Very simply, since no two toxic gas detection applications are the same. We admit that this concept has been obscured under the quite false rubric that “All gas detection is confined entry.” Certainly, a goodly percentage of all portable gas detection instruments are designed as if they are intended for the confined entry application. These…
A detector tube is a graduated glass tube filled with a chemical reagent that will produce a color change, when exposed to the gas in question. It is used with a hand pump that will draw a sample into the tube. The tubes are generally supplied in packages of ten, and are sealed at both…
First, let’s define the terms: “Continuous” monitoring means that each sampling point is being monitored all the time, and in most cases, the concentration displayed reflects what is truly happening at the point in real time. There are certain exceptions to this involving instrument techniques that run batch analysis, but that is beyond the scope…
Thanks for your question. The answer depends on what you mean by “double,” and even on how we define “detector.” Usually, “detector” means the sensing element within the instrument. But, people sometimes refer to the entire instrument as the detector. Now, if the sensor for carbon monoxide also responded to propane, this would not be…
Introduction It is quite unlikely that you will ever use an absolute method for gas detection. Rather, you will employ any one of dozens of “relative” [or “reference,” but not necessarily EPA Reference] methods—that is, methods that use a sensor to produce some electrical output that must be calibrated against a known standard. Then, its…
As discussed in the Calibration Basics Knowledge Base article, Interscan’s gas analyzers, and virtually all other direct-reading gas analyzers are not absolute methods. Rather, they employ “relative” [or “reference,” but not necessarily EPA Reference] methods. That is, methods that produce some output that must be calibrated against a known standard. Generally, these units must also…
Ever since Interscan developed a portable hydrazine analyzer for Brooks Air Force Base, way back in the late 1970’s, our instruments have been widely deployed in all facets of hypergol (pertaining to fluid propellant) fuel and oxidizer measurements. A new wrinkle was brought in when NASA requested an instrument with 10 parts-per-billion (ppb) sensitivity. Here…