Sulfur Dioxide SO2 Sensor
20 PPM Pinned Package


Rs. 2,250

prana air so2 sensor

20 PPB SO2 Sensor (Low Resolution)

Prana Air SO2 sensors are made with precision and fineness for both industrial-grade and consumer-grade safety monitoring. The sensor is based on electrochemical technology for highly toxic SO2 gas. The sensor allows easy inclusion of all monitoring and regulatory solutions as it has ultra-thin packaging, and is compact and cost-effective. The sensors are robust, have higher operational life, and diversified applications for commercial, industrial, and residential grade instruments.

prana air 1 ppb so2 sensor

1 PPB SO2 Sensor (High Resolution)

High-resolution sensors are available in PPB and PPM variants making them highly suitable for various applications for portable and fixed detecting instruments, Environmental Monitoring Systems (EMS), and networks.

– Fineness and precision
– Resolution: 1 PPB
– Dimension 20mm x 20mm
– Stable response
– Electrochemical technology-based

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Sulfur Dioxide is a toxic gas having a burnt odor. The odor of sulfur dioxide is similar to that of nitric acid. The gas is acidic erosive and is capable to form dangerous compounds like sulfuric acid and sulfate pollutants by reacting with atmospheric compounds. The sources that release sulfur dioxide in nature are fossil fuel burning, power plants, metal extraction, volcanoes, industrial facilities, different vehicular emissions, refining and extraction of oil, and diesel engines. However, the push toward BSVI engines by Indian Government has made a significant impact. 

Why To Choose Prana Air SO2 Sensor?

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The compact size of the sensor enables it to be installed into any kind of setting, big or small, allowing it to be versatile in handheld as well as stationary devices.

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The SO2 sensor comes with a long life of almost 10 years. With this kind of longevity, there is no need to worry about calibration and breakdown.

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Highly Responsive

Prana Air SO2sensor is not only precise but swift too with an average response time of 15 seconds.

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Energy Efficient

With our sensors, there is no need to worry about energy consumption as not only they are accurate but energy saving too.

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Individual Calibrated

Sulfur Dioxide sensors are calibrated for every device before integration for providing accurate observation.

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RoHS Compliant

Our sensors are in sync with the guidelines set by the RoHS for the restriction of hazardous substances in electrical and electronic equipment.

Technology We Use

What technology is being used in SO2 Sensor?

Prana Air provides the best in class air quality monitoring solutions providing accurate observations. Our monitors use an electrochemical sensor for so2 monitoring which is the most sought after monitoring among different monitoring processes. Our SO2 sensor works on the principle of the electrochemical gas sensing technique. These sensors are amperometric fuel cells designed to quantify the concentration of a gaseous toxin.

The technique involves three components out of which two are electrodes (working and counter) and the other is an ion conductor. The ion conductor is the bridge for electrodes. When SO2 passes through the sensor a current is generated between the electrodes due to oxidation and reduction reaction. The current generated is directly proportional to the concentration of SO2 present.

prana air so2 sensor

Sensor Calibration

Calibration of the sensor is comparing the standard measurement with your device’s measurement. To calibrate the sensor, 23 + 3oC temperature, 50 + 15% relative humidity, 0.9-1.1atm pressure and air velocity of 0.05m/s were used as standard environmental conditions. The accuracy and traceability of measurement are also determined by calibration. For calibration, the NIST standard of gas cylinder is used for reference.

SO2 Sensor Dimension

Prana Air SO2 Sensor Dimension
prana air so2 sensor specification

Technical Indicators of 20 PPB Sensor

Parameter Value
Measurement Range 0 to 20 ppm
Lower Detection Limit < 20 ppb (instrumentation dependent)
Resolution < 20 ppb (instrumentation dependent)
Repeatability < +/- 3 % of reading
Response Time < 15 seconds
Sensitivity @ 200 mV bias 25 +/- 10 nA/ppm
Expected Operating Life > 5 years (10 years @ 23+/-3C; 40+/-10% RH)
Operating Temperature Range -30 to 50 C (-20 to 40 C continuous)
Operating Humidity Range – non-condensing 0 to 100% RH (15 to 95% continuous)
Power Consumption 10 to 50 uW (circuit & ambient SO2 dependent)
prana air sulfur dioxide so2 sensor digital board

Measurement Methods of SO2 Monitoring

There are 3 industry’s preferred monitoring solutions for sulfur dioxide monitoring.

U.V. Fluorescence

In this method of monitoring. An air sample is taken and exposed to a beam of UV radiation, The SO2 in the gas gets excited by the absorption of the UV. It results in the emission of fluorescence radiation of 320-380 nm. This radiation is passed through a particular filter which only allows a certain wavelength of radiation and permits it to pass to the photomultiplier tube detector. HIgher the reading of this radiation higher the concentration of the gas.

Semi-conductor method for SO2 monitoring

In this type of monitoring a metal oxide semiconductor is exposed to the air sample. The metal oxide surface reacts with the SO2 molecules in the air and dissociates into charged ions which alters the resistance of the film. The interaction is measured as a signal and converted via calculation to respective concentrations. This is a very high energy-consuming process.

