Permeation tubes are small, inert capsules containing a pure chemical compound in a two phase equilibrium between its gas phase and its liquid or solid phase. They are used to generate a stable conce...read more
Permeation tubes are small, inert capsules containing a pure chemical compound in a two phase equilibrium between its gas phase and its liquid or solid phase. They are used to generate a stable concentration of a specific trace chemical. At a constant temperature, the device emits the compound through its permeable portion at a constant rate.
They are typically inserted into a carrier flow to generate test atmospheres for calibrating gas analyzer systems, testing hazardous gas alarms, or conducting long-term studies of effects on materials or biological systems.
A recent application is their use as explosives, narcotics, and chemical warfare dopants for TSA airport security (ammonia, DCM), law enforcement, border patrol, military, and other trace detection industry professionals.
Write a review
Sharing your experience will help scientists like you. Achieve Reviewer Status and Win an iPad air (All reviews published will be entered into the next drawing on March 30th 2014).
Join the Global SelectScience Community Today! It’s FREE!
Helping you make informed decisions about the latest lab products and technologies:
Be the first to learn about new technologies
10,000+ trusted product reviews from your peers
Compare 500,000 products and manufacturers
Get exclusive buying tips from experts
Find solutions fast: 10,000+ Application Notes, Webinars and Videos
Connect with 250,000 scientists... All in one place!