How Many Oxygen Monitors Should Be Installed? Where Should I mount one?

While OSHA regulations require the use of an oxygen monitor anywhere that compressed gases or cryogenic liquids are used or stored indoors, the regulation does not provide sufficient detail for facilities on how to set up am oxygen monitor. Businesses want to comply with the regulations, but are left wondering what compliance looks like. At PureAire, we're often asked by our customers, "how many oxygen sensors should installed?" so we thought we'd provide clarification on where and how to mount oxygen monitors.

Where an Oxygen Deficiency Monitor Should be Used

OSHA regulations require that oxygen deficiency monitors be placed in any room where compressed gases are used or stored. Storage areas are frequently outside or in confined spaces, such as basements or storage closets.

When gas tanks are installed outside and the gas enters the facility by pipes, we recommend oxygen deficiency monitors be installed near the main gas connections, which is where the gas enters the facility. This might be near a machine, a food and beverage packaging dispensing machine, a 3D printer, or other tool.

With respect to a confined space where dewars of gas are kept, the oxygen deficiency monitor should be installed directly in the storage area. PureAire's oxygen monitors are designed to function optimally in confined spaces, including cryogenic freezers, and are impervious to shifts in barometric pressure. As such, they take accurate readouts of oxygen levels in confined spaces, freezers, facilities, and other places.

The oxygen monitors measure  5.12 inches wide by 4.5 inches high by 3.25 inches deep, and their small size means that they're quite easy to place about the facility, even if you need to place the O₂ monitor in a tight confined space, such as a cryogenic freezer.

Best Place to Mount an Oxygen Deficiency Monitor 

Best practice is to mount the oxygen deficiency monitor 3 to 5 feet off the ground, as well as 3 to 5 feet away from a gas cylinder.

There are situations when the oxygen monitor should be placed further away. One common example is MRI rooms, where metal is prohibited due to the strength of the MRI magnet. In these circumstances, the oxygen deficiency monitor can be mounted outside of the room, and a plastic sample draw tube used to check oxygen levels inside the MRI room.

What is the Proper Spacing of Oxygen Monitors? 

This last question may be the trickiest question to answer. Nitrogen and other inert gases have no odor or color, so they cannot be seen. The difficulty here is that it's all but impossible to say where the gas will go if there is a leak.  

We recommend that you place one oxygen deficiency monitor every 400 to 600 square feet to be safe. This works out to every 20 to 30 feet in a large space. When you use this ratio to determine the right number and spacing of oxygen monitors for your facility, you'll be adequately covered just in case anything happens. Given the deadly consequences of a nitrogen leak, it's better to be safe than sorry.  

PureAire creates oxygen deficiency monitors that are capable of withstanding some of the toughest conditions. Oxygen deficiency monitors from PureAire are designed to operate in temperatures as low as -40 C up to 55 C.     

Oxygen deficiency monitors can last for 10 or more years with no calibration. The hardy zirconium sensor needs no calibration after installation, which means that setup couldn't be easier.  

PureAire's monitors are accurate to +/- 1 percent and come with two alarm levels, 18 percent and 19.5 percent. The integrated alarms provide sufficient notification for workers to evacuate the area. The LCD display is backlit so it's easy to read. 

All PureAire O2 monitors come with a 3 year warranty. Wall mounting brackets and an optional plug-in wall power supply are included, so you can mount the unit upon receipt and protect your facility from dangerous gas leaks.

To learn more about PureAire's oxygen deficiency monitors, visit www.pureairemonitoring.com.

How to Monitor Oxygen Levels in a Room?

If you're wondering how to monitor oxygen levels in a room, look no further than an oxygen monitor. Learn how to use an oxygen monitor, where you install an oxygen monitor, and why this one little device could save a life. 

Why Should I Measure Oxygen Levels in a Room? 

Before we can answer the question of how to measure oxygen levels in a room, we must look at why you're measuring oxygen levels in a room. 

Humans need oxygen to breathe. The air's natural oxygen concentration is around 21 percent; however, natural oxygen in the air can be displaced by certain gases, including nitrogen and argon. If nitrogen were to leak in a closed space, oxygen levels would fall. Since nitrogen and other inert gases have no color or odor, it's not as if you can spot a nitrogen leak occurring. 

When oxygen levels fall below the safe threshold, which is 19.5 percent, health hazards may occur. With only a few breaths of oxygen deficient air, you could fall unconscious and suffocate. Given these safety risks, leak detection systems are necessary. 

What is an Oxygen Monitor? 

