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 commentary in maroon type… The information in this Safety and Health Information Bulletin (SHIB) provides workers and employers guidance on calibrating…

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 years, many of our customers—and Interscan’s own technical personnel—have been frustrated by the confusing and inconsistent documentation on this matter…