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High Concentration Sulfur Dioxide Sensor (SO2 Sensor) - SO2-BE

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• Range: 2,000 ppm limit of performance warranty
• Sensitivity: 70 to 85 nA/ppm in 20ppm SO2
• Response time t90: < 30 (s) from zero to 20ppm SO2
• Resolution: < 2 RMS noise (ppm equivalent)
• Temperature range: -30 to 50°C
• Pressure range: 80 to 120 kPa
• Humidity range: 15 to 90 % rh continuous (see note below)
• Weight: < 13 g

Model Number: SO2-BE
Data Sheet:

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Product Specification

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

SO2-BE Sulfur Dioxide Sensor size:
32mm diameter package, the best choice for fixed site applications

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-BE Sulfur Dioxide Sensor SO2 Sensor PERFORMANCE
Sensitivity	nA/ppm in 20ppm SO2	70 to 85
Response time	t90 (s) from zero to 20ppm SO2	< 30
Zero current	ppm equivalent in zero air	< ±2
Resolution	RMS noise (ppm equivalent)	< 2
Range	ppm limit of performance warranty	2,000
Linearity	ppm error at full scale, linear at zero and 20ppm SO2	nd
Overgas limit	maximum ppm for stable response to gas pulse	10,000

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

SO2-BE Sulfur Dioxide Sensor SO2 Sensor ENVIRONMENTAL
Sensitivity @ -20°C	% (output @ -20°C/output @ 20°C) @ 20ppm	80 to 90
Sensitivity @ 50°C	% (output @ 50°C/output @ 20°C) @ 20ppm	95 to 105
Zero @ -20°C	ppm equivalent change from 20°C	< ±1
Zero @ 50°C	ppm equivalent change from 20°C	< -1 to 10

SO2-BE Sulfur Dioxide Sensor SO2 Sensor CROSS SENSITIVITY
Filter capacity	ppm·hrs	4,000
H2S sensitivity	% measured gas @ 20ppm H2S	< 2
NO2 sensitivity	% measured gas @ 10ppm NO2	< -180
Cl2 sensitivity	% measured gas @ 10ppm Cl2	< 35
NO sensitivity	% measured gas @ 50ppm NO	< -30
CO sensitivity	% measured gas @ 400ppm CO	< 8
H2 sensitivity	% measured gas @ 400ppm H2	< 1.5
C2H4 sensitivity	% measured gas @ 400ppm C2H4	< 0.1
NH3 sensitivity	% measured gas @ 20ppm NH3	< 0.1

SO2-BE Sulfur Dioxide Sensor SO2 Sensor KEY SPECIFICATIONSP
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	< 13

Matched Transmitter board for SO2-BE SO2 Sensor

4-20mA Analogue Transmitter Board
• Factory calibration, custom-set for immediate use
• Wide operating voltage range
• Low RFI susceptibility
Alphasense 4-20 mA analogue transmitter boards provide a cost effective way for Original Equipment Manufacturers to engineer transmitter heads for fixed installation systems.