This site2018-12-24 14:27:31
Tohnichi can recommend a handheld gas detector!
Product overview of handheld gas detectors
High detection speed, long-distance measurement in the danger zone, and maintenance personnel safety.
For continuous monitoring of volatile organic gases (VOC), a fixed PID gas monitor is designed. It is an explosion-proof organic gas detector using a photoelectric ion smart sensor and a fixed installation method.
The invention can store 1000 sets of alarm records, and each group of alarm information includes the first report value, the maximum value and the alarm time of the alarm record.
The detector can not only replace similar sensors, but also replace sensor modules with different gas types and different measurement ranges, and can automatically complete operation and identification. Catalytic combustion sensors and electrochemical sensors can be replaced at will.
The system uses a 32-bit embedded microprocessor as the control unit, and uses a high-performance catalytic gas sensor or a high-precision imported electrochemical sensor as the detection detector, with high sensitivity and fast response speed.
The wall-mounted combustible gas detector (hereinafter referred to as the detector) is a fixed instrument capable of continuously detecting the concentration of combustible gas in the working environment.
Intelligent digital display gas detector adopts reliable double cavity design, magnetic rod adjustment or infrared remote control.
The toxic, harmful, flammable, and explosive gas concentrations monitored on site can be converted into standard 4-20mA analog signals and standard RS 485 MODBUS digital signal outputs.
Multi-point monitoring alarm controller is used to detect the content of flammable gas or liquid vapor explosion within the lower limit of explosion in the air. It can collect multiple detection probes and control multiple points at the same time. The system uses a microprocessor as the control unit and a high-performance catalytic gas sensor as the detection sensor. It has high sensitivity and fast response.
Compact and lightweight: This walkie-talkie is the size of a pocket, small and light, and easy to carry.
Intelligent modular gas detector is a fixed continuous measuring instrument for the concentration of combustible gas in the working environment.
The gas alarm adopts a wall-mounted structure, strictly complies with the national standard GB16808-2008 "Technical requirements and test methods for flammable gas alarm controllers", and passed the inspection of the National Fire Safety Electronic Product Quality Supervision and Inspection Center.
The gas alarm controller is a multi-channel gas alarm monitoring device developed by the company. Each controller can connect 4 ~ 20 mA meters. The controller adopts a modular design and has strong expandability, which can adapt to system configuration requirements of various sizes.
The appearance of the instrument is made of special high-strength ABS engineering plastic, with stylish design, beautiful appearance, good feel and durability. This product has the advantages of fast response speed, good stability, high sensitivity, small size, light weight, and easy to carry.
Point gas detectors are widely used in the detection of flammable and toxic gas leakage concentrations in industrial environments.
It has the functions of setting and adjusting the magnetic bar without opening the cover, remote setting and adjustment of the host computer or controller, the display of the bright backlit digital liquid crystal display, secondary sound and light alarm or dry contact alarm output and other functions. Is a completely international standard intelligent gas detector.
Brief introduction of handheld gas detector industry
This article mainly describes the software and hardware design of the flammable gas monitoring alarm. In recent years, with the rapid development of natural gas, gas separation types, cut-off series, centralized monitoring systems, and anti-poison alarm protection systems have appeared. At the same time, the gas detection technology and computer technology are combined to achieve intelligence and multi-function. For example, Japan's Figaro company introduced a low-power gas alarm for detecting (~ 10) * 10-6 hydrogen sulfide, the US IST company introduced a gas alarm with a lifespan of more than 10 years, and the US's first alarm company introduced a bionic ( Photochemical reaction) low power CO gas alarm. While these gases bring convenience to people's energy, production and life, they are also toxic and flammable chemicals, and they also bury the hidden dangers of fire, poisoning and explosion for users of gas burners. Generally speaking, it is mainly an analysis of the barriers to entry and the degree of competition in the industry. With the development of the petrochemical industry, the types and applications of flammable, explosive, and toxic gases are increasing. The research report focuses on the analysis of the supply and demand status of the toluene alarm market in China, the industry competition pattern and trends, the regional supply and demand status of the toluene alarm market, the segmentation status of the toluene alarm market, and the development trend of benchmark enterprises and markets. The flammable gas alarm can be installed in the air of non-mine working environment to measure and alarm the flammable gas concentration under the lower explosion limit.
