Analysis and countermeasures for user failures of combustible gas detectors
(1) Improper use by users
When using the detector, users install air conditioning and heating equipment close to the combustible gas detector. When using air conditioning and heating equipment, if the cold or warm air flows directly through the combustible gas alarm, flammable gas may occur. The resistivity of the platinum wire of the alarm changes and errors occur. Therefore, the combustible gas alarm should be kept away from air conditioning and heating equipment to avoid malfunction caused by improper setting position. Users should also pay attention to preventing electromagnetic interference when using flammable gas detectors. The installation location, installation angle, protective measures and system wiring of combustible gas alarms should prevent electromagnetic interference. There are three main ways that the electromagnetic environment affects combustible gas alarms: airborne electromagnetic wave interference, narrow pulse groups on power supplies and other input and output lines, and human body static electricity. For example, when a combustible gas alarm is installed close to an air conditioner, it will cause a deviation in the system's detection; if the distance between the detection line and strong current lines such as power lines and lighting lines is small, and no electromagnetic interference prevention measures are taken, the system will also have a detection deviation. . When using the flammable gas detector, users should pay attention to factors that may easily cause malfunctions, such as dust, high temperature, humidity, rain, etc. When an exhaust fan is required to be installed in a site where a combustible gas alarm is installed, if the exhaust fan is installed adjacent to a combustible gas detector, the leaked combustible gas will not be able to fully diffuse to the vicinity of the combustible gas alarm, causing timely detection. Yi missed the opportunity to fight. In addition, users should also pay attention to the setting 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 level should not be lower than the corresponding explosion-proof level requirements of the current regulations. Users should also pay attention to avoid places where high temperature, high humidity, steam, and oil fumes can reach when using flammable gas detectors. Do not place or hang objects on the detector. The installed flammable gas detector cannot be moved arbitrarily. Users who use combustible gas alarms should try to choose products with replaceable sensor probes for ease of use.
(2) Irregular construction process
Irregularities in the construction process will cause flammable gas detectors to detect faults during use. If the flammable gas detector is not located near the equipment that is prone to leaking flammable gas, or is installed adjacent to the exhaust fan, the leaked combustible gas cannot fully diffuse to the vicinity of the flammable gas detector, thereby preventing the leakage from being flammable in time. Sexual gas detector detection. For residential combustible gas detectors, they should be installed near the gas pipes and stoves in the kitchen. When the household uses natural gas, the gas detector should be installed on the ceiling within 300mm of the ceiling; when the household uses liquefied petroleum gas, the gas detector should be installed on the ceiling. The detector should be installed within 300mm from the ground. If the flammable gas detector is not reliably grounded and cannot eliminate electromagnetic interference, it will inevitably affect the voltage and cause inaccurate detection data. Therefore, the flammable gas detector should be reliably grounded during construction. Combustible gas detectors and wiring terminals are installed in places prone to collision or water intrusion, causing electrical circuit breakage or short circuit. Welding must use non-corrosive flux, otherwise the joints will be corroded and disengaged or the circuit resistance will increase, affecting normal detection. Do not drop or drop the detector to the ground. After construction is completed, debugging should be carried out to ensure that the combustible gas alarm is in normal working condition.
(3) Maintenance
To detect combustible gas information, a combustible gas detector must communicate with the detection environment. Therefore, it is inevitable that various polluting gases and dust in the environment will enter the detector, which will adversely 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. Improper maintenance will lead to errors in the detection of flammable gas alarms or no detection. Therefore, regular cleaning and maintenance of flammable gas detectors is an important task to prevent malfunctions.
Grounding should be checked regularly. If the grounding does not meet the standard requirements or is not grounded at all, the flammable gas detector will be susceptible to electromagnetic interference and cause malfunctions. Prevent components from aging. From the perspective of reliability, practice has proven that systems with combustible gas detectors that have a service life of more than 10 years tend to have more failures caused by component aging. Therefore, if the service life exceeds the requirements for use, they should be replaced in time.
