How many scientific alarm points are set for combu

2022-06-22
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How many scientific alarm points are set for combustible gas alarm

combustible substances (combustible gas, steam and dust) and air (or oxygen) must be uniformly mixed within a certain concentration range to form premixed gas, which will explode only when encountering fire source. This concentration range is called explosion limit, or explosion concentration limit. For example, the explosion limit of carbon monoxide mixed with air is 12.5%vol - 74%vol

the lowest and highest concentrations of flammable mixtures that can explode are respectively called lower explosion limit and upper explosion limit, which are sometimes called lower ignition limit and upper ignition limit. The lower explosion limit of CO in the above example is 12.5%vol, i.e. 100%lel, and the upper explosion limit is 74%vol. No explosion or fire when it is lower than the lower explosion limit; It will not explode above the upper limit of explosion, but it can burn. This is due to the insufficient concentration of combustibles in the former and the cooling effect of excess air, which prevents the spread of flame; The latter is due to the lack of air, resulting in the flame can not spread

selection of combustible gas alarm point

why is the range of combustible gas alarm 0-100%lel? The lower explosion limit of each combustible gas is different. For the convenience of reading, the display data of combustible gas alarm is designed to be 100 parts, and the air volume ratio is converted into the lower explosion limit unit. The reading set at the alarm point of most combustible gas alarms is between 0-100%lel, Its increment is a unit change value of 1%lel, because the standard uses the percentage of LEL to formulate the hazard index. The general alarm limit is 10% LEL or 25% LEL, and the set value on many instruments is set to 25%lel. However, whenever the reading exceeds 25% LEL, it means that there may be a danger of combustion or abnormal conditions. 25% is the alarm value specified in GB in the national standard code for design of combustible gas and toxic gas detection and alarm in petrochemical industry. Urban gas is 20% LEL. These setting points are more scientific. 15%, 17% and 30% are not very scientific. It must be 0% LEL in an absolutely safe environment

isweek Industrial Mining Co., Ltd. specializes in providing civil and industrial grade combustible gas sensors that can be applied to combustible gas alarms. The details are as follows:

the combustible gas sensor tgs2611 has high sensitivity to methane gas. Because of its low sensitivity to volatile alcohol (a common interfering gas in the living environment), it is an ideal sensor for household gas leakage alarms. Due to the small size of the sensitive element, the heater current of the combustible gas sensor tgs2611 only needs 56ma, and the detection part of the sensor is stored in the standard TO-5 metal package

the combustible gas sensor tgs2611-c00 is not only small in size, but also extremely responsive. It is a good choice for gas leakage detector. The combustible gas sensor tgs2611-e00 is equipped with a filter cover which can eliminate the influence of alcohol and other interfering gases, and has the sensitivity of high selectivity for methane gas. It is especially suitable for the household environment with complex atmosphere and strict requirements. It is an ideal sensing experimental machine for household gas leakage detector. The organizational structure of the manufacturing enterprise will produce some positive changes

the combustible gas sensor tgs2610 has high sensitivity to propane and butane and is a good LPG monitor. Due to its low sensitivity to volatile alcohol (common interfering gas in living environment), it is an ideal sensor for gas leakage alarm. Due to the small size of the sensitive element, the heater current of tgs2610 only needs 56ma, and the detection part of the sensor is stored in the standard TO-5 metal package

tgs2610-c00 is not only small in size, but also very responsive. It is a good choice for gas leakage detector. Tgs2610-d00 is equipped with a filter cover which can eliminate the influence of interfering gases such as alcohol, and has the sensitivity of high selectivity for LP gas. It is especially suitable for detecting appliances in the complex atmosphere and strict domestic environment. It is an ideal sensor for domestic gas leakage detector

Catalytic Combustion Methane Sensor (CH4 Sensor) the ch-a3 catalytic combustion gas sensor uses the thermal effect principle of catalytic combustion and consists of a measuring bridge composed of a detection element and a compensation element. When encountering combustible gas, the combustible gas burns under the action of the detection element carrier surface and the catalyst, the carrier temperature increases, and the platinum wire resistance inside it increases accordingly, Thus, the balance bridge loses balance and outputs an electrical signal proportional to the concentration of combustible gas

catalytic combustion combustible gas sensor tgs6812 is a catalytic combustion gas sensor, which can detect hydrogen at 100%lel level. This sensor has the characteristics of high precision, good durability and stability, fast response and linear output. It can not only monitor hydrogen, but also detect methane and LP gas. This is a very excellent scheme for leakage detection of fixed fuel cells when hydrogen is used as combustible gas. Tgs6812-d00 has adsorbent in the cap, and its cross sensitivity to organic steam is very low. In addition, the sensor has better resistance to silicon compounds and is more adaptable to evil. Therefore, the impact damage resistance of the product is 10 points necessary for poor environment

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