An oxygen monitor is a device that measures oxygen levels in the room, to ensure the air has enough oxygen for respiration. Also called an oxygen deficiency monitor or an O₂ monitor, an oxygen monitor uses a sensor to measure oxygen levels. By tracking oxygen levels, gas leaks can be detected even though the leaking substance cannot be seen or smelled. 

Oxygen monitors come with a range of features, including built-in alarms that go off when leaks occur. There is usually a loud alarm (designed to be heard over machine noise) as well as a flashing light. 

Oxygen levels differ in their setup and maintenance needs, which makes the question of how to use an oxygen monitor a little more challenging to answer. Some brands of oxygen monitor require annual maintenance and calibration. Other styles of oxygen monitor, such as those sold at PureAire, do not need calibration after installation. PureAire's O₂ monitors are designed to work efficiently and accurately for 10 or more year after installation, saving time and money. 

Where You Install an Oxygen Monitor? 

Oxygen monitors should be installed anywhere there is a risk of gas leaks. Place one oxygen monitor in any room where you store inert gases and in any room where these gases are used. This way, if you have a helium, argon, or nitrogen spill -- for instance, in a university science lab -- the oxygen sensor will detect the lower levels of oxygen and sound the alarm. 

How do You Install an Oxygen Monitor?

Oxygen monitors can be mounted on the wall using a bracket and screw, then connected via plug-in-the-wall power supply. Alternately, oxygen monitors can be hardwired with the services of an electrician. It's your choice. We recommend that oxygen monitors be installed 3 to 5 feet off the ground, and 3 to 5 feet away from any obstacle, such as a gas tank. 

Oxygen monitors deliver peace of mind that your employees and your facility are protected from the hazardous side effects of a gas leak. They may be required by industry regulations. To get an industry-leading oxygen monitor that's maintenance-free, look to PureAire.

Where Can I Buy an Oxygen Monitor?

You know you need an O₂ monitor, but where do you get one, and how much does it cost?  Selling oxygen deficiency monitors is our business, so we've rounded up information to choose the right oxygen deficiency monitor for your needs. 

Who Should Use an Oxygen Deficiency Monitor? 

An oxygen deficiency monitor should be placed anywhere that inert gases, such as argon or nitrogen, are used or stored. Industries that use an oxygen deficiency monitor include: 

• Research & development – Laboratories often perform testing using nitrogen, argon, or CO2.
• Medical gases- Used in hospitals, or labs requiring ultra-purity (99.9%) inert gases or nitrogen gas.
• MRI facilities- Helium gas surrounds the MR magnet to protect from overheating while in operation.
• Pharmaceutical- Nitrogen is used in cryogenic freezers and CO₂ or dry ice is commonly used for shipping heat sensitive prescription drugs.
• Cryotherapy- Nitrogen gas is used to create on-demand low temperatures quickly for therapy. Used for treating people to reduce inflammation.
• Cryopreservation- N₂ gas is used in the process of cooling and storing cells, tissues, or organs at very low temperatures to maintain their viability.
• Universities- Many schools specializing in medicine, sciences, or aerospace require nitrogen gas, argon gas, or carbon dioxide for experiments and long-term research.
• Semiconductor- Ultra purity nitrogen gas or other inert gases are required to reduce corrosion and oxidation on wafers or in semiconductor tools.
• Food & Beverage- Nitrogen gas or CO₂ is used to rapidly flash freeze food, or increase the shelf life of packaged foods and beverages.
• OLED- Nitrogen gas is used to reduce oxidation in printing chambers maintaining the quality of the substrate.
• 3D Printers- Argon gas and nitrogen gas are used in printers to reduce corrosion and protect metals from being a source of ignition, most commonly titanium metals.

What is an Oxygen Monitor Alarm?

An oxygen monitor alarm goes off if oxygen levels fall to a critical threshold, which is defined by OSHA as below 19.5 percent. 

The type of alarm varies by the specifications of the oxygen deficiency monitor you're considering. At PureAire, our oxygen monitors have two alarm levels, for 19.5 percent and 18 percent. The built-in alarm operates at 90 decibels, so workers can hear the alarm over facility noise. The optional horn and strobe combination amplifies the alarm. 

Alarm relays link alerts with third party communication systems, such as control panels, PLCs, or fire alarm systems for maximum versatility. 

How Much Does an Oxygen Monitor Cost?

Oxygen monitors range in price from $1,500 to $4,500, depending on if you need percentage or ppm accuracy. 

Where Can I Buy an Oxygen Monitor? 

