Combustible gas alarm installation selection point and installation attention
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The flammable gas alarm is also known as a fixed gas detector. It is mainly composed of an alarm device and a detector. It is installed in a fixed area to monitor the concentration of flammable gas in the range. To use a flammable gas alarm, you must first learn to install it properly and install it in a suitable location. The following small series teaches everyone.
Combustible gas alarm
Combustible gas alarm installation point:
(1) Identify the possible leak points of the devices to be monitored, analyze their leakage pressure, direction and other factors, and draw the probe position distribution map, which is divided into three grades according to the severity of the leak.
(2) Determine the leakage direction of the combustible gas when a large amount of leakage occurs, depending on the specific direction of the airflow direction and wind direction of the site.
(3) According to the density of the leaking gas (greater or smaller than the air), combined with the trend of air flow, integrated into a three-dimensional flow trend diagram of leakage, and an initial set point scheme is made at the downstream position of the flow.
(4) Study whether the leakage state of the leak point is micro-leak or spray. If it is a micro leak, set the position of the point close to the leak point. If it is a jet leak, it should be slightly away from the leak. Based on these conditions, a final set-up plan is drawn up. In this way, the quantity and variety that need to be purchased can be estimated.
(5) For places where there is a large flammable gas leak, according to the relevant regulations, a detection point should be set for each distance of 10-20m. For small, non-continuously operating pump rooms that are unattended, attention should be paid to the possibility of flammable gas leakage. Generally, a detector should be installed at the downwind.
(6) For places with hydrogen leaks, install the detector on the plane above the leak point.
(7) For media with a gas density greater than air, the detector should be mounted on a lower surface below the leak point and pay attention to the surrounding environment. Special attention should be paid to the setting of safety monitoring points for places where flammable gas is easily accumulated.
(8) For the open flammable gas diffusion and escape environment, if there is no good ventilation condition, it is easy to make the flammable gas content in the air of a certain part close to or reach the lower explosion limit concentration. These are safety monitoring points that cannot be ignored. .
In addition, most accidents are caused by incorrect installation and verification methods. Therefore, you need to pay attention to the precautions for the installation of flammable gas alarms:
(1) There must be no strong electromagnetic fields (such as high-power motors and transformers) that affect the operation of the instrument.
(2) The alarm device is a safety instrument with sound and light display function. It should be installed in a place that is easy for the staff to see and hear, so as to eliminate hidden dangers in time.
(3) The installation height of the alarm should generally be 160-170cm, so that maintenance personnel can carry out routine maintenance.
(4) The alarm probe is mainly a detecting component that contacts the combustion gas sensor. The platinum wire coil is coated with alumina and a binder to form a spherical shape, and the outer surface thereof is provided with a rare metal such as platinum or palladium. Therefore, be careful when installing to avoid breaking the probe.
(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 and the direction is downward; otherwise, the probe should be installed 30cm away from the ground, and the direction is upward.
(6) The installation of the open-air probe can be selected according to the density of the gas to be measured. It is important to note that the probe should be installed on the downwind side.
(7) The connection cable of the alarm circuit should be protected by a protective sleeve. Add a metal hose at the wiring of the probe, and pay attention to the explosion-proof level of the factory.
(8) After installation and commissioning, be sure to install a breathable waterproof cover to prevent rain from entering the damaged probe.
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