The difference between a gas analyzer and a gas alarm
A chemical plant performs dynamic analysis before the hydrogen production equipment is overhauled. When the safety chief uses a flammable gas detection and alarm device to measure the hydrogen content in the low-temperature hydrogen production equipment, the instrument displays a value of <4% (in fact, several measurements are performed. Between 3.0% and 3.8% H2. At this time, the safety chief approved the fire. When the welder squadron ignited the torch, a violent explosion occurred, and the low-temperature hydrogen production equipment collapsed. Seven people Death, eight people were injured.
There are many reasons for the occurrence of this serious accident. It has nothing to do with this article. However, it can be seen from the above that the correct understanding and use of the gas detection and alarm device is a problem worthy of discussion. This paper only discusses this for the reader's reference.
The function and limitations of the gas detection alarm
1. Function
The gas detection alarm device is a simple and convenient small instrumentation. It is available in both pocket and fixed type. It can be installed with different types of probes (sensors) to measure different types of gases. Because of its small size, sensitive reaction, fast detection, convenient carrying and low price, it is used in many production departments to detect the concentration of various combustible gases and toxic gases.
2. Limitations
The application of the gas detection alarm device should mainly be carried out in two aspects: qualitative analysis and semi-quantitative analysis, that is, if the user only needs to know whether there is flammable gas (or hydrogen, oxygen, etc.) and the concentration of the combustible gas is large or small, It can provide you with rough basic information for your reference. But if the user sees the data they display as accurate data, then people will be misled and may have serious consequences. It should be noted that the gas detection alarm is not a gas analysis instrument, and there are great differences in performance and application. There should be a clear understanding of this.
The difference between gas analyzer and gas detection alarm
1. Different instrument structure
The gas detection and alarm device has a relatively simple structure and includes only a probe (sensor) and a sensor signal conversion circuit portion. The gas analyzer not only has a probe (sensor) inside but also a complete gas system that introduces the sample gas into the instrument and leads to a complete pneumatic system that is vented or recycled.
2. Different detection methods
The gas detection alarm is directly exposed to the air to be tested or the sample atmosphere for detection. In the gas analyzer, the gas to be measured (sample gas) is introduced into the instrument through a special method for measurement, and then the outside of the instrument is vented.
3. Different control methods for measuring conditions
The gas detection and alarm device does not have the adjustment and control part of the technical conditions of the sample gas process, and it also directly tests without considering the environmental conditions in which the sample gas exists.
The complete set of pneumatic system and external supporting equipment supported by the gas analyzer constitute a relatively complete chemical process. The gas analyzer internally adjusts the working conditions of the sample gas to achieve normal and stable operation of the sensor. Purpose, this is the guarantee that the gas analyzer can obtain accurate measurement data.
4. Different methods of operation to complete the measurement process
When the gas detection alarm is applied, the instrument only needs to place the instrument in the atmosphere to be tested, and the instrument can display the value. The gas analyzer must carefully introduce the sample gas into the instrument, and then strictly adjust the technical conditions, such as temperature, pressure, flow, etc., only when the operator adjusts the instrument until a stable chemical process is achieved. Accurate measurement of data. The data obtained before this time is incorrect and must be discarded.
5. In the detection process, the way to eliminate interference factors is different.
The gas detection alarm device measures the sensor directly in a large ambient atmosphere. The structure design of the instrument and the actual use detection process do not consider the factors of interference measurement in the large ambient atmosphere, and do not have the ability to eliminate various interference factors. Designing ability. Gas analyzers must fully consider the internal and external factors affecting the measurement during design selection and use testing, and must be carefully excluded one by one to ensure the accuracy and authenticity of the test data. Otherwise, an influential factor is improperly ignored, which is unacceptable and unacceptable for testing.
6. The accuracy of the data is different
The gas detection alarm can only provide qualitative analysis results and relatively quantitative quantitative analysis data. The data displayed by this instrument cannot withstand the scrutiny and cannot be analyzed for error (because only when the analysis data deviates from the true value, the "error" can be mentioned. Therefore, it is impossible to determine (determine) important process improvement adjustment measures as accurate analytical data. The gas analyzer is a strict measuring instrument that can provide very accurate data during quantitative analysis. This data can be used as a basis for gas production and safe production improvement and improvement. It can be used to guide and produce. Management, quality management and business management. Even this data can be used as an important basis for judicial criminal investigation work, and it can be used to make a lawsuit to determine the boundaries between right and wrong.
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| Product Name | Tof LiDAR Sensor |
| Model Number | IT02S-65-A/IT02S-65-B/IT03M-650 |
| Measuring Range (without Reflection) | 0.1-12m/0.1-10m/0.1-15m(90% reflectivity) |
| Place of Origin | China |
| Accuracy | 2cm~4cm/5cm |
| Blind Area | 10cm |
| Resolution | 1cm |
| Measuring Unit | centimetre |
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| Laser Type | 650nm, <1mW |
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| Weight | About 4g/10g |
| Voltage | 2.7V~+3.6V |
| Electrical Level | TTL/CMOS |
| High Frequency | 100hz |
| Operating Temperature | 0-40 ℃ (32-104 ℉ ) |
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