Failure analysis and countermeasures for users using flammable gas detectors
(1) Improper use by users
When the user uses the detector, install the air conditioner and heating equipment close to the flammable gas detector. When using the air conditioner and heating equipment, if the cold and warm air flow directly blows through the flammable gas alarm, it may cause flammable gas. The resistivity of the platinum wire of the alarm changes and there is an error. Therefore, the flammable gas alarm should be kept away from air conditioners and heating equipment to avoid failure caused by improper setting. Users should also pay attention to anti-electromagnetic interference when using the flammable gas detector. The installation position, installation angle, protective measures and system wiring of the combustible gas alarm should prevent electromagnetic interference. There are three main ways in which the electromagnetic environment can affect combustible gas alarms: electromagnetic wave interference in the air, narrow pulse groups on power supplies and other input and output lines, and human body static electricity. For example, when the combustible gas alarm is installed close to the air conditioner, the detection deviation of the system will occur; the distance between the detection line and the power line, lighting line and other strong electric lines is small, and the system will also produce detection deviation without anti-electromagnetic interference measures . When using the flammable gas detector, users should pay attention to factors that may cause failures, such as: dust, high temperature, humidity, rain, etc. When an exhaust fan is required to be installed in the place where the combustible gas alarm is installed, if the exhaust fan is installed adjacent to the combustible gas detector, the leaked combustible gas will not be able to fully diffuse to the vicinity of the combustible gas alarm, resulting in failure to detect in time. Yi missed the opportunity. In addition, users should also pay attention to the installation of flammable gas detectors in explosion-proof places. For example, Class A factories that emit flammable gases should use explosion-proof flammable gas alarms, and their explosion-proof grades should not be lower than the corresponding explosion-proof grade requirements of the current regulations. Users should also pay attention to avoid places where high temperature, high humidity, steam, and oily smoke can reach when using the flammable gas detector. Do not place or hang objects on the detector. The installed flammable gas detector cannot move the position of the device arbitrarily. Users use combustible gas alarms as much as possible to choose products with replaceable sensor probes for ease of use.
(2) The construction process is not standardized
Irregularities in the construction process will cause the flammable gas detector to detect failures during use. If the combustible gas detector is not installed near the equipment that is prone to leaking combustible gas, or is installed adjacent to the exhaust fan during installation, the leaked combustible gas cannot be fully diffused to the vicinity of the Gas detector detection. The combustible gas detector in the residence should be installed near the gas pipeline and stove in the kitchen. The detector should be installed within 300mm from the ground. If the flammable gas detector is not reliably grounded and electromagnetic interference cannot be eliminated, the voltage will be affected and the detection data will be inaccurate. Therefore, the flammable gas detector should be reliably grounded during construction. The flammable gas detectors and terminals are installed in places that are prone to collision or water ingress, which may cause electrical circuit breaks or short circuits. Non-corrosive flux must be used for welding, otherwise the corrosion at the joint will separate or increase the line resistance, which will affect the normal detection. Do not drop or drop the detector on the ground. Debugging should be carried out after construction to ensure that the combustible gas alarm is in normal working condition.
(three), maintenance
In order to detect combustible gas information, the combustible gas detector must communicate with the detection environment. Therefore, it is unavoidable for various polluting gases and dust in the environment to enter the detector, which will affect the working conditions of the detector. Damage is an objective existence. The working environment of combustible gas detectors is relatively harsh, and many of them are installed outdoors. Poor maintenance will lead to errors or non-detection of combustible gas alarms. Therefore, regular cleaning and maintenance of combustible gas detectors is an important task to prevent failures.
The grounding should be checked regularly. If the grounding does not meet the standard requirements, or is not grounded at all, it will also make the flammable gas detector susceptible to electromagnetic interference and cause failure. Prevent components from aging. From the perspective of reliability, and practice has proved that the failures caused by component aging tend to increase in the system of flammable gas detectors with a service period of more than 10 years. Therefore, if the service period exceeds the requirements of the use regulations, it should be replaced in time.
