One of the combustible gas alarm manufacturers
1. Shenzhen Sofortone Industrial Company Limited, Shenzhen Sofortone was founded in 1995, is the domestic production of combustible gas alarms, one of the professional manufacturers, the company has a number of the earliest domestic rich practice of production and technical personnel and sales teams.
2. Dongying Pengyuan Petroleum Equipment Co., Ltd, since its establishment in 2005, thanks to the support and love of the majority of new and old customers, now the service team continues to grow, the service field continues to extend.
3.Jinan HengYao Electronic Technology Co., Ltd, specializing in toxic and hazardous gases, combustible gas detection equipment research and development, production, sales of high-tech enterprises. Since its establishment in 2004, the company is committed to providing customers with products, services and system solutions to meet their application safety needs.
Two, combustible gas alarm purchase
Combustible gas alarm is a gas leak detection and alarm instruments, often used in chemical plants, oil, gas stations, steel mills and other places with gas leaks. So how can you choose to excellent performance of the combustible gas alarm? The following by the Noonan Xiaobao with you to share combustible gas alarm selection of the four tips!
1, to see whether the combustible gas detector has stability. This is a factor that must be considered, the smaller the value of the zero offset and full amplitude offset, the better, all gas detectors in addition to other gases other than oxygen will produce more or less disturbing reactions, the most frequent is the detection of hydrogen sulfide electrochemical sensors, so as a daily user of home life we must be familiar with the possible existence of toxic gases in the family.
2, to see whether the combustible gas detector is easy to recognize. Numerical or pointer type gas detector. Generally speaking, the numerical type has the advantage of being easy to read and less misjudgment. Whether the display area is large enough, with background illumination and large fonts, so that it is easy to read and understand. Whether the alarm is loud enough to be recognized by background noise. Generally, 90dB(A) or more is suitable. Whether the flashing light can be recognized from various angles. Can the signal be displayed continuously in response to changes in the measured gas concentration, and then stopped after confirmation or countermeasures have been taken?
3, to see whether the reliability of the combustible gas detector is good. The longer the life of the sensor, the better, generally speaking, the average life of the combustible gas detector for 2 - 5 years, the smaller the error value, the better. Accuracy and his precision is even more with the increase in the number of years of use, the product warranty is generally 2 years. Sensor whether to use smart sensor technology.
4, to see whether the use of combustible gas detector is convenient.
Three, the application of precautions
Combustible gas alarm fixed-point installation once in place, its position is not easy to change. According to the work experience accumulated over the years, the following points should be considered for specific applications.
(1) find out what possible leakage points of the device to be monitored, analyze their leakage pressure, direction and other factors, and draw a distribution map of the probe location, according to the severity of the leakage is divided into Ⅰ, Ⅱ, Ⅲ three levels.
(2) According to the direction of airflow, wind direction and other specific factors in the place where it is located, determine the direction of combustible gas leakage when a large number of leaks occur.
(3) According to the density of the leaking gas (greater or less than air), combined with the trend of air flow, integrated into the three-dimensional flow trend of the leakage map, and make the initial setup program in the downstream position of its flow.
(4) Study the leakage state of the leakage point is a micro-leakage or jet. If it is a micro-leakage, the location of the set point should be closer to the leakage point. If it is a jet leak, then slightly away from the leak. Combining these conditions, the final setup plan is formulated. In this way, the number and variety of purchases can be estimated.
(5) for the existence of large combustible gas leakage places, according to the relevant provisions of every 10-20m apart should be set up a detection point. For unmanned small and discontinuous operation of the pump room, need to pay attention to the possibility of combustible gas leakage, generally should be installed in the downwind a detector.
(6) for hydrogen leaks, the detector should be installed in the leak above the plane.
(7) for the medium of gas density greater than air, the detector should be installed in the lower plane below the leak point, and pay attention to the characteristics of the surrounding environment. For places where combustible gases tend to accumulate should pay special attention to the setting of the safety monitoring point.
(8) for open combustible gas diffusion escape environment, if the lack of good ventilation, but also very easy to make a part of the air in the combustible gas content close to or reach the lower limit of the explosion concentration, these are not to be ignored safety monitoring point.
According to the results of the analysis of on-site accidents, more than half of them are caused by incorrect installation and calibration. Therefore, it is necessary to introduce the correct installation and calibration precautions to reduce the failure.
Four, combustible gas alarm installation precautions
(1) alarm around the instrument can not have an impact on the work of strong electromagnetic fields (such as high-power motors, transformers).
(2) The alarm is a safety instrument with sound and light display function, and should be installed in the place where the staff can easily see and hear in order to eliminate the hidden danger in time.
(3)The installation height of the alarm should be 160-170cm in general, so as to facilitate the maintenance personnel to carry out routine maintenance.
(4)Alarm probe is mainly contact combustion gas sensor detection element, by the platinum wire coil on the package of alumina and adhesive composed of spherical, and its outer surface attached to platinum, palladium and other rare metals. Therefore, must be careful when installing, to avoid dropping the probe.
(5) The density of the gas being measured is different, the installation position of the indoor probe should also be different. When the density of the measured gas is less than that of the air, the probe should be installed 30cm away from the roof, in the downward direction; on the contrary, the probe should be installed 30cm away from the ground, in the upward direction.
(6) open probe installation can be based on the density of the gas to be measured and select the installation height, special attention should be paid to the probe should be installed in the downwind side.
(7) The connection cable of the alarm circuit should be protected with a sleeve, and it is better to add a metal hose at the wiring place of the probe, and pay attention to be consistent with the explosion-proof level of the factory.
(8) After installation and commissioning, be sure to install a breathable waterproof cover, so as not to rain into the damage to the probe.
Five, combustible gas alarm calibration considerations
(1) in principle, to be used by the metrological certification and the gas detected to match the standard sample gas. The same measured medium selected by the standard sample gas is different, the alarm point is different.
(2) Before calibration, the surrounding environment of the probe should be free of combustible gases. If there are combustible gases, remove the rain cover, fill a certain amount of clean air, and then continuously through the sample gas to ensure the accuracy of the calibration.
(3) When the measured gas is a hydrocarbon mixture, isobutane is the first choice for sample gas, followed by propane.
(4) for non-hydrocarbon mixtures or the lower explosive limit concentration of gas combustion heat generated by the difference between more
hydrocarbon mixtures, as a last resort, butane, isobutane, propane and other readily available and stable single-component fuel as a sample gas. At this time must be based on certain detection signal conversion relationship to adjust the range of the alarm.
Six, combustible gas alarm use and maintenance methods
Combustible gas alarms are more types and models, but the basic circuit principle is the same, so its use and maintenance methods are similar. Now the use and maintenance methods are introduced as follows:
(1)The service life of the detection element and compensation element is usually 3-5 years. In the use of reasonable conditions and proper maintenance conditions, can extend its service life.
(2) For alarms with test buttons, the test button should be pressed once a week to check whether the alarm system is normal. The zero point and range of the alarm should be checked and calibrated once every 2 months.
(3) The detector should be checked frequently for accidental water ingress. Detector breathable cover in the instrument testing, should be removed to clean to prevent clogging.
(4)The detector is explosion-proof equipment and shall not be used beyond the specified range. Detector shall not be used in the sulfur-containing occasions. Detector should try to use in the combustible gas concentration below the lower limit of explosion conditions, otherwise, there is a risk of burnt components.
(5) Hot-wire semiconductor-type detectors shall not be used under conditions of oxygen deficiency. Do not use a large number of available gas directly to the probe.