Now that you understand the different features available in an oxygen monitor, as well as who should have an O₂ monitor, you're ready to research and buy. We're partial to PureAire products, but we always recommend that you review the specifications of any oxygen deficiency monitor so you understand what features the product has and whether it's right for you. PureAire includes a sensor lasting 10 year or more which is usually more desirable when you’re planning on using an oxygen monitor longer than 2 to 3 years.

You can buy an oxygen deficiency monitor online from the manufacturer, directly though distributors, and through commerce outlets as well. 

PureAire works with various distributors such as Airgas, Air Liquide, Linde, Air Products, Fisher Scientific, and Johnson Controls.

One note of caution here, especially if you use the internet to research oxygen monitors. A number of products may come up when you search for O₂ monitors that are NOT the correct product to detect gas leaks. You may find search results for the following products when you begin to look for oxygen monitors online: 

• Finger oxygen monitor
• Blood oxygen monitor 
• Pulse oximetry monitor 
• Oximeter
• Baby monitor 

As you may guess from the names, these other monitors are commonly used in medical and pharmaceutical settings. The price point will be far less than what you would spend for the type of oxygen monitor we're talking about. The other oxygen monitors are also found in stores and online at pharmacies: Walgreens, Target, CVS, and the like. 

When you review the product specifications, make sure the product you've found does what you need it to do: Monitor levels of oxygen in the air to detect a gas leak that could harm your facility and workers. 

If there are other questions you have about shopping for an oxygen deficiency monitor, we're here for you. Chat with us online or email us today. 

Gas Distributors and Specialty Gas Suppliers Are the Key to Technology Companies

The technologies that power laptops, smartphones, LED televisions, and other technologies rely on one hidden ingredient: Gas. Compressed and inert gases help create a pure environment, control the temperature, and carry other substances for a high-quality end product. See how the different gases used play a pivotal role in technology product development and also how they introduce health and safety risks into the workplace. 

Compressed Gases Used in Technology Devices 

The most common compressed gases used in technologies include argon (Ar), helium (He), and nitrogen (N₂). 

Liquid and gas helium have a range of uses in science, laboratory, manufacturing, and technology settings. Within the semiconductor industry, helium keeps the manufacturing environment pure so that no unwanted chemical reactions occur. Since helium conducts heat efficiently, it stabilizes the temperature when silicon is introduced in the semiconductor manufacturing process. Helium's ability to cool quickly aids in a range of uses, from chilling semiconductor wafers to keeping an MRI magnet cool.  

Nitrogen (N₂₎ gas aids with the liquidous stage of semiconductor manufacturing, where the solder is wetting the surface to create a good bond. Since nitrogen flushes out oxygen, it's also used during the purging process. 

Some semiconductor manufacturing facilities have opted for nitrogen generations onsite rather than N₂ delivery from a commercial gas supplier. Since nitrogen is one component of air, it can be distilled for purity onsite using a generator. 

Like helium (He) and nitrogen, argon or Ar is inert. This gas is introduced in the sputtering phase of semiconductor manufacturing. Since argon maintains a highly pure environment, it prevents silicon crystals used in semiconductors from developing impurities. 

To source these gases, semiconductor, LED, and other manufacturers turn to compressed gas providers, who offer on-demand delivery of combustible gases. The chief gas distributors include Praxair, Airgas, Air Liquide, Linde, Matheson Tri-gas, and BOC.

The Hidden Dangers of Specialty Gas

While these specialty gases are highly useful, there is a danger associated with their use. Helium, nitrogen, and argon all deplete oxygen from the air. In the manufacturing process, this is a desired trait. Oxygen can cause flaws in the final product. 

Where trouble starts is when leaks occur and the specialty gas escapes into a closed room. Leaks can develop in supply lines, storage canisters, or nitrogen generators. These gases have no scent or color, so employees would not see or smell an argon leak. 

Within minutes of a leak, oxygen levels can fall from typical levels to deficient levels, which means that the air in the environment does not have enough oxygen for respiration. Employees can experience fatigue, dizziness, cognitive confusion, and respiratory distress. A few breathe of oxygen deficient air can render someone unconscious. Once an employee loses consciousness, the risk is death via asphyxiation. 

By tracking levels of oxygen using an oxygen monitor, employers can prevent workplace accidents and injuries and protect the well-being of their employees. An oxygen deficiency monitor tracks oxygen levels 24/7 and provides fast notification if oxygen levels plummet due to an inert gas leak. 

