Powered air-purifying respirator differs from other air-purifying respirators
  2022/07/08| View:776

Air purifiers range from relatively inexpensive disposable masks (sometimes called dust masks) to more durable, reble masks with replaceable filters, then there are the high-performance powered air-purifying respirator and self-contained breathing apparatus (SCBA). So What's the difference?

 

1.Mechanical respirators (masks, masks)

The mechanical filter respirator filters out the harmful particulate matter of the polluted air through the filter material, to ensure human health. Filter half mask with breath valve.

 

The Mechanical filter can remove pollutants from the air in the following ways.

 

When the particles in the air stream follow the first line flow into a radius of the fiber and adhere to the fiber, through the interception. By impact, larger particles that can not follow the curve of the airflow are forced to embed directly into one of the fibers. It increases with the decrease of fiber separation and the increase of air velocity.

 

Through an enhanced mechanism called diffusion, in which gas molecules collide with the smallest particles, particularly those less than 100 nm in diameter, thereby impeding and delaying their path through the filter. The effect is similar to Brownian motion and increases the likelihood that either of the two mechanisms will stop the particles from moving. It dominates at lower air velocities.

 

By using certain resins, waxes, and plastics as coatings on the filter material to attract electrostatically charged particles to keep them on the filter surface.

 

Through gravity and the particles settled into the filter material (this effect is usually negligible). And after using a filter, by using the particles themselves act as a filter medium for other particles.

 

 

2.Chemical respirators

A chemical respirator removes gases, volatile organic compounds (VOCs) , and other vapors from the breathing air by chemical adsorption or absorption.

 

A typical organic gas respirator is a chemical respirator. Its filter element is a metal or plastic shell, which contains 25 to 40 grams of adsorption medium, such as activated carbon or some resins, used to absorb harmful gases. When the filter core is saturated or the particles in it begin to restrict the airflow, it must be replaced.

 

Chemical respirators are generally used for emergency escape in situations where the concentration of harmful gases poses a danger to life or health. Not used in normal times.


powered air-purifying respirator


3.powered air-purifying respirator

A powered air-purifying respirator (PAPR), absorbs contaminated air, removes a certain amount of pollutants, and then returns the air to the user.

Each powered air-purifying respirator includes an electric fan that forces incoming air through one or more filters before entering the user's breathing area.

The configuration of the powered air-purifying respirator will be different in a different environment. The filter type must match the contaminant to be removed. Some papers aim to remove fine particulate matter, while others are suitable for the treatment of volatile organic compounds, such as those found in spray paint. At the same time, the filter element of the organic compound filter must be changed more frequently than the particle filter.

 

 

4.Self-contained breathing apparatus (SCBA)

A self-contained breathing apparatus (SCBA) typically has three main components: a high-pressure cylinder (for example, 2200 to 4500 pounds), a pressure gauge and regulator, and an inhalation connection (port tube, face mask, or full face mask), attached and mounted on a carrying frame or seat belt with adjustable shoulder straps and belts so that they can be worn on the back.

 

5.There are two types of SCBA: open and closed. Most modern SCBA is circuit-breaker.

Open-circuit industrial rebreathers filled with filtered Compressed air. The air supply is rapidly depleted as the Compressed air is sucked in and exhaled from the loop through the regulator. The cylinders are made of composite materials such as aluminum, steel, or fiberglass encased in aluminum. Most open-circuit industrial respirators are of the"Positive pressure" type, which provides a steady flow of air to prevent smoke or fumes from escaping into the mask. Other SCBA's are"On-demand", providing air only when the regulator senses the user inhales. For safety reasons, all fire departments and personnel working in toxic environments use positive pressure SCBA.

 

The closed-circuit SCBA acts as a respirator to filter, replenish, and recycle exhaled gas. Closed-circuit SCBA can be used in situations where longer respiratory gas supplies are required, such as in mine rescue and long tunnels, where the passage is too narrow for narrow large open cylinders.

 

Shine was founded in 2001 to provide the world's leading integrated personal protective equipment and respiratory solutions. If you have any questions about powered air-purifying respirator, please contact us directly.