What does it mean when the gas concentration measured by the gas detector is 0PPM?
The gas concentration value measured by a general gas detector is 0PPM, which does not mean that there is no gas to be detected on site, because the ppm concentration of a gas detector is called a concentration unit per million, and 0ppm means 0 per million, but 0ppm is not It means that there is no gas that needs to be detected on site. It should be understood that the impurity gas content is very small, which may exceed the detection limit of the instrument. That is to say, the gas detection instrument cannot support the detection of trace gas concentrations such as PPB levels, so there will be gas detection instruments. Circumstances that cannot be tested.
The gas detector ppm means the concentration of the solution. That is, if there is 1/1000 ml of solute in 1 liter of aqueous solution, its concentration (mass fraction of solute) is 1 ppm. The gas concentration measured by most gas detection instruments is the volume concentration (ppm). According to the regulations of our country, especially the environmental protection department, the gas concentration is required to be expressed in mg/m3 as the unit of mass concentration. PPM is a way of expressing the concentration of a solution, and PPM means parts per million. For solution: that is, there is 1/1000 ml of solute in 1 liter of aqueous solution, then its concentration is 1 PPM. For gas: One of the ways to express the concentration of pollutants in the ambient atmosphere. Volume concentration expression: the volume of pollutants contained in one million volumes of air, that is, PPM, the gas concentration measured by most gas detectors is volume concentration (PPM), and our country's standard specifications are also used expressed in mass concentration units. It is manufactured by using some metal oxide semiconductor materials, and at a certain temperature, the electrical conductivity changes with the change of the ambient gas composition.
