White Papers

White Paper : Vortex Issues in Esco's Laminar Flow Cabinets (Physical Test)Author: Ng Kah Fei

This paper serves to investigate and establish the airflow pattern in one of ESCO's Laminar Flow Cabinets when a common laboratory equipment is placed in the cabinet. The objective is to determine if with the equipment placed inside the cabinet, how much turbulent flow would be generated. The cabinet that is being used for this study is a LHC-4A1 2005-10357. Drâger CH 216 smoke tubes are used to obtain airflow visualizations.



White Paper : UV Lamps in Laminar FLow and Biological Safety CabinetsAuthor: Lin Xiang Qian

Ultraviolet light is part of the electromagnetic (EM) spectrum, and is divided into 3 wavelength ranges: UV-C, from 100 nanometers (nm) to 280 nm; UV-B, from 280 nm to 315 nm; and UV-A from 315 nm to 400 nm.
The germicidal ultraviolet lamp emits high intensity ultraviolet radiation concentrated around the wavelength of 253.7 nm (i.e. "UV-C radiation") 95% of the radiation emitted by germicidal lamps is at this wavelength which also happens to be region of maximum germicidal effectiveness.



White Paper : The Role of The Pressure Gauge In HEPA-FIltered Clean Air DevicesAuthor: Lin Xiang Qian

HEPA-filtered clean air devices - systems conatining both a fan and a HEPA filter are prevalent today in many modern applications. They include laminar flow / biological safety cabinets (hoods) for laboratory applications, in addition to cleanroom equipment such as fan filter units. This technical paper outlines the theory of operation of the pressure gauge, which is commonly used in the industry as an indicator on HEPA-filtered clean air devices. Most significantly, common misconceptions as regards the functionality of pressure gauges with regards to HEPA-filtered clean air devices are discussed in detail. Proper usage practices are also recommended.