Gas quantitative leak detector is a high-precision professional detection device mainly used for accurately measuring the leakage concentration of specific gases
(especially sulfur hexafluoride SF6). Unlike qualitative detectors that can only judge whether there is a leak or not, it can provide specific concentration values (such as ppm), making it a key tool for equipment status assessment and safety assurance in fields such as electric power, chemical industry, and scientific research.
⚙️ Core Principles and Technologies
The core of a gas quantitative leak detector lies in its highly sensitive sensors, which use different physical or chemical principles to identify and quantify gas concentration.
High-frequency ionization principle: This is a common technology for detecting halogen gases such as SF6. The vacuum pump inside the instrument draws air samples into the ionization chamber, where the high-frequency electromagnetic field ionizes gas molecules. When the sample contains SF6 gas, its ionization characteristics change, and the instrument calculates the SF6 concentration precisely by detecting this change. This method has extremely high sensitivity, reaching 0.01ppm.
Non-dispersive infrared (NDIR) technology: It utilizes the characteristic that different gases have unique absorption rates for infrared light at specific wavelengths. The instrument emits infrared light through the gas sample and determines the target gas concentration by measuring the attenuation of light intensity at specific wavelengths. This technology has good selectivity and is not easily interfered by other gases.
Electrochemical sensors: Mainly used for detecting toxic gases such as carbon monoxide (CO) and hydrogen sulfide (H2S). The target gas undergoes a chemical reaction on the sensor electrode, producing a weak current proportional to the gas concentration, and the concentration can be determined by measuring this current.