Just as these gases can leak in the semiconductor manufacturing plant, they can leak at the gas distributor as well. Leaks arise when storage equipment and supply lines develop holes, when storage dewars are not properly sealed, or when the equipment is used in a manner for which it was not originally intended or designed.

While end manufacturers are well aware of the risks of an oxygen deficient environment, there is less talk of the need for protection in gas distribution facilities. Wherever He, Ar, and N₂ are used or stored, oxygen monitors should be installed as a precaution. 

How an Oxygen Deficiency Monitor Works

An oxygen deficiency monitor has a built-in alarm to provide LED and sound alert when oxygen levels fall to the critical defined threshold, which is 19.5 percent. PureAire's monitors work in confined spaces, including basements and freezers, and function at temperatures of -40 C. PureAire's oxygen monitors are built to withstand 10+ years of use without subjectivity to barometric pressure shifts or temperature changes. The zirconium sensor needs no annual maintenance or calibration.

If you're looking for a reliable product that is easy to use out of the box, consider PureAire's O₂ monitor. Learn more about PureAire's oxygen deficiency monitor or read customer testimonials at https://www.pureairemonitoring.com or www.oxygenmonitors.com

Source:

http://summitsourcefunding.com/blog/helium-is-a-critical-part-electronics-supply-chain 
https://www.onsitegas.com/semi-conductor-nitrogen.html

Why Gas Distributors Play a Crucial Role in Most Everyday Businesses?

Inert gases power a wide range of industries, including pharmaceutical, automotive, manufacturing, and semiconductor. While argon, helium, nitrogen, and cryogenic gases have benefits and uses, there are also risks with other gases such as halogens, refrigerants, combustibles, or etching gases. Gas detectors can monitor storage areas and facilities where these gases are used to guard against gas leaks onsite. Learn why it's critical to use one of these monitors in combustible gases distribution facilities.

The Role of Gas Distributors

Unless companies are manufacturing their own gases onsite through, for instance, a nitrogen generator, they rely on prompt delivery of gases they need for operation.

Gas distributors store a range of inert gases for use by manufacturers. Industry regulations mandate that gas distributors follow certain guidelines for the storage and disposal of these substances to reduce the risk of fires, explosion, gas leaks, and other incidents.

When everything is working correctly, gas flows as its needed from the supply tank to, for instance, storage dewars which are then readied for delivery. If a supply line develops a leak or a storage tank is not properly sealed, gas will leak into the air.

Many of these gases have no smell, color, or odor. This means that even if a facility is following all regulations regarding gas storage, there is no way that an employee could detect a gas leak in the moment when something goes wrong.

If storage dewars are compromised, gas will leak in the storage truck and at the delivery site, spreading the risk to third parties.

When one of these toxic gases leaks into the air, the consequences are dangerous. Hydrofluoric acid, a highly corrosive substance, is harmful to the health when it's inhaled or in direct contact with skin. Ammonia, which is commonly used as a refrigerant and in paper making, irritates the skin, lungs, and eyes.

Some gases are flammable when in contact with oxygen, which elevates the risk of fire. Others, like nitrogen, deplete oxygen from the environment. When oxygen drops below a critical threshold, workers can experience respiratory distress, cognitive distress, and ultimately death via asphyxiation.

To provide fast notification and decrease the risk of health hazards, it is recommended to install a universal gas detector wherever toxic gases are used or stored. To further guard against leaks, gas distributors can invest in durable equipment and train staff on proper handling of substances and appropriate emergency responses.

How a Universal Gas Monitor Can Protect Your Staff

A universal gas monitor can detect levels of gases even when the eye and nose cannot.

OSHA, the Occupational Safety & Health Administration, oversees worker safety in all environments, including gas distribution plants. OSHA requirements to prevent workers from being harmed at work include the use of a gas monitor where dangerous substances are used. By installing a universal gas detector, you can bring your gas distribution plant in line with mandatory requirements to keep workers safe on the job.

Not all gas monitors are created equal. It's important to choose a gas monitor that is flexible, especially if you work with a range of substances, and reliable for continuous operation. Gas monitors that do not take accurate readings place worker health at risk, because they may fail to spot a low-level leak.

PureAire's universal gas monitor detects a wide range of gases, including:

·        Ammonia

·        Chlorine

·        Fluorine

·        Hydrogen chloride

·        Hydrogen fluoride

·        Nitrogen dioxide

·        Phosphine

·        and more

PureAire's universal gas monitor is designed to function optimally once set up with no routine maintenance. The renewable sensor lasts for 3 to 8 years on average. Unlike other monitors, PureAire's sensor is rechargeable onsite, to save your gas storage facility time and money. While employees can check interface readouts for peace of mind, the gas detector works 24/7 out of the box. If the unit experiences a problem, error readouts are related to the control room.

