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Sulfur Dioxide Sensor (SO2 Sensor) - SO2-AF

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• Range: 50ppm limit of performance warranty
• Sensitivity: 300 to 550 nA/ppm in 10ppm SO2
• Response time t90: < 35 (s) from zero to 10ppm SO2
• Resolution: < 0.1 RMS noise (ppm equivalent)
• Operating life: > 24 months
• Temperature range: -30 to 50 °C
• Pressure range: 80 to 120 kPa
• Humidity range: 15 to 90 % rh continuous
• Weight: < 6g

Model Number: SO2-AF
Data Sheet:

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Product Specification

SO2-AF Sulfur Dioxide Sensor SO2 Sensor Description
Alphasense Sulfur Dioxide gas sensors operate using proven fuel cell technology.

SO2-AF Sulfur Dioxide Sensor size:
20mm diameter, the industry standard size for portable gas detectors

The SO2 range provides OEMs with reliable sensors for use in a variety of applications. Strong signal levels combined with low zero current allows resolution below 1ppm and an operating range for safety applications up to 2,000ppm. The sensors are designed for use in both fixed site and portable instrumentation.

The SO2 sensors offer our electrolyte leak-free guarantee and reliable long-term detection performance. The leakproof housing is moulded with a colour coded top for ease of identification.

SO2-AF Sulfur Dioxide Sensor SO2 Sensor Schematic Diagram

SO2-AF Sulfur Dioxide Sensor SO2 Sensor PERFORMANCE
Sensitivity	nA/ppm in 10ppm SO2	300 to 550
Response time	t90 (s) from zero to 10ppm SO2	< 35
Zero current	ppm equivalent in zero air	< ± 0.6
Resolution	RMS noise (ppm equivalent)	< 0.1
Range	ppm limit of performance warranty	50
Linearity	ppm error at full scale, linear at zero and 10ppm	< ± 0.3
Overgas limit	maximum ppm for stable response to gas pulse	75

SO2-AF Sulfur Dioxide Sensor SO2 Sensor LIFETIME
Zero drift	ppm equivalent change/year in lab air	<0.1
Sensitivity drift	% change/year in lab air, monthly test	< 4
Operating life	months until 80% original signal (24 month warranted)	> 24

SO2-AF Sulfur Dioxide Sensor SO2 Sensor ENVIRONMENTAL
Sensitivity @ -20°C	% (output @ -20°C/output @ 20°C) @ 10ppm	70 to 90
Sensitivity @ 50°C	% (output @ 50°C/output @ 20°C) @ 10ppm	90 to 102
Zero @ -20°C	ppm equivalent change from 20°C	< ± 0.8
Zero @ 50°C	ppm equivalent change from 20°C	< ± 3

SO2-AF Sulfur Dioxide Sensor SO2 Sensor CROSS SENSITIVITY
Filter capacity	ppm·hrs H2S	1000
H2S sensitivity	% measured gas @ 20ppm H2S	< 3
NO2 sensitivity	% measured gas @ 10ppm NO2	< -130
Cl2 sensitivity	% measured gas @ 10ppm Cl2	< -60
NO sensitivity	% measured gas @ 50ppm NO	< ± 2
CO sensitivity	% measured gas @ 400ppm CO	< 1.6
H2 sensitivity	% measured gas @ 400ppm H2	< 0.3
C2H4 sensitivity	% measured gas @ 400ppm C2H4	< 40
NH3 sensitivity	% measured gas @ 20ppm NH3	< 0.1

SO2-AF Sulfur Dioxide Sensor SO2 Sensor KEY SPECIFICATIONS
Temperature range	°C	-30 to 50
Pressure range	kPa	80 to 120
Humidity range	% rh continuous	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

Matched Transmitter board for SO2-AF SO2 Sensor

4-20mA Digital Transmitter Board
• Factory calibration, custom-set for immediate use
• Digital zero, sensitivity and temperature compensation
• Digital and 4-20mA output
• Biased or unbiased operation
• Calibration and range change

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