How to choose a gas detector in a closed environment?
Detection of harmful gases by confined space detectors:
The detection of harmful gases in enclosed spaces requires the detector to enter for detection in advance. Before personnel enter, it is necessary to remotely detect the composition of harmful gases in the confined space. Perform testing in the following order:
(1) Confirmation of oxygen and detection of current oxygen concentration levels;
(2) Confirmation of flammable gases and detection of changes in flammable gases;
(3) Confirmation of toxic gases and detection of whether the concentration of each toxic gas is below
The allowable exposure limit PEL specified by OSHA. The commonly toxic gases in confined spaces are hydrogen sulfide, carbon monoxide, and other toxic compounds are not included. The detector launched by RAE company can detect both single and mixed toxic gases.
Sampling and detecting the concentration of various gases or vapors at the top, middle, and bottom of a confined space is very important. Some gases are lighter than air (such as methane and flammable gases) and can be collected in the upper part of a confined space; Some gases have a heavier specific gravity than air (such as hydrogen sulfide) and can be found at the bottom of enclosed spaces; There are also other gases that are almost as heavy as air (such as carbon monoxide) and can be detected in the middle of a confined space.
Sampling at different heights in a confined space and conducting continuous testing with the detector based on actual conditions will reveal different detection results.
As a remote air detector deployed in a secure area, we can safely enter restricted areas based on its uninterrupted detection information. A confined space entering the detector probe or observation port continuously sends detection results to peripheral personnel. With leaks, toxic vapor releases, or changes in space, even without an alarm, the conditions in a confined space are constantly changing.
Detectors are used for confined space entry
RAE recently launched an innovative Confined Space Entry Detector (CSE) that includes all the functions of a multi gas detector. Named Q-RAE Confined Space Entry Detector. This instrument has many convenient tools preset for testing gases required by OSHA 29CFR 1910.146. Due to these presets, we can work more efficiently when detecting flammable gases, hydrogen sulfide, carbon monoxide, and different levels of oxygen.
Oxygen concentration
The oxygen concentration level given by OSHA is 19.5% -23.5%. MultiRAE has preset alarms for this, and when it is below 19.5% and above 23.5%, the instrument will issue an alarm. Users can choose this setting to issue an alarm function under harmful conditions.
Flammable gas
The concentration of flammable gases is below 100% LEL. MultiRAE also pre sets alarms. The alarm for flammable gases is set at a concentration of 10% LEL, and the high alarm value is set at 20% LEL. Users can choose the desired setting point themselves.
Toxic gas
The alarm value is pre-set within the exposure limit range allowed by OSHA. The preset low alarm value for hydrogen sulfide in MultiRAE is 10ppm, and the high alarm value is 20ppm. The preset low alarm value for carbon monoxide is 35ppm, and the high alarm value is 200ppm. These values can be selected by users according to their actual needs. MultiRAE also provides toxic gases
