What are the factors that must be considered when selecting a toxic gas alarm?
Toxic gas alarm, used to detect toxic gases in the atmosphere, with concentration expressed in ppm (parts per million) and oxygen expressed in profit or loss (% VOL). The use of industrial grade and highly reliable electrochemical or infrared sensors ensures their high stability and maintenance free characteristics, reflecting the level of high-tech development.
The selection of a toxic gas alarm should consider the following factors:
1. Accuracy is the basic standard for measuring the quality of a gas detector. If the type and concentration of the detected gas cannot be accurately displayed, it indicates that the quality and detection of the instrument are not up to standard. In the current market, composite gas detectors often have the problem of cross interference in gas detection channels, which can affect accuracy. Therefore, before selecting an instrument, it is necessary to consult the manufacturer for relevant interference issues;
2. Examining the functionality of the instrument, whether it is good or not, mainly depends on its completeness, such as data transmission, fall alarm, expiration reminder, and other functions, which greatly improve safety;
3. Observe whether the response speed is fast or not. When detecting data, if the value exceeds the limit, the situation is very urgent
Selection, Common Mistakes, and Precautions for Gas Detectors
The reason why gas detectors cannot be used or damaged is that quality factors are only a part of choosing ordinary manufacturers, most of which are caused by improper selection and use.
Acceptance error: Using high concentration gas for testing Case: After the customer installed a combustible gas detector on site, they used a lighter to test whether the detector was working properly. After the ventilation test, the detector alarms but cannot be reset to zero. After normal use and detection of sensor damage, all sensors will be returned to the factory to pay the replacement fee.
Analysis: Many customers prefer to use high concentration gas for testing during acceptance. This method is very imprecise and can easily cause instrument damage. The detection range of the combustible gas detector is 0-100% LEL, with a lower explosive limit (methane is 0-5% vol), and the lighter gas is high-purity butane, which far exceeds the detection range. The range of combustible gas detectors.
When using lighter gases for testing, the sensor will be subjected to 2 to 3 or higher impacts, and the chemical activity of the sensing element will decay or deactivate in advance, resulting in a decrease in detection accuracy. The platinum wire was burned and the sensor was scrapped. It should be noted that manufacturers cannot guarantee sensor failures caused by high concentration gas impacts and require replacement at their own expense.
Analysis: Most combustible gas detectors on the market use the principle of catalytic combustion. The principle of catalytic combustion is to use catalytic energy to generate low-temperature flameless combustion on catalytic components, and the heat of combustion increases the temperature of the components.
