Vapor Monitoring and Control: Choosing the Right Filter

Vapor Monitoring and Control: Choosing the Right Filter

Vapor monitoring and control using a benchtop fume hood utilize filtration to effectively clean air for safe recirculation into a working environment. The level of performance is a combination of two primary factors; the affinity of the filtration medium to the pollutant species, and the filter’s capacity.

Matching a filter to a specific vapor or particulate is accomplished using established safety data sheets or by conducting preliminary identification of the materials. It is also important to calculate the capacity of the filter against the amount of a given vapor or particulate species. These two characteristics are fundamental in achieving high-quality filtration over an extended service life, to ensure safe and reliable vapor monitoring and control.

In this blog post, Glas-Col explores the various Aitfiltronix filter types available to help you choose the right medium for your vapor monitoring and control applications.

Acid Gas Filters

Some acids demand specialised gas filters that combine the standard absorptive capacity of carbon with an acid-specific catalyst, which breaks down complex compounds into their constituent elements for easier retention. This facilitates easier vapour monitoring and control for a range of process acids.

Activated Carbon Filters

Comprising either steam-activated charcoal or coconut shell carbon filtration medium, activated carbon filters can adsorb on average 33% of their own weight in organic vapors and odors. This is due to the material’s wide microporosity. Air is drawn through the large network of pores in the activated carbon filters, forcing pollutants to adhere to the microporous structure.

Dual-stage activated carbon filters are equipped with a vapor monitoring port for additional process controls. However, the containment hood’s blower may need to be altered to facilitate vapor monitor integration.

Specialty Carbon Filters

Standard carbon filtration media, like activated charcoal and coconut shell carbon, have reduced capacities for certain reactive gases such as ammonia. In vapor monitoring applications with reactive gas species, it may be preferable to utilize a specialty filter of treated carbon that can actively break down compounds to improve adsorption.

Common specialty carbon filters available from Glas-Col are treated to handle ammonia gas, formaldehyde, mercury, and radioactive iodine. Specialty applications can be met with novel filtration media if necessary.

HEPA Filters

High-efficiency particulate air (HEPA) filters are advanced systems that can effectively retain nanoscale particulates with a theoretical efficiency of 99.99%. Particles as small as 300 nanometers (nm) or below can be extracted from processing environments, offering reliable retention of particulates such as dust, bacteria, pathogens, and spores.

If your particle and dust monitoring application involve very small particles, Glas-Col also supplies ultra-low particulate air (ULPA) filters which can remove particles as small as 100nm from processing environments.

Vapour Monitoring and Control with Glas-Col

Glas-Col is one of the US’s leading suppliers of vapor monitoring and control instrumentation for laboratories of all scales. We recently explored the advantages of benchtop laboratory instruments for vapor and dust control, and are happy to answer any questions you may have about guaranteeing air purity in your facility. Please contact a member of our team with any questions.