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Help CenterSOH-A2 Sulfur Dioxide + Hydrogen Sulfide Sensor (SO2 + H2S Sensor)
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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
Zero current
ppm equivalent in zero air
Resolution
rms noise (ppm equivalent)
Range
ppm SO2 limit of performance warranty
20
Linearity
ppm error at full scale, linear at zero and 10 ppm SO2
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
Sensitivity drift
% change/year in lab air, monthly test
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
NO2 sensitivity
% measured gas @ 10ppm NO2
Cl2 sensitivity
% measured gas @ 10ppm Cl2
NO sensitivity
% measured gas @ 50ppm NO
CO sensitivity
% measured gas @ 400ppm CO
H2 sensitivity
% measured gas @ 400ppm H2 @ 20°C
C2H4 sensitivity
% measured gas @ 400ppm C2H4
NH3 sensitivity
% measured gas @ 20ppm NH3
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
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℃ |
|
| Zero current |
ppm equivalent in zero air |
± 0.25 |
| Resolution |
rms noise (ppm equivalent) |
|
| Range |
ppm H2S limit of performance warranty |
100 |
| Linearity |
ppm error at full scale, linear at zero and 20ppm H2S |
|
| 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 |
|
| Sensitivity drift |
% change/year in lab air, monthly test |
|
| 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 |
|
| Cl2 sensitivity |
% measured gas @ 10ppm Cl2 |
|
| NO sensitivity |
% measured gas @ 50ppm NO |
|
| SO2 sensitivity |
% measured gas @ 10ppm SO2 |
|
| CO sensitivity |
% measured gas @ 400ppm CO |
|
| H2 sensitivity |
% measured gas @ 400ppm H2 |
|
| C2H4 sensitivity |
% measured gas @ 400ppm C2H4 |
|
| NH3 sensitivity |
% measured gas @ 20ppm NH3 |
|
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