Tag Archives: MEMS

Fan Static Pressure

Welcome to All Sensors “Put the Pressure on Us” blog. This blog brings out pressure sensor aspects in a variety of applications inspired by headlines, consumer and industry requirements, market research, government activities, and you.

Fan Static Pressure

Fan static pressure is one of the two parameters that define the performance of a fan. The other, and more common, is the volume of air the fan delivers per minute or per hour. Fan static pressure is the resistance pressure the fan has to blow against to move air in the desired direction.

For PC gamers, high airflow and high-pressure static fans are two distinct classifications. High-pressure static fans are used on radiators, central processing unit (CPU) and graphic processing unit GPU coolers, in front of hard drives, and other places where airflow might otherwise be blocked by an object. Because of their high-pressure capability, they can overcome the restrictions caused by the blockage.

Cooler Master Masterfan Pro 120 Air Pressure Fan

The Masterfan Pro 120 Air Pressure Fan is ideal for funneling concentrated air short distances at hot components or through tight spaces.  Image courtesy of Cooler Master.

In wood drying operations, kiln static pressure is not a constant and depends upon the performance of the fan chosen. For example, replacing a small fan generating 45,000 cubic feet per minute (cfm) at an estimated pressure of 0.5 inches H2O in a kiln with a larger fan rated at 60,000 cfm at 0.5 inches of H2O will not achieve 60,000 cfm. The actual air flow will be less than 60,000 cfm due to the rise in the static pressure – a situation that can cause complications in the end application.

In heating, ventilating and air conditioning (HVAC) systems, static pressure measures the effectiveness of the fan to the ducts in a particular installation.  If the static pressure is too high, the HVAC unit will have to work harder to push the air through the duct work.

In all of these low-pressure situations, an accurate microelectromechanical systems (MEMS) pressure sensor with a digital output, such as All Sensors DLLR Series, can address the manufacturing, installation verification or ongoing operation measurements.

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The Pressure in an Iron Lung

Welcome to All Sensors “Put the Pressure on Us” blog. This blog brings out pressure sensor aspects in a variety of applications inspired by headlines, consumer and industry requirements, market research, government activities, and you.

The Pressure in an Iron Lung

Before today’s respirators, patients with several breathing problems relied on a machine called an iron lung. Unlike the modern respirators that use positive pressure (greater than 1 atmosphere) that force air into the lungs, the iron lung was a negative pressure ventilator. The machine surrounded the person and the sealed cavity’s pressure was reduced to induce inhalation by the patient and then the pressure was increased to 1 atmosphere (15 psi or 750 mmHg). While all but obsolete today, these types of machines were extensively used when patients with polio were treated because of loss of muscle control that extended to their ability to breath. Thankfully, Dr. Jonas Salk discovered a vaccine to prevent polio (in 1953) and subsequent vaccines have eliminated polio as a health problem and today positive respirators using microelectromechanical systems (MEMS) pressure sensors can be so small that they are portable.

Iron Lung

The pressure gauge in this iron lung has been replace in modern respirators by MEMS pressure sensors. Source: Pittsburgh Post-Gazette website.

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Pressure Makes Great Sparkling Wines

Welcome to All Sensors “Put the Pressure on Us” blog. This blog brings out pressure sensor aspects in a variety of applications inspired by headlines, consumer and industry requirements, market research, government activities, and you.

Pressure Makes Great Sparkling Wines

Interested in a little taste of the bubbly? Well, why not? The effervescence adds a substantial taste difference to wine that many people enjoy. Opening a bottle may be a little tricky based on the pressure inside of it. Depending on the wine and the manufacturer, the pressure typically can range from 70 to 90 psi. That’s about five to over six times atmospheric pressure. No wonder the cork can fly across the room if the proper precautions are not taken.

Champagne Under Pressure

Source: https://www.finedininglovers.com/stories/champagne-bottle-secrets/

In Champagne and other sparkling wines, the pressure is created by carbon dioxide, which forms naturally as yeast interacts with grape sugars. Different fermenting, bottling methods and the type of grapes as well as aging are key factors in the actual pressure inside the bottle.

For example, the pressure in a Champagne bottle from France is about 6 bar (90 psi) and, in contrast, a bottle of Prosecco, from northeast Italy, has a pressure of about 3.5 bar (51 psi). Since it has to withstand more pressure, Champagne actually uses a heavier bottle, something a winery would want to know to avoid problems. While putting a pressure sensor on each bottle of wine is impractical, testing each manufactured bottle or at least verifying the manufacturing processes’ capability to consistently provide bottles that can withstand a maximum pressure is just a good manufacturing practice. For these applications, the accuracy and cost effectiveness of microelectromechanical systems (MEMS) pressure sensors that can measure 100 psi certainly makes sense.

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Large Pressure Drop Indicates a Bomb Cyclone

Welcome to All Sensors “Put the Pressure on Us” blog. This blog brings out pressure sensor aspects in a variety of applications inspired by headlines, consumer and industry requirements, market research, government activities, and you.

Large Pressure Drop Indicates a Bomb Cyclone

One of the first weather oddities to hit the United States in 2018 was the bomb cyclone, or bombogenesis, as meteorologists call it. This type of winter storm with unusually low temperatures is indicated by a low pressure drop of at least 24 millibars (0.35 psi) in 24 hours. With normal pressures around 1000 millibars (14.7 psia) near sea level, this represents a 2.3% change from the normal reading.

In this year’s bomb cyclone, the pressure dropped by 54 millibars in 24 hours, more than twice the standard criteria, indicating a very strong storm. In fact, it was considered one of the greatest rapidly deepening rates ever observed by the National Weather Service.

With the continuous resolution capabilities of microelectromechanical (MEMS) pressure sensors, even the change of a few millibars can be easily observed with an absolute pressure sensor.

NOAA GOES-16 Weather Satellite

The 2018 bomb cyclone as observed from the GOES-16 weather satellite, which is operated by the National Oceanic and Atmospheric Administration.

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Do you have a pressure sensing question? Let us know and we’ll address it in an upcoming blog.
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