What are the common pitfalls in selecting industrial flammable gas detectors?
Misconceptions in the selection of combustible gas detectors
1. Misuse of catalytic combustion principle detector: Catalytic combustion sensors are not suitable for detecting long-chain alkanes (such as high flash point gasoline, diesel, aromatic hydrocarbons, etc.) and hydrocarbon compounds containing benzene ring structures (such as benzene, toluene, xylene, etc.). Due to the stable carbon chain structure, these substances are difficult to detect through catalytic combustion, and long-term use can easily lead to the phenomenon of "carbon deposition", resulting in a decrease in detection sensitivity or even complete failure.
2. Neglecting the calibration and calibration of the detector: Combustible gas detectors must be calibrated and calibrated regularly to ensure the accuracy of their detection results. The calibration cycle should generally not exceed one year, and for enterprises with specialized metrology departments, it is recommended to shorten it to no more than three months. If this step is ignored, the detector may not be able to issue accurate alarms in a timely manner, thereby delaying the best time for safe disposal.
3. Using a high concentration gas testing detector: Testing the combustible gas detector with high concentration gases such as lighter gas can cause the sensor to experience impacts far beyond normal concentrations. This behavior can lead to early attenuation or deactivation of the chemical activity of the sensing element, reducing detection accuracy and sensitivity; Heavy damage may burn off the platinum wire inside the sensor, resulting in the sensor being completely scrapped. It is worth noting that such man-made damages are usually not covered by the manufacturer's warranty.
Refer to the selection guide
1. Clearly define the type and concentration range of gases to be detected
For different detection gases, it is necessary to choose detection instruments with corresponding detection principles and technologies. For example, catalytic combustion or infrared gas detectors should be selected for combustible gases of light hydrocarbons; Heavy hydrocarbon vapors are more suitable for photoionization detectors; For hydrogen detection, catalytic combustion type, electrochemical type, or heat conduction type detectors can be used.
2. Choose the appropriate sensor type
Select the appropriate sensor type based on the type of gas to be tested and the detection requirements. For example, for organic toxic and harmful gases, a PID photoionization detector can be selected; If multiple gases need to be detected simultaneously, you can choose Yiyuntian's composite gas detector.
3. Consider the usage environment and conditions
When choosing a detector, it is necessary to fully consider its usage environment and conditions, including temperature, humidity, pressure, dust, corrosive gases, and other factors. The detector should be able to adapt to the actual environment, for example, in harsh environments, a detector with high protection level and good stability should be selected.
4. Determine the usage method
Determine the usage mode of the detector based on specific usage scenarios. For example, when entering a confined space for testing, a multi gas detector with a built-in sampling pump should be selected to achieve non-contact, segmented detection of hazardous gases with different spatial distributions.
5. Pay attention to the performance indicators of the detector
When choosing a detector, attention should be paid to its performance indicators, such as detection accuracy, response time, stability, repeatability, etc. The higher the detection accuracy and the shorter the response time of the detector, the more timely it can detect gas leaks or abnormal concentrations.
6. Consider other factors
In addition to the above factors, the portability, battery life, and display mode of the detector also need to be considered. The portable detector should be lightweight and easy to carry, with a long battery life, and the display should be intuitive and easy to understand, making it convenient for users to quickly read the detection results.
