Analysis of the principle and application method of the four-in-one gas detector
With the diversification of combustible gas detection instruments, other gas detectors, such as four-in-one gas detectors, have appeared widely on the market, and people's work and life safety have been prevented and guaranteed to a certain extent.
The 4-in-1 gas detector uses a special circuit that measures the detector current at two points. When combustible gas enters the circuit chamber, half of which is hot enough to ignite the gas, it contains a or combustion catalyst. As the gas burns, the thermal and power circuits through the current test area change. This change triggered the alarm device.
Hazards caused by toxic gas leaks in many industrial treatment plants including chemical, oil/gas, electric utilities, food and beverage, pharmaceutical, pulp/paper, sewage treatment; sources of leaks typically include pipes, valves, tanks, burners , refrigerators, separators, lighting systems, aeration tanks and other equipment.
Infrared combustible gas detectors work completely differently. As a result of the gas entering the test chamber, a beam is shot out. It actually goes to the gas, halfway into the gas at a receiver, and then back to the transmitter. The detector measures the intensity of two beams to determine the presence of flammable gases. When the beams are the same, all is well, but variations in the intensity of the beam on the air side can mean something is wrong.
When the 4-in-1 gas detector detects toxic gases, we must first pay attention to its inherent problems: according to the chemical stability of toxic gases, adjust the level and other characteristics at relatively high concentrations. Because they rely on the inactive pull of airflow, samples generally have slower response times. Calibration of 4-in-1 gas detectors is often difficult, requiring conversion of special accessories and spreading the mode of operation by the purpose of flow calibration. In addition, the equivalence of diffusion between the through-flows implied by monitoring and calibration is not always a good record.
Second, calibration can be more complicated if adjustments have to be made in the control panel while the gas is applied to the remote diffuse gas detector sensor head. In some applications interfering gases may be present. The sample extraction method allows chemical scrubbers to be placed upstream of the sensor to absorb interference. All gas sensors measure partial pressure while the ambient pressure sensor diffuses and actively draws the sensor sample to work at a slightly higher pressure. Therefore, the output sensitivity of the sample stretch sensor is usually higher than that of the diffusion sensor. This could be an important regulatory level at low levels of toxic gases. But how many toxic gases have the necessary properties.
A combustible gas detector is a device that senses harmful gases and alerts people to the presence of danger. There are two main methods for detecting combustible gases: controlled combustion and infrared techniques. Each of these methods has its own advantages and disadvantages, although infrared methods are generally safe overall. In addition to the four-in-one gas detector, there are also various equipment such as voc detector and ozone detector.