Since the monitor has a built-in LCD display, employees can check substance levels at a glance. Dual level alarm relay contacts allow gas distributors to choose the appropriate level for their purposes. Alarms provide employees with sufficient notification to close valves, exit the area, and reduce the risk of fire.

PureAire is an industry leader with more than 15 years of experience developing oxygen monitors and universal gas detectors. Our products provide reliable reports to increase safety and peace of mind. Learn more about our universal gas monitor and view full product specifications online.

 https://www.pureairemonitoring.com/universal-gas-detector/

https://www.pureairemonitoring.com/paint-booths-or-areas-using-combustible-gases/

https://www.chemicalsafetyfacts.org/ammonia/

Crispr and the Editing of Genes: To Help Revolutionize Biomedical Science

Scientists from MIT and Harvard University are placing their faith in a gene editing tool that may revolutionize the treatment of deadly diseases. CRISPR, which stands for Clustered Regularly Interspaced Short Palindromic Repeats, has the potential to unlock the next generation of treatments for conditions like cancer, ALS, or Alzheimer's. Learn how CRISPR is poised to change genome editing and biomedicine over the next few decades.

How Does CRISPR Work? 

Bacteria within the body have their own innate intelligence -- the fascination with the microbiome being one example of this scientific principle.

Scientists observed that bacteria was able to fight infections by retaining a slice of DNA from invading viruses, so they could recognize if the virus returned and mount a faster defense. If the intruder returns, the body's natural CRISPR goes after it. Scientists were able to create their own CRISPR, which they can use to edit genes.

You may remember all genes contain chemical basis, referred to by the letters C, G, A, or T. A genetic typo creates markers for disease. Scientists can search for specific bad combinations using CRISPR -- for instance, the gene that would cause ALS -- and then slice out the faulty gene and replace it with something innocuous. By doing this before someone gets sick, the theory goes, CRISPR can save lives. 

Already, scientists are using CRISPR to breed mosquitos that cannot transmit malaria, an application that would save thousands of lives. Others are working to create a stronger rice plant that can withstand floods and drought caused by climate change.

There are a few examples that illustrate the power of CRISPR.

Scientists are still figuring out the true potential of this genome editing tool, however, there is great promise and great enthusiasm for CRISPR's potential from scientists across the globe. In the meantime, laboratory workers must preserve genes and tissue samples for vitality using a nitrogen freezer.

Keeping Tissue Safe in the Laboratory Setting

Nitrogen freezers maintain ultralow temperatures of -150 to -200 Celsius. When genetic material is frozen at such a low temperature, it goes to sleep. The material can be thawed and reanimated for use in the lab setting. Along with low temperatures, the key to maintaining the vitality of the tissue is a slow freeze and thaw. If cells were to freeze too quickly, their cell membranes would burst. The same holds true for thawing frozen tissue. Thus, nitrogen freezers are a mainstay of the lab setting because they provide a reliable, efficient way to keep genomic materials chilled until use.

Any time nitrogen is used, there is a risk of accident if the nitrogen leaks or spills. Nitrogen does not have a color, scent, or odor, which means lab workers wouldn't notice a leak -- although they might notice if, say, the freezer door did not fully close.

Like other inert gases, nitrogen displaces oxygen. If the nitrogen freezer were to leak, the laboratory could lose so much oxygen that workers would experience respiratory distress. To safeguard against a leak, laboratories must use an oxygen deficiency monitor.

An oxygen deficiency monitor tracks the level of oxygen in the lab through constant monitoring. Since nitrogen displaces oxygen, this monitor can detect a gas leak by noting falling levels of oxygen. A digital display indicates the current amount of oxygen in the room, providing assurance for lab staff that everything is working as it should. If oxygen falls to the critical threshold as defined by OSHA, an alarm goes off. Lab workers can exit the premises and wait for emergency personnel to respond.

PureAire creates robust oxygen monitors trusted within the scientific and biomedical communities. PureAire's oxygen deficiency monitors work in freezing temperatures and confined spaces, remain accurate despite barometric pressure shifts, and last 10 or more years without calibration. 

