(1) Identify potential leaks in the devices to be monitored, analyze factors such as leakage pressure and direction, and draw a distribution map of probe positions. Classify them into three levels based on the severity of the leaks: Level I, Level II, and Level III.
(2) Based on specific factors such as airflow direction and wind direction in the location, determine the direction of toxic gas leakage when a large amount of leakage occurs.
(3) Based on the density of the leaked gas (greater or less than air), combined with the trend of air flow, a three-dimensional flow trend chart of the leak is synthesized, and an initial setting plan is made at the downstream position of its flow.
(4) Study whether the leakage state is micro leakage or jet like. If it is a minor leak, the location of the point should be closer to the leak. If it is a jet leak, it should be kept slightly away from the leak. Based on these situations, develop the most comprehensive plan for the final location. In this way, the quantity and variety that need to be purchased can be estimated.
(5) For places with significant toxic gas leaks, according to relevant regulations, a detection point should be set up every 10-20m. For unmanned small and discontinuous pump rooms, attention should be paid to the possibility of toxic gas leakage, and a detector should generally be installed at the lower air outlet.

For locations with hydrogen gas leaks, detectors should be installed on a flat surface above the leak.
(7) For media with a gas density greater than air, the detector should be installed on a plane below the leakage point, and attention should be paid to the characteristics of the surrounding environment. Special attention should be paid to the setting of safety monitoring points in places where toxic gases are prone to accumulate.
(8) For open environments where toxic gases diffuse and escape, if there is a lack of good ventilation conditions, it is also easy for the toxic gas content in a certain part of the air to approach or reach the lower limit concentration. These are important safety monitoring points that cannot be ignored. According to the on-site analysis results, more than half of them are caused by incorrect installation and calibration. Therefore, it is necessary to introduce the precautions for correct installation and verification to reduce malfunctions.