GASTEC Permeation Tube

This is a tube used in the calibration gas regulator Permeator PD-1B and PD-1B-2. By maintaining a constant temperature and feeding a constant amount of dilution gas, a constant concentration of calibration gas can be obtained continuously. The permeation tube method is adopted in Japan by the Enforcement Regulations of the Offensive Odor Control Act and in the Work Environment Measurement Guidebook published by the Ministry of Health, Labor and Welfare, and in the United States it is used as the standard method by NIST (National Institute of Standards and Technology) and EPA (U.S. Environmental Protection Agency).