Features
- Reproducible Standardized Performance Characteristics
- All Units are Manufactured to Gauge
The Collison Nebulizer was first described in the scientific literature by Collison in 1935, according to May.1 Over the intervening years, it has become the recognized technique for atomizing liquids and suspensions. The original version had 3 jets and BGI is responsible for the standardization and publication of the 6-jet version.2 The National Sanitation Foundation adopted a special version of the Collison as a Standard for challenging biohazard enclosures. The current version of that unit, CN31, has been rendered obsolete by the unavailability of the special Pyrex jars utilized with it. In order to overcome this difficulty, the metal portion of the instrument has been lengthened and a shorter (crown glass) jar is now utilized. This new model is known as the CN31I. The need for replacement jars for the original CN31 is supported by the availability of an adapter ring (CN31/A) which will permit the use of the newer, shorter jars (CN31J).
Nebulization is taken to mean a refinement of two fluid atomization. In an atomizer, a gas is used to aspirate the liquid into a (usually) sonic velocity gas jet, wherein it is sheared into droplets. In a nebulizer, this liquid/gas is impacted against a barrier (the inside of the jar) to remove the larger fraction of the droplets.
The NSF type of Collison Nebulizer is a modification of the MRE, which is manufactured by BGI. MRE stands for Microbiological Research Establishment, located in Porton, England.
The NSF Collison Nebulizer is manufactured from Nickel plated brass, with the exception of the stem and jet body, which are fabricated from 316 stainless steel. All "O" rings are buna N or silicone rubber. No flat gaskets are utilized.
Specifications |
Max width |
3.25 in (8.25 cm) |
Jar Diameter |
2.25 in (5.72 cm) |
Ordering Information
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NSF Collison |
Replacement parts |
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Replacement bottle for CN31I |
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Adapter ring, CN31 to CN31J |
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Jet clean out drill (all models) |
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6-jet nozzle only |
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Lid with Swagelock fitting for CN31I |
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"T" Stem-Short for CN31I |
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"O" ring for "T" Stem (ea.) |
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Replacement "O" ring for CN24, 25, and 31 (new feature introducted in 1994 - does not fit older models with CN32) |
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Replacement plug screw for stem "T" and fill hole in jar top - 6/pkg. |
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Replacement "O" ring for plug screw - 6/pkg. |
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Teflon Ferrule |
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Flat Ferrule |
1. May K.R. (1973) The Collison Nebulizer. Description, Performance & Application J. of Aerosol Science, Vol. 4, #3, p. 235.
2. Gussman, R.A. (1984) Note on the Paricle Size Output of Collison Nebulizers, Am. Ind. Hyg. Assoc. J (45).
Copyright © 2006 by BGI / Modified:
Thursday, January 3, 2008
