Analysis of Common Faults of Combustible Gas Detector

The common faults of stationary gas detectors are mainly caused by improper use of the user, lack of understanding of the detector performance, improper equipment selection, failure of the user to perform according to the specification, and inadequate maintenance. The following mainly analyzes the cause of the user's failure using the flammable gas detector, and at the same time, it proposes how to properly use the flammable gas detector to minimize the occurrence of the gas alarm.

First, the user installs the air-conditioning and heating equipment close to the flammable gas detector during the use of the gas detector by the user of the improper gas alarm. When the air-conditioning and heating equipment is used, if the cold and warm air flows directly Combustible gas alarms may cause errors in the change of the resistivity of the platinum gas alarm of the flammable gas alarm. Therefore, the combustible gas alarm should be kept away from the air conditioners and heating equipment to avoid faults caused by improper installation positions. Users should also pay attention to electromagnetic interference during the use of flammable gas detectors. The installation position, installation angle, protective measures and system wiring of flammable gas alarms should be prevented from electromagnetic interference. There are three main ways that the electromagnetic environment affects combustible gas alarms: electromagnetic wave interference in the air, narrow pulse groups on the power supply and other input and output lines, and static electricity in the human body.

For example, when a flammable gas alarm is installed near an air conditioner, it will cause the detection of the system to be deviated; the distance between the detection circuit and power lines, lighting lines and other strong electric circuits is small, and without the protection against electromagnetic interference, the system will also generate detection deviations. . When using flammable gas detectors, users should pay attention to factors that may cause malfunctions, such as dust, high temperature, humidity, and rain. When an exhaust fan needs to be installed in a field where a combustible gas alarm is installed, if the exhaust fan is disposed adjacent to a flammable gas detector, the leaked combustible gas will not be able to fully diffuse into the vicinity of the combustible gas alarm, resulting in inability to detect it in time. Yi Yi fighter.

In addition, users should also pay attention to the setting of flammable gas detectors in explosion-proof places. For example, a class A factory that emits flammable gas should use explosion-proof flammable gas alarms. The explosion-proof rating should not be lower than the corresponding explosion-proof requirements of the current specification. Users should also take precautions to avoid high temperature, high humidity, steam and fumes when using flammable gas detectors. Do not place objects or hang objects on the detector. The installed flammable gas detector cannot move the device anywhere. The user uses a combustible gas alarm as much as possible to use a sensor probe replaceable product for ease of use.

Second, the construction process is not standardized. Non-standard construction procedures can cause flammable gas detectors to detect failures during use. If the flammable gas detector is not located in the vicinity of the flammable gas where the device is liable to leak, or is installed adjacent to the exhaust fan during installation, the leaked combustible gas cannot fully diffuse into the vicinity of the flammable gas detector, so that the leakage danger cannot be ignited in time. Gas detector detection. For residential flammable gas detectors should be installed near the gas pipelines and cooking appliances in the kitchen. When the households use natural gas, the ceiling of the gas detector ceiling is installed within 300mm from the ceiling; when the resident uses liquefied petroleum gas, gas The detector should be installed within 300mm from the ground. If the flammable gas detector is not grounded reliably, electromagnetic interference cannot be eliminated, which will affect the voltage and cause faults with inaccurate detection data. Therefore, the flammable gas detector should be reliably grounded during construction. Flammable gas alarms and wiring terminals are set up to be vulnerable to collisions or ingress of water, resulting in open circuit or short circuit of electrical appliances. Welding must be done with non-corrosive fluxes, otherwise joints will erode off or increase line resistance, affecting normal detection. Do not drop or drop the detector on the ground. After the completion of construction, commissioning should be carried out to ensure that the combustible gas alarm is in normal operation.

Third, the maintenance of combustible gas detectors must detect the combustible gas concentration and must communicate the detectors to the testing environment. Therefore, it is unavoidable that various polluting gases and accumulated dust in the environment enter the detector. The damage of working conditions is objective. The working environment of flammable gas detectors is rather harsh. Many of them are installed outdoors. Poorly maintained maintenance will cause flammable gas detectors to detect errors or not. Therefore, regular cleaning and maintenance of flammable gas detectors is an important task to prevent malfunctions. Grounding should be regularly tested. Grounding cannot meet standard requirements or is not grounded at all. This can also make flammable gas detectors susceptible to electromagnetic interference and cause failures. Prevent component aging. From the reliability considerations, at the same time, practice has also proved that the flammable gas detector service period of more than 10 years of the system caused by component aging tends to increase, so the service period exceeds the use of the requirements, should be promptly replaced.