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1. Application Notes
Once the formaldehyde gas alarm has been fixed in place, the location of the formaldehyde gas alarm is not easily changed. The following points should be considered in the application.
(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 less 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 locations where there is a large leakage of toxic gases, a detection 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 locations with hydrogen leaks, the detector should be installed on the plane above the leak.
(7) 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 places where toxic gases can easily accumulate, special attention should be paid to the setting of safety monitoring points.
(8) For open toxic gas diffusion and escape environments, if there is a lack of good ventilation conditions, it is easy to make the toxic gas content in the air close to or reach the lower explosion 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 formaldehyde gas alarm (1) The alarm probe is mainly a detection element that comes into contact with the combustion gas sensor. The platinum wire coil is coated with alumina and a binder to form a sphere. The outer surface is accompanied by platinum, palladium, and other rare substances. metal. Therefore, be careful when installing to avoid damaging the probe.
(2) The installation height of the alarm should generally be 160-170cm, so that maintenance personnel can carry out routine maintenance.
(3) The alarm is a safety instrument, sound and light display function, and it should be installed in the place where the staff can easily see and hear, so as to eliminate the hidden trouble in time.
(4) There must be no strong electromagnetic fields (such as high-power motors and transformers) that affect the operation of the instrument around the alarm.
(5) The density of the gas to be measured is different, and 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.
Formaldehyde gas alarm use and installation precautions
Formaldehyde gas alarm consists of detector and alarm control host, widely used in petroleum, gas, chemical, oil depot and other toxic gases in the petrochemical industry, to detect indoor and outdoor hazardous locations leak, is to ensure the 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 sends 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.