Multi-branch gas sampling pipe

Abstract

An air sampling tube with multiple branch is prepared as using tube fittings to connect master sampling tube to front end sampling tube, arranging an internal tube and an external tube on said master sampling tube, setting block plate at middle between said internal and external tubes, arranging an air vent and a hot air inlet at external tube above block plate, arranging a flow guide opening and a standard air inlet as well as multiple sample collection opening on external tube below block plate and connecting flow guide opening and standard air inlet as well as various sample collection openings separately to regulation port on a gate valve connected with flow guide pump.

Description

technical field [0001] The invention relates to a gas sampling tube, in particular to a multi-branch gas sampling tube. Background technique [0002] In order to accurately measure the concentration of harmful substances in the atmosphere, it is necessary to introduce the ambient atmosphere into an automatic monitoring station and send it to various gas analysis instruments for detection. During the transportation of the sample, the external environment may change (meteorological conditions such as temperature and humidity), how to keep the state unchanged, that is, the sample gas does not condense, the residence time is short and can be controlled, it is necessary to design a special sampling header. At the same time, the sampling main pipe should also have the function of calibrating various environmental detection instruments with standard gases. When using the traditional method to calibrate the instrument, three-way solenoid valves and TEFLON (polytetrafluoroethylene) ...

AI Technical Summary

Problems solved by technology

When using the traditional method to calibrate the instrument, three-way solenoid valves and TEFLON (polytetrafluoroethylene) tubes are often used. If multiple instruments are calibrated at the same time, multiple three-way solenoid valves must be connected, which increases the number of three-way solenoid valves. The adsorption of gas through the solenoid valve, and the connection method is complicated, easy to be confused, the pipeline is lengthened, and the gas pressure in the tube increases, which brings inconvenience to the calibration work and also brings errors to the measurement.

The traditional sampling main pipe also includes a heating device to avoid the condensation of water vapor caused by the temperature difference between the outdoor atmosphere and the automatic monitoring station, but the effect is not obvious, and the high heating temperature will destroy the composition of the sample gas, resulting in measurement errors

The traditional sampling manifold also includes a draft fan, whose working condition is often very unstable, resulting in an uncertain residence time of the sample gas in the sampling manifold

Images