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Sulfur Dioxide + Hydrogen Sulfide Sensor (SO2 + H2S Sensor) - SOH-A2

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• Range: 20ppm SO2 limit of performance warranty
• Range: 100ppm H2S limit of performance warranty
• Sensitivity: 140 to 250 nA/ppm in 10ppm SO2
• Sensitivity: 450 to 900 nA/ppm in 20ppm H2S
• Temperature range: -30 to 50 ℃
• Pressure range: 80 to 120 kPa
• Humidity range: 15 to 90 %rh continuous
• Weight: < 6 g

Model Number: SOH-A2
Data Sheet:

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Product Specification

SOH-A2 Sulfur Dioxide + Hydrogen Sulfide Sensor Introduction
Personal gas safety monitors can be found in almost every industry, with the requirement for multiple gas detection becoming commonplace.

Sulfur gases are toxic with a complex chemistry. Measuring both SO2 and H2S provides the information for separating the corrosive gases, but with different toxicologies.

2Sense Dual Gas
Save space and save cost with our 2Sense family of dual gas sensors, in the A-series 20mm size.
With a patented design and best response, these dual sensors offer the required performance with obvious advantages.

SO2 / H2S the SOH-A2 measures the two critical Sulfur gases together within one sensor body and using a software algorithm, separates the two gases for clear discrimination.

Sulfur Dioxide Sensor (SO2 Sensor) Specification

Sulfur Dioxide Sensor PERFORMANCE
Sensitivity	nA/ppm in 10ppm SO2	140 to 250
Response time	t90 (s) from zero to 10ppm SO2	< 15
Zero current	ppm equivalent in zero air	< ± 0.2
Resolution	rms noise (ppm equivalent)	< 0.2
Range	ppm SO2 limit of performance warranty	20
Linearity	ppm error at full scale, linear at zero and 10 ppm SO2	< ±2
Overgas limit	ppm maximum SO2 for stable response to gas pulse	50

Sulfur Dioxide Sensor LIFETIME
Zero drift	ppm equivalent change/year in lab air	< 0.5
Sensitivity drift	% change/year in lab air, monthly test	< 6
Operating life	months until 80% original signal (24 month warranted)	24

Sulfur Dioxide Sensor ENVIRONMENTAL
Sensitivity @ -20°C	% (output @ -20°C/output @ 20°C) @ 10ppm SO2	90 to 100
Sensitivity @ 50°C	% (output @ 50°C/output @ 20°C) @ 10ppm SO2	80 to 100
Zero @ -20°C	ppm equivalent change from 20°C	-0.2 to 0.2
Zero @ 50°C	ppm equivalent change from 20°C	0.2 to 0.8

Sulfur Dioxide Sensor CROSS SENSITIVITY
Filter capacity	ppm hours of Hydrogen Sulfide	nd
H2S sensitivity	% measured gas @ 20ppm H2S	< 15
NO2 sensitivity	% measured gas @ 10ppm NO2	< -150
Cl2 sensitivity	% measured gas @ 10ppm Cl2	< -50
NO sensitivity	% measured gas @ 50ppm NO	< 50
CO sensitivity	% measured gas @ 400ppm CO	< 1
H2 sensitivity	% measured gas @ 400ppm H2 @ 20°C	< 1
C2H4 sensitivity	% measured gas @ 400ppm C2H4	< 40
NH3 sensitivity	% measured gas @ 20ppm NH3	< 1

Sulfur Dioxide Sensor KEY SPECIFICATIONS
Temperature range	°C	-30 to 50
Pressure range	kPa	80 to 120
Humidity range	%rh continuous (see note below)	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

Hydrogen Sulfide Sensor (H2S Sensor) Specification

Hydrogen Sulfide Sensor PERFORMANCE
Sensitivity	nA/ppm in 20ppm H2S	450 to 900
Response time	t90 (s) from zero to 20ppm H2S @ 20℃	< 25
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

Hydrogen Sulfide Sensor LIFETIME
Zero drift	ppm equivalent change/year in lab air	< 0.1
Sensitivity drift	% change/year in lab air, monthly test	< 2
Operating life	months until 80% original signal ( 24 month warranted)	24

Hydrogen Sulfide Sensor ENVIRONMENTAL
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 110
Zero @ -20°C	ppm equivalent change from 20°C	±0.2
Zero @ 50°C	ppm equivalent change from 20°C	±0.2

Hydrogen Sulfide Sensor CROSS SENSITIVITY
Filter capacity	ppm.hrs of SO2	nd
NO2 sensitivity	% measured gas @ 10ppm NO2	< -25
Cl2 sensitivity	% measured gas @ 10ppm Cl2	< -20
NO sensitivity	% measured gas @ 50ppm NO	< 15
SO2 sensitivity	% measured gas @ 10ppm SO2	< 30
CO sensitivity	% measured gas @ 400ppm CO	< 1.5
H2 sensitivity	% measured gas @ 400ppm H2	< 0.2
C2H4 sensitivity	% measured gas @ 400ppm C2H4	< 0.2
NH3 sensitivity	% measured gas @ 20ppm NH3	< ±0.5