| Description | The multi-gas detector is a set of portable gas detector, which consists of two main components - a manually operated bellows pump and detector tubes. The types of detector tubes available in the Service include Polytest; Carbon Monoxide; Chlorine; Hydrocyanic Acid; Hydrogen Sulphide; Oxygen; Trichloroethylene; Thioether; Organic Basic Nitrogen Compounds; Organic Arsenic Compounds and Arsine; Phosgene; Cyanogen Chloride and Phosphoric Acid Esters. |
| Function | The multi-gas detector is used to detect targeted gases and vapours in sewers and confined spaces. The detector tubes are glass vials filled with a chemical reagent that reacts to a specific chemical or family of chemicals. A calibrated 100 ml air sample is drawn through the detection tube with the bellows pump. If the targeted chemical(s) is present the reagent in the tube changes color and the length of the color change typically indicates the measured concentration. |