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UK Alphasense High-Resolution Sulfur Dioxide Sensor (SO2 Sensor) 4-Electrode SO2-B4 SO2-B4+

The UK alphasense high-resolution sulfur dioxide sensor (SO2 sensor) with 4 electrodes

UK Alphasense high-resolution sulfur dioxide sensor (SO2 sensor) 4-electrode - SO2-B4 SO2-B4+

Resolution up to 5ppb
High accuracy
Good Linearity

Product Model: SO2-B4 SO2-B4+

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Product Introduction

1. UK Alphasense Sulfur Dioxide Sensor (SO2 Sensor) SO2-B4 SO2-B4+ Description:

SO2-B4 sensor is a PPB sensor designed for ambient air quality applications with excellent baseline stability. This product is available in standard format (SO2-B4) and a version with our patented integrated smart technology (SO2-B4+), which integrates an IST board with memory chip and temperature sensor into the sensor. Sensors with + store specific calibration, specification, and identification data on each sensor, allowing plug-and-play operation. The onboard temperature sensor improves the accuracy and simplicity of temperature compensation algorithms.

2. UK Alphasense Sulfur Dioxide Sensor (SO2 Sensor) SO2-B4 Features
Resolution up to 5ppb
High accuracy
Good Linearity

3. UK Alphasense Sulfur Dioxide Sensor (SO2 Sensor) SO2-B4 Typical Applications
Air Quality Trace Sulfur Dioxide Monitoring, Sulfur Dioxide Gas Transmitter

UK Alphasense Sulfur Dioxide Sensor (SO2 Sensor) SO2-B4 SO2-B4+ Dimensions:

4. UKalphasense Sulfur Dioxide Sensor (SO2Sensor)SO2-B4Performance

Sensitivity	2ppmSO2，nA/ppm	275~520
Response Time	t90From zero to2ppmSO2(s)	<60
Zero Current	At20℃Zero air at (nA）	-100~100
Noise*	Average Noise (ppb）	<5
Detection Limit*	ppb	1
范围	SO2Warranty Detection Range (ppm）	100
Linearity	100ppmSO₂Error atppmvalue,0-10ppmLinear at	0~-2
Overload	Stable Response to Gas Pulsesppm	200

*Requires low-noise voltage regulator circuit to achieve noise and resolution

5. UKalphasense Sulfur Dioxide Sensor (SO2Sensor)SO2-B4Lifespan

Zero Drift	Annual Change in Laboratory Airppb	<±20
Sensitivity Drift	Annual Percentage Change in Laboratory Air	<±15
Working Life	Output Drops to80%Time of Raw Signal (months) (Warranty24months)	>36

6. Sulfur Dioxide Sensor (SO2Sensor)SO2-B4Environmental

-20℃Sensitivity at	2ppmat (-20℃Output at/20℃Output at)%	70-90
50℃Sensitivity at	2ppmat (50℃Output at/20℃Output at)%	90-110
-20℃Zero at	Reference20℃whenppmChange Amount	0~-10
50℃Zero at	Reference20℃whenppmChange Amount	10-30

7. Sulfur Dioxide Sensor (SO2Sensor)SO2-B4Cross Sensitivity

Filter Capability	ppm*hours H2S	450
H₂S	20ppm H2SMeasured Sensitivity Percentage	<2
NO₂	10ppm NO2Percentage Sensitivity of Measured Gas	<-120
Cl₂	10ppm Cl2Percentage Sensitivity of Measured Gas	<-80
NO	10ppm NOPercentage Sensitivity of Measured Gas	<4
CO	10ppm COPercentage Sensitivity of Measured Gas	<3
H₂	400ppm H2Percentage Sensitivity of Measured Gas	<0.5
C₂H₄	400ppm C2H4Percentage Sensitivity of Measured Gas	<1
NH3	20ppm NH3Percentage Sensitivity of Measured Gas	<0.1
CO2	5% CO2Percentage Sensitivity of Measured Gas	<0.1

8. Sulfur Dioxide Sensor (SO2Sensor)SO2-B4Key Parameters

Temperature range	℃	-30~50
Pressure range	Kpa	80-120
Humidity range	Continuous Relative Humidity Percentage (see notes below)	15-90
Storage Life	3-20℃Sealed Storage Life (months)	6
Load Resistance	Ω(Recommended UseISBCircuit Board)	33-100
Weight	Grams	<13

UK Alphasense Sulfur Dioxide Sensor (SO2 Sensor) SO2-B4 SO2-B4+ IST Board Data:

9.Sulfur Dioxide Sensor (SO2 Sensor) SO2-B4Matching Sensor Board:

Unique Sensor Board (ISB) Alphasense B4 4-Electrode Gas Sensor - ISB

This unique sensor board (ISB) is used for the Alphasense B4 series four-electrode gas sensors. This regulator provides dual-channel voltage output.

Low-noise bandgap provides bias voltage to NO sensor, while ISB can measure oxidizing (CO, H2S, SO2, and NO) and reducing (O3 and NO2) gases.

ISB is configured in four versions for specific sensors: NO, NO2, O3, and CO/H2S/SO2.