How to choose a handheld gas detector
This article stipulates that when establishing a gas alarm control system, a central gas alarm control system consisting of point-type combustible gas detectors, alarm controllers, etc. should be selected for commercial and industrial users. However, for commercial outlets with an area of less than 80 tons, such as small restaurants, an independent gas alarm control system can be established to reduce the burden on users. Some of these new instruments are equipped with a vibration alarm accessory to avoid audible alarms in noisy environments. Computer chips installed to record peaks, STEL (15-hour short-term exposure level), and TWA (average weight at 8:00)-provide specific guidance for workers' health and safety. However, in the early days, semiconductor sensors were also used, but now due to higher requirements, few manufacturers use semiconductor sensors. The gas detector cannot be used in an environment where the concentration of combustible gas is above the lower explosive limit. Because the detection element used in the catalytic combustion detector is a carrier catalytically active element, when the concentration of the combustible gas is higher than the lower explosive limit, the detection element in the detector will be burned. When using natural gas, artificial gas or a gas with a relative density of less than 1, the installation distance between the detector and the center of the release source should not be greater than 8m and should not be less than 1m. Integrated fixed gas alarm: same as portable instruments, installed on the scene, 220 V AC power, continuous automatic detection and alarm, mostly for diffusion sampling. According to the results of market research, large industrial enterprises and small chemical plants have developed and implemented chemical gas detection systems. However, the frequency and efficiency of manual detection are not ideal and cannot be monitored in real time. This requires a professional flammable (toxic) gas detection alarm device, rather than manual detection work. According to the on-site airflow direction and wind direction and other specific factors, when a large amount of leakage occurs, determine the leakage direction of the combustible gas. For the open-air flammable gas diffusion and escape environment, if there is no good ventilation, it is easy to make the flammable gas content in a certain part of the air close to or reach a lower explosive concentration. These are security monitoring points that cannot be ignored.
Hand-held gas detectors implement standards
Article 10 The indication and alarm part of the flammable gas detection alarm shall be installed in the place monitored by humans to facilitate operation and maintenance and avoid being affected by vibration and high temperature.
JTJ237-1999 Code for fire protection design of petroleum loading docks
JB 5230-1991 General technical conditions of physiological recorder
In the absence of oxygen, corrosion, etc., infrared gas physical inspection (detector) should be used;
"Combustible gas detectors" Part 3: Portable combustible gas detectors "Technical requirements and test methods for household combustible gas alarms", measuring range 0-100% LEL
Failure analysis of handheld gas detector
In order to ensure the accuracy of the instrument measurement, the instrument must be calibrated at any time, and the instrument must be calibrated regularly. Also called parallel method. Put a good gas alarm on the chip you want to see, maybe a good component (resistance capacitor, diode, transistor, etc.). And see the devices in parallel, stick to touch, use this method if the problem is open or bad contact inside the device. The standard configuration of the product does not include a backup power supply. If the customer is not equipped with power, it is only powered by the main power supply. After the power supply is delayed, a fault alarm and a charging fault will be issued. The fault indicator can be pressed this time. There is a so-called "hand-pressed" toxic gas alarm in the fault, which closes the force insertion part, plug and valve seat, and then starts the test to eliminate the problem. The fault indicator and the loudspeaker continue to emit sound. Possible cause: the detector's wiring is wrong; the detector is broken, and the handling method is correct first time, reconnect. For domestic flammable gas detectors should be installed near the kitchen gas pipelines and stoves. When natural gas is used in households, the ceiling of the gas detector should be installed within 300 mm; when households use liquefied petroleum gas, install gas within 300 mm on the ground detector. In addition, users should also pay attention to the installation of combustible gas detectors in explosion-proof places. For example, A-type plants that emit flammable gas should use explosion-proof flammable gas alarms, and the explosion-proof level should not be lower than the corresponding explosion-proof level requirements of the current code. If the flammable gas detector is not located near the flammable gas leaking device or installed near the exhaust fan, the leaked flammable gas cannot spread sufficiently near the flammable gas detector, so the flammable gas detector cannot detect the leakage risk in a timely manner. Non-standard construction process will cause the flammable gas detector to find faults during use.