Article Categories

Recent Articles

No thumbnail available

Calibrating and testing direct-reading portable gas monitors

This material is presented on OSHA's website as a Safety and Health Information Bulletin [SHIB 09-30-2013]. The content was written by the International Safety Equipment Association (ISEA). We post the article here, and offer comm[...more]
Perm tube tech:  Rigorous discussion of "K" value and best way to calculate gas concentration

Perm tube tech: Rigorous discussion of "K" value and best way to calculate gas concentration

Time to get seriously techie on perm tube calibration fundamentals... This is a detailed analysis of the so-called "K" constant used with permeation devices, to enable the calculation of the emitted gas concentration.  Over the[...more]
Atmospheric Pressure Corrections on Interscan Instruments

Atmospheric Pressure Corrections on Interscan Instruments

Atmospheric Pressure Corrections on Interscan Instruments  When a gas concentration is measured or reported, we may talk in terms of ppm, but in reality we are measuring the partial pressure of the gas. (Refer to Dalton'[...more]
Permeation devices

Permeation devices

How To Use Permeation Devices (courtesy of VICI Metronics, Inc.) Permeation devices provide an excellent method of producing known gas concentrations in the PPM and PPB level for calibration of analytical instrumentation. The ba[...more]
No thumbnail available

Monitoring the Interior of the EtO Cartridge Flammable Storage Cabinet

Within sterile processing departments, the predominant modality for ethylene oxide sterilization is the sealed EtO cartridge approach, as sold by 3M. In its Product Profile on the Steri-Gas™ EO cartridges, 3M puts forth these reco[...more]
No thumbnail available

Errant use of gas chromatography for area monitoring of ethylene oxide in SPD departments

In recent months, we have seen certain people touting systems using gas chromatography (provided with a photo-ionization detector) for area monitoring of ethylene oxide in Supply, Processing, and Distribution (SPD) departments. [S[...more]
No thumbnail available

When is a part-per-billion (ppb) NOT a part-per-billion (ppb)?

As if it weren't bad enough that clueless environmental authorities try to impose their ignorance on the field by using so-called "metric" units of gas concentration, another trap may be lurking for you. Everyone around the world[...more]
No thumbnail available

More on Expressing Gas Concentrations

This is a follow-up to our earlier article on Using Common Sense and Science in Expressing Gas Concentrations, inspired by a real-life adventure of one of our sales engineers. As our hero was slogging through some e-mail inquirie[...more]