Gas detectors, common gas detectors and fields of use – Part 2


Field of use:

Nearly all industries that use manpower need to use gas detectors if they are related to one of the following three factors: Enclosed areas, Hazardous areas with the possibility of insured gases, and Areas where chemicals may evaporate. (Gas detectors here are used in the category of safety equipment, so we will not consider measuring gas concentrations in research.)

  • Enclosed area: Chambers – enclosed rooms on ships, in mining pits, in tanks of raw materials, in pipes – tunnels – sewers in construction.
  • Areas where inexorable gases may exist: Ships, Rigs, Chemical – Petrochemical Plants, Coal Industry, Thermal Power, Pits and Paint Industry.
  • The area may have volatile chemicals or toxic gases: Factories – areas where chemicals or chemicals are used naturally, Mining areas …
  • There are also a few other areas such as: Checking the working environment periodically to see if the working environment has enough gas to breathe normally? Check the suspicious areas before entering the work.

Note to use:

A – Choose a gas detector: Choosing a user gas detector should pay attention to 2 main factors: What to measure and how to measure.

  • What to measure: The simplest requirement is to measure 4 basic gases: Explosive gas, Oxygen gas, H2S toxic gas and CO toxic gas. However, depending on many different fields, the manager in that field is most knowledgeable about the environment, there are gases that are dangerous to humans in the process of working to choose additional gases to measure. In addition, users also have to calculate what the gas concentration in that area is to choose the sensor with the appropriate measuring range. (Some sensors will cross-react with each other, so contact the manufacturer to make sure the selection configuration is correct)
  • How to measure: We have 2 main measurement applications: Personal monitoring and Confined space. For enclosed areas and potentially high-hazard areas such as tanks, safes, cellars, chemical warehouses … This area can be assessed the danger level is Zone 0 or Zone 1, we need to check the area before entering the work using the machine with Confined space function, these machines will have suction pumps, to suck air from in the closed area first to measure the concentration before people come to work.

Check the area before entering the work using the Confined Space function

Check the area before entering the work using the Confined Space function

  • For empty areas, low or non-hazardous gas concentrations or non-hazardous gases can be used with Personal monitoring function, i.e. worn on people during work.

Personal gas detectors

Personal gas detectors

  • In addition, when choosing a machine, it is recommended to pay attention to areas where inexorable gases exist, it is recommended to choose the type of machine with explosion prevention function.

B – Use of gas detectors: Some attention is as follows:

  • Power battery: Always fully charge before work, avoiding battery drain between working hours. Gas sensors can also be wrong, errors if using the machine in low battery conditions.
  • Auto zero: Auto zero and Pump test should not be turned off when starting the machine, these two functions are used to ensure enhanced safety when requesting confirmation of suction pump status and zero machine before use. Auto zero is necessarily done in a clean air area to ensure accurate measurements.
  • Automatic machine calibration: Most gas detectors need to be tested after 6 months to 1 year, including more or less use because sensors are often composed of localization or catalyst.
  • Measuring range: It is not recommended to measure excessive gas that affects sensor life and errors (long-term restoration of the state) during the next use.
  • Alarm mode: Each applicable standard has different level 1 and 2 alarm levels, so refer to the standard that is applying to adjust the alarm level accordingly.

by TESIndustry

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