Handheld Gas Monitor
Handheld Gas Monitor, as the name suggests, is a handheld gas analyzer, its main purpose is to quickly detect the air gas content composition (concentration). Handheld Gas Monitor appearance of ergonomic design, one-handed grip, widely used in factory exhaust inspection, air pollution detection, scientific research and experimental gas analysis, and restricted space Environmental surveys, and other scenarios.
How to use
A Handheld Gas Monitor is easy to use, with just one key to start, without any chemical reagents, you can real-time detection of gas concentration in the air, when the detection of environmental gas concentration reaches the set safety alarm value, it will automatically sound and light alarm, to remind the staff to dispose of the site environmental working conditions information.
Sampling Methods
Handheld Gas Monitor common sampling method to distinguish between diffusion, pump suction, and other three types, many partners are also asked to choose which one is good.
First of all, the handheld diffusion gas machine detector through the natural flow of gas to detect, when the gas is into the detector of the gas chamber, the instrument is automatically sensed, and real-time feedback monitoring values; diffusion sampling is suitable for use in the field environment is more open place to use.
Handheld pump suction gas detector by the built-in vacuum pump to detect the sampling, relying on the suction of the gas pump will be quickly sucked into the gas sensor gas chamber part, in order to achieve the gas detection work. Handheld pump suction gas detector is suitable for use in limited space, and narrow places, such as sewers, urban corridors, coal mines, and other scenes.
Detection range
Handheld Gas Monitor common detection range units are PPM, PPB, LEL, VOL, mg/m3, ug/m3, g/m3, g/l, mol/mol, mol/mol, and so on, how to go to the selection range?
In fact, the general look at the user’s own needs, if the routine measurement of gas concentration purposes, the handheld gas detector is recommended to choose the PPM range, such as 0-100PPM.
To measure gas micro-content or residual use, it is recommended to choose the PPB range, such as 0-1PPB.
To measure the lower explosive limit of combustible gases, the handheld detector should choose the LEL range, for example, 0-100% LEL.
Measure the high concentration of gas (oxygen, helium, argon), handheld recommended selection of VOL range, such as 0-100% VOL.
Handheld gas detector mg/m3, ug/m3, g/l these range units will rarely be used, special industries will be used.
Technical Principle
Handheld Gas Monitor common detection principles distinguish catalytic combustion, semiconductor, electrochemical, infrared, PID, laser, heat conduction, optical waveguide, etc., in the selection of the type of attention should not be chaotic to buy Oh, gas detector technology principles are different for the detection of gases as well as the functional characteristics of the differences. Handheld gas detectors do not know how to select the technical principles of friends, you can refer to the principle of the following selection instructions!
1. Catalytic combustion principle
A catalytic combustion handheld gas detector is suitable for measuring most combustible gases, such as hydrogen, carbon monoxide, methane, ethane, propane, butane, ethylene, propylene, butylene, acetylene, propargyl, butyne, hydrogen sulfide, phosphine, and other gases.
Advantages: Catalytic combustion gas detector has good output signal linearity, reliable index, and other non-combustible gases without cross-interference and other characteristics.
2. Semiconductor principle
A semiconductor handheld gas detector is suitable for measuring combustible gases, such as methane, ethane, propane, butane, alcohol, formaldehyde, carbon monoxide, carbon dioxide, ethylene, acetylene, vinyl chloride, styrene, propylene, and other gases.
Advantages: semiconductor gas detector principle of low cost, generally suitable for civilian gas detection needs.
3. Electrochemical principle
Electrochemical handheld gas detectors are suitable for measuring toxic gases, such as hydrogen sulfide, carbon monoxide, oxygen, sulfur dioxide, phosphine, ammonia, nitrogen dioxide, hydrogen cyanide, chlorine, chlorine dioxide, ozone, and other gases.
Advantages: electrochemical gas detector power consumption, linearity and repeatability, long life and good selectivity, and high sensitivity, etc., is now almost widely used in the field of laboratory gas analysis.