To learn more about PureAire's products, visit www.pureairemonitoring.com

sited sources:

https://www.cbsnews.com/news/crispr-the-gene-editing-tool-revolutionizing-biomedical-research/

https://www.thermofisher.com/us/en/home/references/gibco-cell-culture-basics/cell-culture-protocols/freezing-cells.html

NASA's Uses the Largest Airborne Telescope Observatory in the World

NASA's latest project, a joint collaboration with the German Aerospace Center, breaks new ground for scientific discoveries. The new Stratospheric Observatory for Infrared Astronomy (or SOFIA, as it's known) makes use of a modified Boeing aircraft and a reflecting telescope to enable spatial observations far more detailed than anything a land-based telescope could see. Get a sneak peak inside SOFIA and learn how an O₂ monitor plays a pivotal role in keeping SOFIA safe. 

SOFIA's Mission 

The airplane that powers SOFIA is a short-body 747, which is capable of burning through 3,600 gallons of jet fuel per hour. The plane has been extensively modified to support its new mission, which is to observe the universe using the infrared spectrum of light. This is light that is invisible to the human eye. Interestingly, many objects within space emit only infrared light, meaning that astronomers cannot perceive them with the naked eye. 

SOFIA uses a lot of specialized equipment to make these infrared emissions visible. The telescope on board has a 100-inch diameter. The instrument panel contains cameras, spectrometers, and photometers which operate along near, mid, and far infrared wavelengths to study different scientific phenomena. 

The telescope must be kept clean and properly chilled to see the infrared light. Bathing the telescope in liquid nitrogen keeps it properly chilled, so the telescope can detect midrange and far-out light sources. Nitrogen is used for both of these purposes because it is cost-effective, readily available, and will not damage the sensitive equipment. 

SOFIA will allow astronomers to observe star birth, star death, black holes, and nebulae. It's difficult to forecast what other findings SOFIA may facilitate. 

In some cases, distant objects are blocked by clouds of space dust, much like the sun can become blocked by clouds.  While the space dust prevents these far-off objects from being seem, their infrared energy still reaches SOFIA's powerful telescope. By studying the infrared light captured on SOFIA's instruments, astronomers can learn about new phenomena and come to a better understanding of complex spatial molecules, new solar systems, planets, and more. 

Why SOFIA Needs an Oxygen Deficiency Monitor 

One small but mighty piece of equipment onboard the special aircraft is an oxygen deficiency monitor. SOFIA's powerful telescope must be cooled with liquid nitrogen. The nitrogen storage tank is located inside the crew department. 

Nitrogen gas is heavier than oxygen. In the event of a leak, the nitrogen would actually displace oxygen molecules, causing the cabin air to become deficient of oxygen.

Oxygen-deficient air causes respiratory and cognitive problems within minutes, leading to death via asphyxiation. Since this gas has no color or odor, there is no way the crew can tell there is a leak onboard. This is where the O₂ monitor comes in: By taking continuous readouts of cabin oxygen, the oxygen monitor allows staff to check ambient oxygen levels at a glance. Staff receive peace of mind that everything is operating smoothly as well as a fast alert if oxygen approaches hazardous levels due to a leak of nitrogen gas. 

If a nitrogen leak does occur, the plane must make an emergency landing—aborting the mission to save the life of the personnel onboard. If something goes wrong while SOFIA is in flight, and the aircraft has to land before the mission is complete, the cost of wasted fuel is (pardon the pun) astronomical. 

Since there is so much riding on the oxygen monitor, NASA needed a reliable product, one that would not drift from changes in barometric pressure. While there are many oxygen deficiency monitors, several products on the market are sensitive to barometric pressure shifts. PureAire offers hardy O₂ monitors that are capable of maintaining reliable performance despite barometric changes. 

Our O₂ monitor lasts for 10 or more years after installation with no maintenance required, thanks to a robust zirconium sensor that outperforms the competition. After installation, our oxygen deficiency monitor needs no calibration to continue working accurately. If there is a nitrogen leak, the oxygen deficiency monitor provides two built-in alarms, which operate at 90 decibels. These alarms—which correlate to 19.5 percent and 18.0 percent oxygen—provide the SOFIA crew with sufficient notification of any problems, so they can return to safety. 

It's thrilling to have our products be a part of such a vital mission, and we cannot wait to see what new discoveries SOFIA facilitates. Closer to home, PureAire supports clients in a range of industries with high-value, long-lasting oxygen monitors suitable for use anywhere they are needed. Learn more about PureAire's products at pureairemonitoring.com.

Source

https://space.stackexchange.com/questions/12295/why-do-some-space-telescopes-require-cooling-sometimes-down-to-3k