The poisonous and harmful gas detector consists of a detector and an alarm control host. It is widely used in petroleum, gas, chemical, and oil depots where there are toxic gases in the petrochemical industry. It is used to detect leaks in hazardous locations indoors and outdoors, ensuring production and personal safety. Important instrument. When there is a toxic gas in the measured location, the detector converts the gas signal into a voltage signal or a current signal and transmits it to the alarm meter. The instrument displays the percentage concentration of the toxic gas explosion lower limit. When the concentration of toxic gas exceeds the alarm set value, an audible and visual alarm signal is generated. The on-duty personnel take safety measures in time to avoid the occurrence of explosive explosion.
1. Precautions for application When the fixed installation of the poisonous and harmful gas detector is in place, the position of the detector is not easily changed. The following points should be considered when applying the device.
(1) Find out which possible leakage points of the devices to be monitored, analyze their leakage pressure, direction and other factors, and draw the distribution map of the probes, and classify them into three grades I, II and III according to the severity of the leakage.
(2) Determine the direction of leakage of toxic gas when there is a large amount of leakage, based on specific factors such as the airflow direction and direction of the location.
(3) According to the density of leaked gas (greater than or smaller than air), combined with the trend of air flow, integrate the three-dimensional flow chart of leakage and make an initial set-point scheme at the downstream position of the flow.
(4) The leakage status of the leaking point was studied as microleakage or jetting. If it is a microleakage, set the position of the point to be near the leak. If it is a spray-like leak, keep it slightly away from the leak. Combine these conditions and draw up a final plan. In this way, the number and type of purchases needed can be estimated.
(5) For sites where there is a large leakage of toxic gases, a test point should be set at a distance of 10-20 m per relevant regulations. For unattended, small, non-continuous pumping stations, attention should be paid to the possibility of toxic gas leakage, and a detector should generally be installed at the downtake.
(6) For media with a gas density greater than air, the detector should be installed on the lower surface below the leak point and pay attention to the surrounding environment. For sites where toxic gases can easily accumulate, special attention should be paid to the setting of safety monitoring points.
(7) For an open toxic gas diffusion and escape environment, if there is no good ventilation, it is easy to make the toxic gas content in the air close to or reach the lower explosive concentration in a certain area. These are all non-negligible safety monitoring points. . According to the results of field accident analysis, more than half of them were caused by incorrect installation and calibration. Therefore, it is necessary to introduce the correct installation and calibration precautions to reduce the failure.
2. Precautions for the installation of poisonous and harmful gas detectors (1) The installation height should generally be 160-170cm, so that maintenance personnel can carry out routine maintenance.
(2) The poisonous and harmful gas detector is a safety instrument with sound and light display function. It should be installed in the place where the staff can easily see and hear, so as to eliminate the hidden trouble in time.
(3) There must be no strong electromagnetic fields (such as high-power motors and transformers) that affect the instrument work.
(4) The density of the gas to be measured is different. The installation position of the indoor probe should also be different. When the measured gas density is less than the air density, the probe should be installed 30cm away from the roof, down direction; otherwise, the probe should be installed 30cm away from the ground, upward direction.
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