Hydrogen Sulfide (H2S) Sensor:
Prana Air H2S sensors work on the principle of electrochemical sensing, these are highly precise and used across the board for consumer-level products like air quality monitors, industrially used in factories where H2S can be an issue, and for research purposes as well. Due to their high accuracy and versatility, these sensors can be used in multiple environmental conditions and maintaining their accuracy precision.
– Flexible use for both fixed and portable detection
– Dimension 15 x 15 x 3 mm size
– Precision of Measurement: upto 50ppm
– In compliance with ROHS
Hydrogen Sulphide is a colorless chalcogenic hydride gas in nature having bad & foul smell similar to rotten egg. The gas is toxic in nature, inflammable and acts as a hazard to environment and public health. The inhalation of this toxic gas can result in eye, nose and throat irritation, headaches, dizziness, etc and when exposed for prolonged period to high levels may lead to shock, coma and death. The common sources includes wastes from human and animal, waste water treatment plant, crude petroleum, volcanic eruptions and hot springs.
Our H2S sensors minimal size enable them to be used in both, stationary and handheld mobile devices.
The H2S sensor is the market leader when it comes to the longevity of the sensor with an operational life of up to 10 years.
Our sensors bring down the average observation time from multiple hours to mere seconds.
With our Hydrogen Sulfide sensor, we would not have to worry about the power consumption of the device as our compact sensors are not only compact but compact in energy consumption too.
Individual calibration service procures readings with the highest accuracy for every device the sensor is put in.
Heath and safety are of prime importance, and our product’s compliance with RoHS assures that there is no toxic and hazardous material in the sensor.
Technology We Use
What technology is being used in H2S Sensor?
The electrochemical method of monitoring is one of the most sought-after methods of determining the concentration of H2S in the atmosphere. In this method, the air sample is fed into the sensor which has electrodes, a working, and a counter electrode along with an ion conductor.
H2S reacts with the electrolyte and oxidized to form water molecules and also ions. These ions produce current in the sensor and the amount of current produced is directly proportional to the concentration of hydrogen sulfide in the environment.
Calibration is comparing the actual/ standard measurement with your instrument or device measurement. Calibrating the device or instrument helps in determining the accuracy of instrument and measurement traceability. The sensor is exposed to H2S in the range of interest to calibrate the sensor accurately. NIST standard of gas cylinder is used as a reference for the target gas. 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.
H2S Sensor Dimension
Specifications of H2S Sensor
|Range of measurement||0 to >20 ppm|
|Lower limit of detection||< 20 ppb|
|Resolution||< 20 ppb|
|Repeatability||< +/- 3 % of reading|
|Response Time||Typically less than 15seconds|
|Sensitivity (nA/ppm @ 5ppm)||-60 +/- 10 nA/ppm|
|Expected life of operation||> 5 years (10 years @ 23+/-3C; 40+/-10% RH)|
|Operating Temperature Range||-300 to 500|
|Operating Humidity Range – non-condensing||0 to 100% RH (15 to 95% recommended)|
|Power Consumption||10 to 50 uW (circuit & ambient O3 dependent)|
Where is it applicable?
About Hydrogen Sulfide (H2S) Gas
Hydrogen sulfide is a compound formed during the breakdown of organic compounds in absence of oxygen. This gas is also found in sewers, drilling operations for oil, and volcanos. This is a corrosive and poisonous gas with a rotten smell. H2S along with the air is highly explosive. It remains in the atmosphere for a few hours before converting into other oxides.
Major sources of H2S are naturally occurring:
– It is found during oil extraction and operation
– Sewers have a high concentration of H2S due to anaerobic reactions.
– Solid organic compounds containing sulfur reacting with oxygen.
– There is a high concentration of H2S in wastewater treatment plants.
– Volcanos are also a major source of H2S.
Though there are ways to remove H2S from the environment but they are not feasible and are only restricted to experimental studies. Monitoring is the only good way to detect the gas for any preventive and corrective measures. Prevention and corrective ways are the only way through which we can avoid being in contact with this harmful gas.
Some corrective measures to prevent and avoid the gas:
– Avoid open disposal animal waste
– Avoid open sewers as there can be a high concentration of H2S.
– Proper ventilation for the area where you detect the gas.
– Gas masks when exposed.
Health & Environment Impact of H2S Gas
Get to know the effects of hydrogen sulfide gas to our health.
H2S is a rotten smelled gas that has a very adverse effect on the human body and in extreme situations death too. It causes the following symptoms when exposed to the gas at high levels:
– Affects the person’s ability to sense smell
– Eyes, nose and throat irritation
– Breathing difficulties
– Shock, convulsions
– Coughing, dizziness, nausea
– Headache, coma, death
H2S is one of the main compounds responsible for acid rain. It reacts with water molecules in the atmosphere and forms sulfuric acid. it is also a potent corrosive agent and ruins metal structures and reduces their life spans costing the government.
– Increases the chances of leakage of other harmful gases in environment
– Persists for longer duration in environment
– Convertible to sulfur dioxide and sulfuric acid
– Induces toxicity in plants at high levels
– Inhibits growth of plants
– Affects vegetation, constructed building, agriculture
Applications Of H2S Sensor
Indoor Air Quality
Outdoor Air Quality
Fixed Industrial Safety
Portable Industrial Safety
Leakage Detection in Sewage
Frequently Asked Questions
1. Will this H2S sensor come along with a digital board or not?
The sensor does not come with a digital board but if it needed, additional purchase of digital board is recommended. Prana Air provides a USB micro controller and a digital board which both have to be attached.
2. 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.
3. What is the warranty period of H2S sensor?
Prana Air provides warranty of 6 months only on manufacturing defects.
4. What connectivity is used in H2S sensor?
Prana Air also has a USB micro controller and a digital board. The H2S sensor is connected through the DGS to the USB to UART Bridge.
5. How dangerous is hydrogen sulfide?
As per OSHA guidelines, the personal exposure limit for general industry ceiling is 20 ppm and for general industry peak limit is 50 ppm. The level of gas can increase upto 2000 ppm in extreme cases. The exposure can lead to health problems such as conjunctivitis, nausea, teary eyes, coughing, loss of smell, and at extreme levels 1000-2000, it can cause nearly instant death. The gas is inflammable in nature and is capable to create life threatening situation like fire.
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6. How do I know I am at high risk of exposure?
People living nearby open gutters, drain systems, sewers and channels are at high risk. Also people working in petroleum industry, sewer and waste water treatment plants, sanitation department, agriculture industry, manufacturing of textiles, paper and pulp industry and mining industries are at high risk of exposure.
7. What symptoms will I feel if I am exposed to hydrogen sulfide?
The symptoms of exposure depend upon the extent of exposure. When the exposure to hydrogen sulfide is acute (shorter duration) the problems like nausea, irritation on skin and eye, headaches and convulsions are experienced. When the exposure is chronic (longer duration) it results in extremely rapid unconsciousness, dermal frostbite injury and even death in some cases.
8. What measures can I take to protect myself from hydrogen Sulfide?
Continuous monitoring of H2S using Prana monitors having H2S sensors will help you to identify the hazardous levels of H2S present, this will help you to take protective measures such as avoiding the places that are known for H2S emission, keeping the house windows closed whenever the level rises or H2S odor is detected, use of gas masks, avoiding visiting nearby sewage and waste treatment plant. However, the best method to avoid H2S exposure is installation of engineering controls at workplaces.