4. Infrared principle
A handheld infrared gas detector is suitable for measuring most combustible toxic and harmful gases, such as methane, carbon dioxide, nitrogen dioxide, carbon monoxide, sulfur dioxide, ammonia, ethanol, oxygen, benzene, and other gases.
Advantages: The infrared handheld gas detector with a long service life (5 years life), high sensitivity, good stability, and no toxicity, to the environmental temperature and humidity of the interference, and is small, and not dependent on oxygen and other characteristics.
5. PID principle
PID handheld gas detector is suitable for measuring volatile gases, such as TOVC, VOC, formaldehyde, benzene, xylene, ammonia, olefins, aromatic hydrocarbons, acetone, arsenic, and other gases.
Advantages: The photoionization PID gas detector has high sensitivity, and it can measure VOC at the ppb level, with fast response, high detection accuracy, and long service life.
6. Heat transfer principle
A handheld thermal conductivity gas detector is suitable for measuring flammable and explosive gases, such as high concentrations of methane, hydrogen, acetylene, propane, helium, phosgene, argon, laughing gas, and other gases.
Advantages: thermal conductivity handheld gas detector is generally widely used to measure flammable and explosive gases, or also can be applied to measure some individual toxic and hazardous gases, the advantages of a large detection range, the highest concentration of detectable gases of up to 100% VOL, the advantages of the second has a high degree of stability and reliability, good stability, long service life, there is no easy to occur the problem of aging.
7. Optical waveguide principle
A handheld optical waveguide gas detector is suitable for measuring toxic gases, such as nitric oxide, nitrogen dioxide, ozone, hydrogen sulfide, ammonia, carbon monoxide, sulfur dioxide, trimethylamine, chlorine, hydrogen chloride, hydrogen chloride, and other gases.
Advantages: Optical waveguide gas detector with high precision, stability, anti-interference ability, resolution, etc., can real-time PPM-level gas molecules in the air to capture, and real-time feedback monitoring values. The only drawback is that the cost of the product will be relatively high, and may not be much for the application of various industries.
8. Laser principle
Handheld laser gas detectors are suitable for combustible gases, such as methane, ethane, hydrogen, ammonia, and so on.
Advantages: laser gas detector anti-interference ability, not subject to the site temperature and humidity of the interference, can be in high humidity and -40 to +70 ℃ environment under normal use. Strong environmental adaptability, suitable for harsh environments, thin oxygen or even no oxygen can also be normal detection (methane) combustible gases.
What gases can Handheld Gas Monitor measure?
Handheld gas detectors’ conventional default detection of gas is methane, oxygen, hydrogen sulfide, carbon monoxide, and other four gas indicators. Therefore, also called 4 Gas Detector, in addition, the handheld gas detector can detect thousands of combustible, toxic, and harmful gases, such as methane, ethylene, methanol, carbon disulfide, ethylenediamine, benzene, ethanolamine, vinyl acetate, ethylamine, cyclohexylamine, formic acid, methanol, carbon monoxide, nitrogen dioxide, sulfur dioxide, ammonia, acetylene eyes, dimethylamine, naphthalene, toluene, phosphine, acrolein, Formaldehyde, iodine, chlorine, hydrogen fluoride, acetaldehyde, hydrogen sulfide, nitric oxide, etc.
Scope of application
1. Applicable to industrial occasions: such as petroleum and petrochemical, chemical plants, smelting plants, iron and steel plants, coal plants, thermal power plants, pharmaceutical research, production workshops, etc..
2. Suitable for environmental monitoring industry: such as sewage treatment, boiler room, garbage treatment plant, tunnel construction, oil pipeline, and environmental air quality monitoring.
3. Applicable to scientific research and security industry: such as college research, building construction, fire alarm, aerospace, safety monitoring, and protection.
4. Applicable to limited space occasions: underground tunnels, energy storage tanks, sewers, underground coal mines, ship cabins, and so on.
