title: Use of detector tubes under extreme conditions (humidity, pressure, temperature).
abstract: Detector tubes are mainly used in a temperature range between 0 degrees C and 40 degrees. At lower temperatures systematic minus indications may occur, high temperatures cause plus indications. By utilizing simple warming-up methods or cooling devices the temperature of the gas to be tested can be adjusted to a temperature which which is suitable for detector tubes. Humidity often influences chemical reagents. In detector tubes this interfering effect can be eliminated by special drying preparations. The reading of most of the detector tubes is directly proportional to the absolute air pressure. Pressure correction can be done easily by the gas law.
mesh_terms: D000399:Air Pressure; D005740:Gases / Q000032:analysis*; D006813:Humidity; D009787:Occupational Medicine / Q000295:instrumentation*; D013696:Temperature; D014887:Weather
chemical_list: D005740:Gases