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Miniature Size Sulfur Dioxide Sensor - SO2-D4

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• Range: 20 ppm limit of performance warranty
• Sensitivity: 180 to 420 nA/ppm in 10ppm SO2
• Response time t90: < 15 (s) from zero to 10ppm SO2
• Resolution: < 0.2 RMS noise (ppm equivalent)
• Temperature range : -20 to 50 ℃
• Pressure range : 80 to 120 kPa
• Humidity range : 15 to 90 %rh (see note below)
• Weight : < 2 g

Model Number: SO2-D4
Data Sheet:

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Product Specification

SO2-D4 Sulfur Dioxide Sensor SO2 Sensor Description
Alphasense Sulfur Dioxide gas sensors operate using proven fuel cell technology.

SO2-D4 Sulfur Dioxide Sensor size:
miniature, with proven long-term performance. Sensors designed for the next generation of 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.

Miniature Size Sulfur Dioxide Sensor Key Features & Benefits:
Small Footprint
Including the world’s smallest two-gas sensor, only 14.5mm diameter, this family of sensors allows significant savings in gas detector size.

Reduced Height
8.4mm high, making the sensor ideal for low profile instruments.

Low Weight
Less than 1.5 grams with excellent shock resistance.

Good Connectivity
Uses industry standard, low cost, Molex sockets for direct board insertion.

Reduced Costs
High quality design with a significant reduction in the cost per measured gas, allied to reduced manufacturing costs are passed on to OEMs.

SO2-D4 Sulfur Dioxide Sensor SO2 Sensor PERFORMANCE
Sensitivity	nA/ppm in 10ppm SO2	180 to 420
Response time	t90 (s) from zero to 10ppm SO2	< 15
Zero current	ppm equivalent in zero air	< ±0.7
Resolution	RMS noise (ppm equivalent)	< 0.2
Range	ppm limit of performance warranty	20
Linearity	ppm error at full scale, linear at zero and 10ppm	< 5
Overgas limit	maximum ppm for stable response to gas pulse	50

SO2-D4 Sulfur Dioxide Sensor SO2 Sensor LIFETIME
Zero drift	ppm equivalent change/year in lab air	< 0.2
Sensitivity drift	% change/year in lab air, monthly test	< 6
Operating life	months until 80% original signal (24 month warranted)	> 24

SO2-D4 Sulfur Dioxide Sensor SO2 Sensor ENVIRONMENTAL
Sensitivity @ -20℃	% (output @ -20℃/output @ 20℃) 10ppm	72 to 88
Sensitivity @ 50℃	% (output @ 50℃/output @ 20℃) 10ppm	74 to 95
Zero @ -20℃	ppm equivalent change from 20℃	< ±0.5
Zero @ 50℃	ppm equivalent change from 20℃	< ±0.5

SO2-D4 Sulfur Dioxide Sensor SO2 Sensor CROSS SENSITIVITY
H2S sensitivity	% measured gas @ 20ppm H2S	< 400
NO2 sensitivity	% measured gas @ 10ppm NO2	< -120
Cl2 sensitivity	% measured gas @ 10ppm Cl2	< -60
NO sensitivity	% measured gas @ 50ppm NO	< 3
CO sensitivity	% measured gas @ 400ppm CO	<0.5
H2 sensitivity	% measured gas @ 400ppm H2	< 0.2
C2H4 sensitivity	% measured gas @ 400ppm C2H4	< 15
NH3 sensitivity	% measured gas @ 20ppm NH3	< 0.1
CO2 sensitivity	% measured gas @ 10% CO2	< 0.1

SO2-D4 Sulfur Dioxide Sensor SO2 Sensor KEY SPECIFICATIONS
Temperature range	℃	-20 to 50
Pressure range	kPa	80 to 120
Humidity range	%rh (see note below)	15 to 90
Storage period	months @ 3 to 20 ℃ (stored in sealed pot)	6
Load resistor	Ω (for optimum performance)	22
Weight	g	< 2