The main gas detectors are: portable gas detectors, fixed gas detectors, four-in-one gas detectors, gas detectors, gas detectors, ammonia detectors, carbon dioxide detectors, methane detectors, and large-scale discounts. Welcome new and old customers. To consult procurement.

How to choose the right detector.

For all kinds of different production occasions and testing requirements, the choice of a suitable gas detector is a must for every person engaged in safety and health work. In the case of industrial hygiene testing and health surveys, it is very convenient to use instruments with data logging and statistical calculations and functions that can be connected to a computer.
1) Confirm the type and concentration range of the gas to be tested:
The type of gas encountered in each production department is different. All possible situations should be considered when selecting a gas detector.
a, If methane and other less toxic alkanes are the most common, the LEL detector is undoubtedly the most suitable. This is not only because the LEL detector has a simple principle and a wide application, but it also has the characteristics of convenient maintenance and calibration. B
b. If there are toxic gases such as carbon monoxide and hydrogen sulfide, it is preferred to select a specific gas detector to ensure worker safety.
c, if more organic toxic and harmful gases, considering the lower concentration of people may cause poisoning, such as aromatic hydrocarbons, halogenated hydrocarbons, ammonia (amines), ethers, alcohols, fats, etc., should choose the previous chapter The photoionization detector should never be used with the LEL detector as this can cause casualties.
If the gas type covers the above types of gases, choosing a compound gas detector may achieve a multiplier effect.
2) Determine the use occasion:
The type of gas detector is different depending on the industrial environment.
A) Fixed gas detector:
This is the use of more detectors on industrial plants and in production processes. It can be installed at a specific inspection point to detect specific gas leaks. The fixed detector is generally two-piece type. The detection head consisting of sensor and transmission is installed in the inspection site. The secondary instrument consisting of circuit, power supply and display alarm device is installed in a safe place for easy monitoring. Its detection principle is more suitable in the process and technology for the continuous and long-term stability required for fixed detection. They are also selected according to the type and concentration of the gas on site, and care should be taken to install them where the specific gas is most likely to leak, such as selecting the most effective height for sensor installation based on the specific gravity of the gas.
B) Portable gas detector:
Because portable instruments are easy to operate and compact, they can be carried to different production sites. The electrochemical detectors are powered by alkaline batteries and can be used continuously for 1000 hours. The new LEL detectors, PID and composite instruments use rechargeable batteries (some have The use of non-memory nickel-metal hydride or lithium-ion batteries makes them generally work for nearly 12 hours in a row, so the use of such instruments in various factories and health departments is becoming more widespread.
If it is open, such as an open work shop using such instruments as a safety alarm, you can use a diffused gas detector that you wear, because it can display the concentration of toxic and harmful gases in the field continuously, in real time and accurately. Some of these new instruments are also equipped with vibration alarm accessories - to avoid audible alarms in noisy environments, and to install computer chips to record peaks, STEL (15 minutes short-term exposure level) and TWA (8-hour statistics) Weighted average) - Provides specific guidance for worker health and safety.
If it is entering a confined space, such as a reaction tank, storage tank or container, sewer or other underground pipeline, underground facilities, agricultural closed granary, railway tanker, shipping cargo bay, tunnel, etc., it must be tested before personnel enters. And to test outside the confined space. In this case, you must select a multi-gas detector with a built-in sampling pump. Because the gas distribution and gas type of different parts (upper, middle and lower) in the confined space are very different. For example, in general, the proportion of combustible gases is relatively light, and most of them are distributed in the upper part of the confined space; the specific gravity of carbon monoxide and air is similar, generally distributed in the middle of the confined space; and the heavier gases such as hydrogen sulfide are present in the confined space. The lower part of the space. At the same time, the oxygen concentration is also one of the types that must be detected. In addition, a detector that can detect organic gases is also needed if one considers the volatilization and leakage of possible organic matter in the tank. Therefore, a complete closed space gas detector should have a built-in pumping function - so that it can be non-contact, sub-site detection; with multi-gas detection function - to detect different spatial distribution of dangerous gases, including inorganic Gas and organic gases; with oxygen detection function - to prevent hypoxia or oxygen enrichment; portable device that is small in size and does not affect workers' work. Only in this way can the absolute safety of the personnel entering the confined space be guaranteed.
In addition, after entering the confined space, the gas components therein should be continuously tested to avoid changes in the concentration of volatile organic compounds or other toxic and harmful gases caused by personnel entering, sudden leakage, and temperature changes.
If used for emergency, leak detection and inspection, pumping, short response time, high sensitivity and high resolution instruments should be used to make it easy to determine the location of the leak.
In the case of industrial hygiene testing and health surveys, it is very convenient to use instruments with data logging and statistical calculations and functions that can be connected to a computer.


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