A floating bacteria sampler is an instrument used to collect airborne bacteria

working principle

-Impact principle: Using the principle of aerodynamics, air containing planktonic bacteria is made to pass through the sampling port of the sampler at a certain flow rate and collide with a petri dish or sampling strip containing culture medium. The planktonic bacteria in the air are trapped on the culture medium, and after cultivation, the number of planktonic bacteria in the air is determined by counting the colonies growing on the culture medium.
-Filtering principle: Air is passed through a specific filter membrane through an exhaust device, and airborne bacteria in the air are trapped on the filter membrane. Then, the filter membrane is transferred to a culture medium for cultivation and counting.

structural composition

-Sampling head: It is a key component of a sampler, including a sampling port, impact plate, or filtering device, used to collect airborne bacteria.
-Vacuum pump: Provides power to allow air to pass through the sampling head at a certain flow rate.
-Flow control system: Ensure the stability of air flow during the sampling process to ensure the accuracy of sampling.
-Culture dish or sampling strip: used to carry culture medium and receive collected planktonic bacteria.
-Control system: used to set parameters such as sampling time and flow rate, and control the operation of the sampling process.

performance metrics

-Sampling flow rate: Generally expressed in terms of the volume of air collected per minute, common sampling flow rates include 28.3L/min, 100L/min, etc.
-Sampling efficiency: refers to the ability of a sampler to collect airborne bacteria, usually expressed as a percentage. The higher the sampling efficiency, the closer the collected number of airborne bacteria is to the actual value.
-Impact velocity or filtering accuracy: The impact velocity and filtering accuracy of the impact sampler will affect the sampling effect. Appropriate impact velocity or filtering accuracy can ensure the effective collection of planktonic bacteria of different particle sizes.