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Combustible gas detectors are detectors installed in industrial and civil buildings that respond to single or multiple combustible gas concentrations. The most frequently used flammable gas detectors are two types of catalytic flammable gas detectors and semi-conductor flammable gas detectors. The use of gas, natural gas, and liquefied gas in hotels, guesthouses, and family production rooms mainly uses semi-conductor flammable gas detectors, and catalytic flammable gas detectors are used in industrial sites that emit flammable gas and flammable vapors.
Catalytic flammable gas detectors measure the concentration of combustible gases using the change in resistance after the refractory metal platinum wire is heated. When the flammable gas enters the detector, an oxidation reaction (flaming combustion) is caused on the surface of the platinum wire. The heat generated by the flammable gas increases the temperature of the platinum wire, and the resistivity of the platinum wire changes, so when a high temperature is encountered, etc. When the temperature of the platinum wire changes, the resistivity of the platinum wire changes, and the detected data also changes.
The semiconductor type flammable gas detector measures the combustible gas concentration using the surface resistance change of the semiconductor. Semiconductor gas combustible gas detector with high sensitivity of the gas-sensitive semiconductor components, it encountered a combustible gas in the working state, the semiconductor resistance decreased, the decline in the concentration of flammable gas and a corresponding relationship.
Combustible gas detector consists of detection and detection of two parts, with detection and detection capabilities. The principle of the detection part of the flammable gas detector is that the sensor of the instrument adopts a detection element, a fixed resistance and a zeroing potentiometer to form a detection bridge. The bridge uses a platinum wire as the carrier to catalyze the element. After the power is applied, the temperature of the platinum wire rises to the operating temperature, and the air reaches the surface of the element by natural diffusion or other means. When there is no flammable gas in the air, the bridge output is zero. When the flammable gas is contained in the air and diffused on the detection element, flameless combustion occurs due to catalysis, so that the temperature of the detection element is increased and the resistance of the platinum wire is increased. The bridge circuit is out of balance and there is a voltage signal output. This voltage is proportional to the concentration of flammable gas. The signal is amplified and converted by analog to digital. The liquid display shows the concentration of flammable gas. The principle of the detection part is that when the measured flammable gas concentration exceeds the limit value, the amplified bridge output voltage and circuit detection set voltage, through the voltage comparator, a square wave generator outputs a square wave signal to control the sound, In the light detection circuit, a continuous sound occurs in the buzzer, and the light emitting diode emits light, and a detection signal is emitted. From the principle of flammable gas detectors, it can be seen that if electromagnetic interference affects the detection signal, data deviation will occur; if there is a collision or vibration, the device will be disconnected and the detection will fail; if the environment is too humid or the equipment enters water, it may also be Causes a short circuit in the flammable gas detector, or a change in the line resistance value, and a detection failure.
The common problems are as follows:
The user uses the improper user to install the air conditioner and heating device near the flammable gas detector during the use of the detector. When the air conditioner and the heating device are used, if the cold and warm air flows directly through the flammable gas alarm device, there will be It may cause errors in the resistivity of the platinum gas alarm of the flammable gas alarm. Therefore, the combustible gas alarm should be far away from the air conditioning and heating equipment, so as 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 spacing between the detection circuit and power lines, lighting lines and other strong electric circuits is small. Without the prevention of 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 the 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. Its explosion-proof rating should not be lower than the corresponding explosion-proof rating required by current regulations. Users should also pay attention to the use of flammable gas detectors to avoid high temperatures, high humidity, steam, and soot. Do not place objects or hang objects on the detector. The installed flammable gas detector cannot move the device anywhere. The user uses a flammable gas alarm as much as possible to use a sensor probe replaceable product for ease of use.
Non-standard construction process The non-standard construction process will cause flammable gas detectors to detect faults during use. If the flammable gas detector is not located in the vicinity of the flammable gas where the equipment 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 detectors and terminals are set up to be vulnerable to collisions or ingress of water, resulting in an open or short circuit in the electrical circuit. 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.
Proper maintenance grounding should be regularly tested. Grounding cannot meet standard requirements or is not grounded at all. It can also make flammable gas detectors susceptible to electromagnetic interference and cause problems. Prevent component aging. From the reliability considerations, at the same time, practice has proven 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.
The flammable gas detector must detect the flammable gas information and must communicate the detector with the detection environment. Therefore, it is unavoidable that various polluting gases and accumulated dust in the environment enter the detector, and its working conditions caused by the detector The damage is an objective reality. The flammable gas detector has a rather harsh working environment. Many of them are installed outdoors. Poorly maintained maintenance will result in the detection of flammable gas alarms with or without detection. Therefore, regular cleaning and maintenance of flammable gas detectors is an important task to prevent malfunctions.
Flammable gas detector performance and routine maintenance instructions
Tester performance: