Gas Detection Instruments Use Different Methods

2007-04-12 11:34:06

( Business )



Most drivers must be familiar with the simplest gas detection method for leaks. When you examine pneumatic tires, you immerse the tubes being tested in water, apply gas or air pressure, and detect where the leaks are by observing where the gas bubbles escape. This method has limited application because water has limited uses for leaked gas detection. There are more sophisticated gas detection methods in use.

Gas detection instruments may be used after a leakage occurs. In such cases, the detector will help measure the amount of gas remaining in a chamber after a leak. This would be very important, for example, in power plants that use gas powered generators; if leaks occurred somewhere in the system, the technicians will need their natural gas detectors to check the vicinity where the leak occurred.

Some gas detection instruments are colorimetric devices. They use particular reagents that changes color in the presence of certain gases. These may be used to detect reactant gases like ammonia, carbon monoxide, chlorine, ethyl alcohol and others. The gas detection device has an aspirator, with a bulb and pump into which you insert the detector tube. When you compress the aspirator bulb, air goes through the detector tube. In the presence of leakage gases, the reagent changes color. Colorimetric gas detection devices detect the presence of hydrogen sulfide.

Other gas detection monitors use physical properties. Some may use a radioactive source to generate electron-capture cells, which can test for leaks that may issue from transistors and similar electronic components. Others measure changes in thermal conductivity, and this is the technology used in testers for refrigerant and cable leakage.

To hunt for leaks, technicians may use halide lamps to detect the presence of halogen vapor. In recent years, electronic leak detectors have appeared for use in place of halide lamps and older gas detection technologies.


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