State system for ensuring the uniformity of measurements. Permeation tubes for Sulfur Dioxide, Hydrogen Sulfide, Nitrogen Dioxide, Chlorine, Hydrogen Chloride, Ammonia. Verification method
Rectangular iron all-cast moulding boxes having inside dimensions: length from 900 to 1200 mm, width 700; 800 mm, height from 150 to 400 mm. Construction and dimensions