BGI MRE型/NSF型 Collis

BGI MRE型/NSF型 Collison喷雾器

Collison Nebulizer

技术特性：

标准的性能和技术特征，数据可重复性高

所有部件的生产直径以Gauge为单位

典型应用领域：

空气生物学

气溶胶研究

生物危害性测试

过滤器的性能评估

很久以来美国BGI公司研制的Collison喷雾器都被公认为将各种液体气溶胶化的最有效技术。Collison喷雾器包括许多不同配置的喷雾器，经过了广泛的性能测试以确保满足不同用户的具体要求。

BGI Collison Nebulizer

Collison Nebulizers (1, 3, 6, 24 and NSF Collisons) The Collison Nebulizer has long been the recognized technique for the efficient aerosolization of various liquids. Mesa manufactures a comprehensive variety of nebulizers, all of which have undergone exhaustive performance tests.1, 3 or 6 Jet Collison NebulizerAll Mesa Collison Nebulizers have all the metal components fabricated from 316stainless steel. All O-rings are Buna-N or silicone rubber. Glass jars are either Crown Glass (standard) or Pyrex (precious fluids jar only). The 24 jet Collison jar is coated with clear PVC.

Applications

• Aerobiology

• Aerosol Research

• Biohazard Enclosure Testing

• Filter Evaluation

This describes a numerical analysis of the Collison nebulizer to determine the total number of droplets produced for a given back pressure and the count within 2 standard deviations of the mean droplet size (assuming a log-normal distribution). The Collison nebulizer can be operated with a variety of “jet” numbers depending on the attachment. Each jet requires approximately 2 Lpm of air and produces droplets with an MMAD of 2.5 µm with a GSD of 1.8. The comparable CMAD is 0.89 µm. As given in the table below, the amount of liquid in the nebulizer reservoir used per hour per jet varies depending on the backpressure applied to the nebulizer which can be computed with the following equation: To determine the number of droplets produced per jet per hour by the Collison, a resulting log-normal distribution of droplet sizes was assumed. The central concept used to determine the number of droplets produced by the Collison is that the liquid volume contained in the total of all droplets produced must be equal to the volume of liquid produced by the Collison on a per time basis. A spreadsheet was constructed with 600 diameters ranging from 0.05 µm to 20 µm in even increments on a log-basis (-3 to 3 by every 0.01 ln values). The frequency of occurrence of each diameter was computed with the use of the probability distribution function for a log-normal distribution. The volume associated with each diameter was computed using the equation for the volumeof a sphere. The “Solver” function in Excel was then used to determine the counts for each diameter that caused the sum of all volumes (for each diameter) to be equal to the volume generated per hour (as per the equation above) while weighting the count for each diameter by their computed frequency of occurrence. From the total number, the count between +/- 2 standard deviations of the mean was calculated. The results given in the table below were converted to a per minute basisand include the liquid output for a single jet as well as the estimated counts for a single, 3, 6, and 24 jet Collison.