Selection and use of portable gas detectors
With the development of the economy and the improvement of people's living standards, people are increasingly concerned about health and safety issues. In addition to paying attention to the safety of daily life, food, housing, and transportation, the hazards of gases are also gradually being taken seriously.
Especially for industrial toxic and harmful gases, many enterprises have taken various protective measures to protect against toxic gases. For example, employees working in toxic gas environments need to wear corresponding gas masks and protective clothing, install fixed gas detectors at equipment interfaces and valves, and regularly use portable gas detectors to detect and record the concentration of harmful gases in the air of specific areas.
The selection of portable gas detectors should be based on specific circumstances, and suitable detection equipment should be chosen. When using, the following issues should also be noted:
1. Attention should be paid to the maintenance of the portable gas detector. Like other equipment, regular maintenance should be carried out, and it should be calibrated and tested irregularly. It should be stored in a lower temperature environment to extend its service life.
2. Attention should be paid to the different service lives of portable gas detectors. When purchasing, it is important to inquire about the service life of the instrument and use it within its warranty period. Some companies, in order to save costs, use a detector for several years without replacing it, and gas detection is only for show, which can ultimately harm others and oneself.
3. We should pay attention to the interference of gas on instrument detection. When detecting gas leaks, we usually use a single portable gas detector to detect a specific gas. However, in the detection environment, there is often more than just one gas, so we need to pay attention to whether other gases will interfere with the instrument's detection and make the detection results inaccurate.
4. Attention should be paid to the concentration range detected by the portable gas detector. Before detection, in addition to estimating the types of toxic and harmful gases based on experience, it is also necessary to roughly estimate the gas concentration. The portable gas detector is used to set the alarm value for detection. When the gas concentration exceeds the detection range of the instrument, the detector should be turned off. Prolonged detection of the portable gas detector in an over range state can cause serious damage to the instrument, leading to inaccurate detection or direct scrapping.
The principle of the detection part is that when the concentration of the combustible gas being measured exceeds the limit value, the amplified bridge circuit outputs a voltage and the circuit detection set voltage. Through the voltage comparator, the square wave generator outputs a set of square wave signals to control the sound and light detection circuit. The buzzer produces continuous sound, and the light-emitting diode flashes to emit a detection signal.
