Within the sensing element is a platinum wire coated with a mix of substances. This catalyses the oxidation of the gasses. A catalytic gas detector creates heat whenever a gas oxidises. The sensor converts the temperature change using a standard Wheatstone bridge-type circuit.
The MQ6 gas sensor has a high sensitivity to Propane, Butane and LPG, and response to Natural gas. The sensor could be used to detect different combustible gasses, especially Methane; it hasa lowcost and is suitable for different applications. The MQ-6 can detect gas concentrations anywhere from 200 to 10,000 ppm.
Catalytic and infrared sensors are able to detect combustible gases, and are more commonly used in everyday life. Catalytic sensors are triggered when a combustible gas touches a catalytic surface. A resistance change occurs due to heat and an alarm is set off.
false alarm may be caused by a few things including its proximity to fuel-burning appliances, exposure to humidity, or the low quality of the device itself.
While it's nothing to brag about, it is theoretically possible for farts to set off propane alarms. Some farts contain enough methane to register with propane alarms. The alarm, as it should, will then activate and likely create quite a scene. However, the conditions must be just right for this situation to occur.
Range of LPG/ PNG Gas leak detection is 0 to 100% LEL. These detectors are suitable in hazardous areas, specifically designed for detection of LPG / PNG group of gases.
Higher density gases such as propane and gasoline are heavier than air and will tend to collect near the floor. For these gases it is best to mount the sensor within inches of the floor. Lower density gases such as hydrogen or natural gas are lighter than air and will tend to collect near the ceiling.
The leakage of LPG is detected by a strong-smelling substance called ethyl mercaptan, which is added to the gas. The steps necessary to be taken if LPG leakage is detected are, Any substance that can cause burning should be moved away from the leakage.
Ethyl mercaptan or ethanethiol which is an organo-sulphur compound is added to the gas, which possesses that strong odor of rotten cabbages. The smell helps us to detect when there is a leak, which is very important for safety purposes.
Steps to take in case you detect a gas leak
Ensure that any item which is inflammable is extinguished immediately including switching off your gas stove. Simply switching off your gas stove won't suffice. You will have to switch off the LPG regulator and ensure the safety cap has been put on.
Now, officially however, all gas detectors must report accuracy specifications which are typically presented as "<5% F.S." on the specification sheet (see below example of our FD-90A series). F.S. stands for FULL SCALE, which refers to the range of gas concentration that the detector can measure.
The Combustible Gas Leak Detector Pen is extremely sensitive, with a detection range of 0 to 100% lower explosive limit. Its low alarm level is 20±5% and 50±10%, with the high alarm level being greater than 50±10%.
According to scientists at the National Institute for Occupational Safety and Health (NIOSH), direct reading instruments for gaseous exposure assessment should measure within ± 25% of the true concentration of the target analyte with 95% certainty.
Electrochemical: Highly sensitive electrochemical gas detectors measure toxic gases such as Carbon Monoxide. They work through sensing electrodes in the air, sending an electric current to sound the alarm.
You connect the canister and gas detector by the Tygon tubing. Once ready to begin a small amount of gas, but still enough to trigger the sensor, is blown through the tube. If the gas detector is working properly the bump gas will cause the alarm to go off. This lets you know the gas detector is working properly.
Portable gas detectors such as the Marine 4™ can be configured to detect any four gases, and display all of them simultaneously.
Despite their widespread usage, metal oxide gas sensors have several drawbacks, including limited selectivity for specific gases, response and recovery times measured in minutes or hours, and a significant effect of humidity on the sensor output.
The electrochemical principle of the gas detector
Disadvantages: short life, limited storage period, short life in extremely dry or high-concentration gas environment, non-specific type, easy to interference, and humidity affects accuracy.
LPG has a higher calorific value or energy content, so less gas is required to produce the same amount of heat. Another key difference is in the oxygen-to-gas ratio required for proper combustion. LPG requires an oxygen-to-gas ratio of approximately 25 to 1. Natural gas requires a ratio of around 10 to 1.
➢ LPG forms flammable mixtures with air in concentrations of between approximately 1.8% and 9.5%. It is a fire and explosion hazard if stored or used incorrectly.
Workplaces which use flammable substances (i.e. LPG) or high-pressure applications, like kitchens, laundries and boiler rooms are at risk for fire and explosion. The main hazards are gas leakage followed by ignition (when mixed with air it is highly flammable and potentially explosive).
Inhaling LPG vapor at high concentration even for a short time can cause fainting and/or death. Inhaling of LPG vapor can cause irritation in nose and throat, headache and nausea, vomiting, dizziness and loss of consciousness. LPG vapor can cause fainting and choking in closed or poorly ventilated environments.