulfide Sensor (H2S Sensor) 4-Electrode - H2S-A4

? Range: 50 ppm H2S limit of performance warranty
? Sensitivity: 1400 to 1850? nA/ppm at 2ppm H2S
? Response time t90: < 45s from zero to 2ppm H2S
? Temperature range: -30 to 50 ℃
? Pressure range: 80 to 120 kPa
? Humidity range: 15 to 90 % rh
? Weight: < 6? g

Model Number: H2S-A4
Data Sheet:

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Product Specification

H2S-A4 Hydrogen Sulfide Sensor (H2S Sensor) Description
Alphasense Hydrogen Sulfide gas sensors operate using well-known fuel cell technology.

H2S-A4 Hydrogen Sulfide Sensor size:
20mm diameter, the industry standard size for portable gas detectors

With very high sensitivity and low zero, accurate and stable readings are possible when measuring current concentration ranges from ppb to 1% H2S.

H2S-A4 Hydrogen Sulfide Sensor (H2S Sensor) PERFORMANCE
Sensitivity	nA/ppm at 2ppm H2S	1400 to 1850
Response time	t90 (s) from zero to 2ppm H2S	< 45
Zero current	nA in zero air at 20°C	-250 to 100
Noise*	±2 standard deviations (ppb equivalent)	5
Range	ppm H2S limit of performance warranty	50
Linearity	ppb error at full scale, linear at zero and 10ppm H2S	< ± 0.5
Overgas limit	maximum ppm for stable response to gas pulse	100
* Tested with Alphasense AFE low noise circuit

H2S-A4 Hydrogen Sulfide Sensor (H2S Sensor) LIFETIME
Zero drift	ppb equivalent change/year in lab air	< ±100
Sensitivity drift	% change/year in lab air, monthly test	< 20
Operating life	months until 50% original signal (24 month warranted)	24

H2S-A4 Hydrogen Sulfide Sensor (H2S Sensor) ENVIRONMENTAL
Sensitivity @ -20°C	(% output @ -20°C/output @ 20°C) @ 2ppm H2S	80 to 92
Sensitivity @ 50°C	(% output @ 50°C/output @ 20°C) @ 2ppm H2S	100 to 110
Zero @ -20°C	nA change from 20°C	30 to 50
Zero @ 50°C	nA change from 20°C	90 to 110

H2S-A4 Hydrogen Sulfide Sensor (H2S Sensor) CROSS SENSITIVITY
NO2 sensitivity	% measured gas @ 5ppm NO2	< -20
Cl2 sensitivity	% measured gas @ 5ppm Cl2	< -8
NO sensitivity	% measured gas @ 5ppm NO	< 3
SO2 sensitivity	% measured gas @ 5ppm SO2	< 15
CO sensitivity	% measured gas @ 5ppm CO	< 1
H2 sensitivity	% measured gas @ 100ppm H2	< 0.5
C2H4 sensitivity	% measured gas @ 100ppm C2H4	< 0.5
NH3 sensitivity	% measured gas @ 5ppm NH3	< 0.1
CO2 sensitivity	% measured gas @ 5% CO2	< 0.1

H2S-A4 Hydrogen Sulfide Sensor (H2S 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℃ (stored in sealed pot)	6
Load resistor	Ω (AFE circuit is recommended)	33 to 100
Weight	g	< 6

Matched Transmitter board for H2S-A4 H2S Sensor

Analogue Front End (AFE) Alphasense A4 Air Quality Sensors
The family of Analogue Front End (AFE) circuits are designed for use with the A4 air quality sensors. Connect the AFE with A4 sensors to your multtiplexed ADC and you are recording air quality data immediately.