Gas Detectors
Deadly Spill
The very thought of a gas leakage and the consequences can send a shiver down the spine of any person. The ease with which these gases have occupied an important place in our lives and the havoc that they can create is enough to think about a gas detector. The potential of these gases used for cooking, running vehicles and even for energy at homes is alarming. Moreover, the problem with these gases is that they cannot be detected easily or without any help from a special gadget viz. a gas detector.
The speed with which these leakages take place and the alarming effect it has even with the minutest initiation are the factors that should be considered seriously. A gas detector, designed to detect the leakage of gases through their storage devices can effectively alarm a person regarding the presence of any harmful gases in the surroundings.
Gas Detectors: The Idea
The very concept of a gas detector is based upon presence of gaseous molecules in the air and the provision to trap these molecules, detect them and raise a positive alarm warning the occupants of the leakage. In order to have a useful gas detector, it is important that the requirement of the type of gas detector based upon the type of leakage is finalized in no uncertain terms. The history of the gas detector and accidents clearly shows that most of the time, it is the lack of proper knowledge and equipment (gas detector) that leads to a hazardous environment exposure and accident.
The great relief is that technology is on our side and has advanced significantly providing us with some sophisticated gas detectors. However, particular attention is required to be paid to the sensors used in a gas detector and their ability to detect the gases present. Generally hazardous gases such as Methane, Propane, Gasoline, LPG etc can pose a serious threat to the safety environment at home and office. Based upon an accurate and appropriate sensor configuration, a gas detector can help identify the hazard and protect people.
The Gas Detector Sensors
The most important part of a gas detector is the sensor, for it is this the part of a gas detector which is going to actually sense or detect the presence of any hazardous gases in the atmosphere and initiate the control unit to release the warning light or sound alarm. There are numerous methods for sensing the presence of gases in the surroundings. Let us discuss a few of these effective methods that can be deployed while creating a gas detector for our homes and work places.
The various types of sensors available for gas detectors are - Combustible Gas Sensors for Gas Detectors, Infra-Red Combustible Sensors for Gas Detectors, Catalytic Combustible Gas Sensors for Gas Detectors, Metallic Oxide Semiconductor (MOS) Combustible Gas Sensor for Gas Detectors, Electrochemical (Wet Chem) Toxic Sensors for Gas Detectors etc. These sensors generally search and are on a lookout for any contamination of explosive gases in the normal atmosphere. The gas detectors, thereafter, verify the presence of the hazardous gases by combusting a sample of gases collected from the surroundings inside the chambers. However, an oxygen requirement is critical for the operation of these types of Gas detectors. Moreover, vapor and water content in the air can affect the accuracy of these Gas detectors. The Infra-Red Sensors work with a mirror arrangement and measure the light adsorbed during refraction.
The Gas Detector
It is very crucial to realize the point of contact where the gases would be readily available to the sensor so that the sample collected faithfully replicates the actual mix of air in the contaminated atmosphere. The methods used for drawing the samples from the environment are draw, diffusion and a detachable remote diffusion sensor assembly. In the draw system, the sample from polluted air is acquired by a pump and a hollow tube transmits the same for gas detector detection. In the diffusion system, polluted air is absorbed directly by the Gas detector sensor. Electronic gas detectors usually deploy the diffusion sampling method. A detachable remote gas detector sensor is useful for large distances in a remote gas detector.
The most important aspect of any gas detector is the accuracy with which the gas detector is able to measure and display the status of polluted gases. This may entail frequent calibration of the gas detector. Calibration of gas detector is undertaken to make sure that when any contamination is detected by the gas detector, the level of contamination is accurately indicated. Any fault in the calibration of a gas detector can lead to disastrous consequences in case the gas detector detects the contamination and still doesn’t raise the alarm as the levels detected are below the threshold. These electronic LP Gas detectors detect gas leaks from both the front and back surfaces and release a visual as well audio warning signal indicating any leakage.
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