What makes up a detector for flammable gas?
Nowadays, combustible gas detectors must be installed in places where gas, natural gas, and liquefied petroleum gas are used, such as restaurants, hotels, and home workshops. It is a detector that responds to the concentration of a single or multiple combustible gases, and can be widely used in occasions for portable and rapid detection of combustible gas concentrations, temperature and humidity measurement, and alarms for exceeding standards. However, although many friends know more about combustible gas detectors, they are still very unfamiliar with its specific components. So what are the components of the combustible gas detector?
1. Detection part
The principle of the detection part of the combustible gas detector is that the sensor of the instrument uses a detection element, a fixed resistor and a zero adjustment potentiometer to form a detection bridge. The bridge uses platinum wire as the carrier catalytic element. After electrification, the temperature of the platinum wire rises to the working temperature, and the air reaches the surface of the element by natural diffusion or other methods. When there is no flammable gas in the air, the output of the bridge is zero. When the air contains flammable gas and diffuses to the detection element, flameless combustion occurs due to catalytic action, which makes the temperature of the detection element rise and the resistance of the platinum wire increases. , so that the bridge is out of balance, so that there is a voltage signal output, the magnitude of this voltage is proportional to the concentration of flammable gas, the signal is amplified, converted from analog to digital, and the concentration of flammable gas is displayed through the liquid display.
2. Detection part
The principle of the detection part is that when the concentration of the measured flammable gas exceeds the limit value, the amplified bridge output voltage and the circuit detection set voltage, through the voltage comparator, the square wave generator outputs a set of square wave signals, control sound, In the light detection circuit, the buzzer produces continuous sound, and the light-emitting diode flashes to send out a detection signal. From the principle of the combustible gas detector, it can be seen that if electromagnetic interference occurs, the detection signal will be affected, and data deviation will occur; if there is a collision or vibration that causes the equipment to break, the detection will fail; if the environment is too humid or the equipment enters water, it may also cause The combustible gas detector has a short circuit, or the line resistance value changes, and a detection failure occurs.
In summary, it is the components of the combustible gas detector. However, due to the different types of combustible gas detectors, we should choose different combustible gas detectors when we apply them in different places. Semiconductor-type flammable gas detectors should be used in places where gas, natural gas, and liquefied petroleum gas are used, and catalytic-type flammable gas detectors should be used in industrial places that emit flammable gases and flammable vapors.
