How to use gas detector correctly
Combustible gas alarms are composed of detectors and alarms. They are widely used in petrochemical industries where combustible gases exist, such as petroleum, gas, chemicals, and oil depots. They are used to detect leaks in indoor and outdoor dangerous places and are important to ensure production and personal safety. instrument. When combustible gas exists in the measured site, the detector converts the gas signal into a voltage signal or current signal and transmits it to the alarm instrument. The instrument displays the percentage concentration value of the lower explosion limit of the combustible gas. When the concentration of combustible gas exceeds the alarm set value, an audible and visual alarm signal will occur, and the personnel on duty will take safety measures in time to avoid explosion accidents. Once the fixed-point installation of the combustible gas alarm is in place, its position is not easy to change. Based on the work experience accumulated over the years, the following points should be considered in specific applications when using gas detectors correctly.
(1) Understand the possible leak points of the device to be monitored, analyze their leak pressure, direction and other factors, and draw a probe location distribution map, which is divided into three levels: I, II and III according to the severity of the leak.
(2) Based on specific factors such as the airflow direction and wind direction of the location, determine the direction of flammable gas leakage when a large leakage occurs.
(3) Based on the density of the leaked gas (greater or smaller than air), combined with the air flow trend, a three-dimensional flow trend diagram of the leakage is synthesized, and an initial setting point plan is made at the downstream position of its flow.
(4) Study whether the leakage state at the leakage point is micro-leakage or spray-like. If it is a slight leak, the setting point should be closer to the leak point. If it is a spray leak, move slightly away from the leak point. Based on these conditions, a final site setting plan is drawn up. In this way, the quantity and variety to be purchased can be estimated.
(5) For places with large flammable gas leaks, a detection point should be set up every 10-20m apart according to relevant regulations. For small, unattended and discontinuously operating pump rooms, attention needs to be paid to the possibility of flammable gas leakage, and a detector should generally be installed at the downdraft.
(6) For places with hydrogen leakage, the detector should be installed on the plane above the leakage point.
(7) For media with gas density greater than air, the detector should be installed on a plane below the leak 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 flammable gases are prone to accumulate.
(8) For open combustible gas diffusion and escape environments, if there is a lack of good ventilation conditions, it is easy for the combustible gas content in the air in a certain part to approach or reach the lower explosion limit concentration. These are safety monitoring points that cannot be ignored. .