Electrochemical method for SO2 monitoring

The electrochemical sensor for so2 relies on the diffusion of so2 into the sensor which results in the electrical signals proportional to the so2 concentration. The electrochemical method is the most sought-after for air quality monitoring as it is more accurate and inexpensive than other monitoring solutions. This is accurate for very low levels of ambient air quality monitoring

Health & Environmental Impacts of SO2 Gas

Let’s find out the harmful effects of sulfur dioxide gas on our health.

If there is a high concentration of SO2, you can easily inhale SO2, which eventually sticks to the membrane of the nose and respiratory tract. Its short health impact can be felt quickly but the long-term impacts are very dangerous even to the extent of reduced lung capacity. It results in difficulty in breathing and tightening of airways. People with comorbidities are at high risk as it can aggravate those conditions to a point of no return.

– Eyes, nose, throat and lung irritation,

– Cough, wheezing, phlegm

– Heart diseases

– Risk of asthma attacks increases in children

– Respiratory tract inflammation and irritation

– Cardiovascular problem

The impact of SO2 on the environment is beyond comprehensible. It limits plant growth and also damages leaves turning them yellow. At a high concentration in the atmosphere, it reacts with atmospheric moisture to create an acidic compound responsible for acid rain and damaging soil properties.

– It damages and stains stones including culturally important monuments and statues.

– Impact plant growth by damaging exposed tissues in leaves

– Contributes in haze formation

– Reduction in visibility, neural activity disruption

– Increased chances of acid rain

– Affects the vegetation, growth of plants

– Deteriorates leaves quality and color

– Affects marine life by acidifying the water ways

– Alters soil properties, agricultural land properties

Sources Of Sulfur Dioxide Gas

– Volcanic eruption is one of the many natural causes of sulfur oxides.

– Fossil fuels and especially the ones with a low filtration process have a high volume of sulfur in it which helps in the formation of many sulfur oxides.

– Among these combustion of fuels in plants and processes including extraction, refining of oil, etc are the major source of sulfur dioxide formation. Internal combustion engines, especially diesel engines are the major sources of sulfur dioxide production in urban areas. Indian government’s push for BSVI engines has made a significant impact on pollution as a whole.

Sulfur Oxides are present in the atmosphere at low concentrations. Most of it is by human activities including the burning of fuel and essentially ship fuel as it has a high concentration of sulfur. In urban areas, a high concentration of sulfur oxides is detected. The life of sulfur dioxide in the atmosphere is less than a week during which it reacts with other atmospheric pollutants and forms various different compounds. When SO2 reacts with the oxygen present in the environment, it forms sulfur trioxide which dissolves with water vapor and forms sulfuric acid (H2SO4), a major acid rain component. It forms secondary pollutants like smog and particulate matter after attaching itself to dust particles which is quite harmful to the health and environment.

Corrective Measures

For the solutions to contain so2 concentration, first we need to monitor it and identify the areas where its concentration doesn’t meet the recommended standards. After identifying the target areas, some of the below mentioned corrective measures can be implemented:

– Promote sustainable energy sources.

– Alternative fuels like hydrogen cells, electrical, etc.

– Accommodations away from industrial areas

– Switch to a renewable source of energy such as solar, wind, and hydropower

– Use zero sulfur content fuels

– Accommodate in areas away from industry

– Avoid exercising during high pollution days

– Installation of power plants with scrubbers

Where is this sensor applicable?

applications of prana air so2 sensor

Applications of SO2 Sensor

Air quality monitoring equipment

Air Quality Monitoring

application of so2 for Industrial

Industrial Safety

application of so2 Automobile

Automobile & Locomotive

application of so2 for Power plants

Regulatory Instruments at Power Plants
& Oil Refineries

application of so2 for vehicle emissions

Vehicular Emission Detectors
& Controllers

application of so2 sensor for Retrofit devices for dg sets

Retrofitting Devices
For DG Sets

Frequent Asked Questions



1. What are the factors that can affect the working of the sensor?

The factors such as water, salt contamination, operation at high temperature, and low humidity for a prolonged period can affect the performance of the sensor.

2. Will the sensor come along with a digital board or not?

The sensor does not come with a digital board but if needed, an additional purchase of a digital board along with the microcontroller is recommended.

3. What conditions are used for calibration?

The standard environmental conditions for sensor calibration used are 23 + 3oC temperature, 50 + 15% relative humidity, 0.9-1.1atm pressure and air velocity of 0.05m/s. The alteration in environmental conditions may affect the sensitivity of sensor but is easily compensated.

4. What is the duration of warranty for the sensor?

Prana Air provides 6 months warranty on the sensor only on manufacturing defects.

5. What connectivity is used in H2S sensor?

Prana Air provides our own solution for the connectivity of the sensor through a USB microcontroller and digital board to UART Bridge.

6. What is the safe level of exposure for SO2?

According to NIOSH and OSHA, the personal exposure limit for SO2 is 2 ppm and 5 ppm respectively.

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