In the process of industrial use of gas, if the gas is in an incomplete combustion state, gas leakage, etc., the gas will cause poisoning or cause fire accidents, a direct threat to the safety of personnel. Therefore, it is necessary to install an industrial gas alarm, which can effectively detect gas leakage and issue an alarm in time to protect the safety of factories, workshops and employees. It can prevent serious fire and explosion accidents, thereby reducing the huge losses caused by accidents. Combustible gas alarm is also called gas leakage detection alarm instrument. When combustible gas leaks in industrial environment and the gas alarm detects that the gas concentration reaches the critical value set by the explosion or poisoning alarm, the gas alarm will send out an alarm signal to remind the staff to take safety measures. The gas alarm is equivalent to the automatic fire extinguisher, which can be installed to drive the exhaust, cut off the power supply, spray and other systems to prevent explosions, fires, and poisoning accidents, thereby ensuring safe production. Often used in chemical plants, oil, gas stations, steel plants and other places prone to flammable gas leakage.

When the concentration of combustible gas exceeds the lower limit of explosion, it will explode and cause injury in case of fire (lighter, electrical switch, static electricity, etc.). What is the lower limit of explosion, that is, the lowest concentration of fire explosion in the air, the alarm concentration is set at the lower limit of explosion1/4The following. For example, the lower explosive limit of methane (the main component of natural gas) is50000ppmThe lower explosive limit of propane (the main component of liquefied gas) is20000ppmHydrogen (main component of coal-to-gas) is40000ppm。

At present, the common industrial gas includes natural gas, liquefied petroleum gas, aromatic gas, coal gas and so on. These industrial gases have high combustion efficiency and can meet the energy required for a large number of industrial production. At the same time, industrial gases often containVOC(volatile organic compounds),VOCIt is a kind of volatile compound at room temperature, mainly composed of carbon, hydrogen and a small amount of oxygen, nitrogen, sulfur and other elements, with high vapor pressure and low boiling point. In the process of industrial production,VOCIt is usually produced by volatile solvents, reaction intermediates, raw materials and waste in petrochemical, chemical, pharmaceutical, paint, printing, coating and other processes. TheseVOCAfter being discharged into the atmosphere, it is easy to have complex chemical reactions with other pollutants such as nitrogen oxides to form ozone precursors such as ozone and secondary organic aerosols, which may cause harm to the environment and human health. CommonVOCFor example, benzene, toluene, xylene, and trichloroethylene are all toxic, and there are many other organic compounds in the industry that may also be harmful to human health. Therefore, for industrial gasesVOCIt is necessary to pay enough attention and take effective control measures to reduce its impact on the environment and human health.

Here, let's recommend the catalytic combustion sensorTGS6812-D00，TGS6814-D01and semiconductor gas sensorsTGS2620。TGS6812-D00，TGS6814-D01Can be used as combustible gas detection,TGS2620Used as an organic solvent detection, this is a sensor developed by Figaro in Japan. Figaro Sensor is a world-renowned Japanese company integrating R & D, sales, and after-sales technical support of gas sensors. The company was established in the 1960 s and has been focusing on the R & D and production of gas sensors. It has a deep technical accumulation and a very good reputation. good. So...TGS6812-D00andTGS6814-D01What's the difference?

Features: Features:

* Linear output * High sensitivity to methane
* Long service life * Linear relationship between gas concentration and sensor output
* Low sensitivity to alcohol * Low sensitivity to alcohol
* High sensitivity to hydrogen, methane and LP * High sensitivity to hydrogen, methane and LP

TGS6812 is a catalytic combustion type combustible gas sensor, which can detect hydrogen at 100%LEL level. This sensor has the characteristics of high accuracy, good durability and stability, fast response and linear output. It can not only monitor hydrogen, but also detect methane and LP gas. This is an excellent solution for leak detection when a stationary fuel cell uses hydrogen as a combustible gas. The cap of the TGS6812-D00 has an adsorbent and has very low cross sensitivity to organic vapors. In addition, the sensor is more resistant to silicon compounds and is more adaptable to harsh environments.

TGS6814 is a catalytic combustion gas sensor, which is an upgraded version of TGS6812. It can detect methane gas at the lower explosive limit of 100%LEL level and also detect H2. This sensor not only has excellent durability and fast response ability, but also has linear output and high stability of output.

The TGS6814 cap has a specially designed filter layer, which makes it very low cross-sensitivity to organic vapors. In addition, the sensor is more resistant to silicon compounds and is more adaptable to harsh environments.

The following is the specific specifications of the two sensors. It can be seen that the heating voltage of the two sensors is different, TGS6814 compared with the TGS6812 heating power consumption is smaller, the zero drift is smaller, and the output sensitivity is more stable.

      TGS2620Description

The sensitive element consists of an integrated heater and a metal oxide semiconductor on an alumina substrate. When the gas to be detected in the air is present, the higher the concentration of the gas, the higher the conductivity of the sensor. Using a simple circuit, the change in conductivity can be converted into a signal output corresponding to the gas concentration. The Japanese figaro alcohol sensor TGS2620 has a high sensitivity to organic solvents and other volatile gases. Suitable for organic solventsGas detector. Due to the small size of the sensitive element, the heater current TGS2620 by the alcohol sensor only needs 42mA, and the housing is packaged with standard TO-5 metal.

Features:

      * Low power consumption

      * High sensitivity to ethanol and organic solvents

      * Long service life and low cost

      * Simple application circuit

      * small volume