Electrolytic micro water analyzer

The core component of this type of instrument is the electrolytic cell, which is filled with moisture absorbing electrolytic media such as phosphorus pentoxide. When a gas or liquid containing trace amounts of water (with appropriate injection method) flows through an electrolytic cell, the water will be rapidly absorbed by the electrolytic medium and undergo an electrolytic reaction, with the reaction equation being 2H ₂ O → 2H ₂ ↑+O ₂ ↑. The instrument will measure the amount of electricity consumed during the electrolysis process and convert the moisture content based on Faraday's law of electrolysis (electricity is proportional to the mass of water being electrolyzed). The advantage of electrolysis method is high detection accuracy, which can achieve ppb level trace moisture detection. It is commonly used for moisture analysis of high-purity gases, insulating oils and other media. However, it should be noted that electrolysis media will be consumed with use and need to be replaced regularly to ensure detection accuracy.

Capacitive micro water analyzer

Its core is a polymer capacitive humidity sensor, and the sensor's moisture sensing film is a polymer material with hygroscopic properties. When the moisture in the measured medium comes into contact with the moisture sensing membrane, the moisture will penetrate into the membrane, causing a change in the dielectric constant of the membrane. The capacitance value is positively correlated with the dielectric constant, so the capacitance of the sensor will change with the change of moisture content. The instrument converts the capacitance signal into an electrical signal, which is then converted into a moisture content value through a calibration curve. The capacitance method has fast response speed and strong stability, and is suitable for online real-time monitoring of trace moisture in gases. However, in high humidity or corrosive media environments, special protection is required for the sensor to avoid the failure of the moisture sensing film.

Optical micro water analyzer

This type of instrument is based on optical principles to achieve moisture detection, and common methods include laser absorption and infrared spectroscopy. The laser absorption method utilizes the characteristic absorption characteristics of water molecules towards specific wavelength lasers. When the laser passes through a medium containing water, the water will absorb some of the laser energy. The instrument detects the degree of laser attenuation and calculates the water content by combining the Lambert Beer law; The infrared spectroscopy method is based on the characteristic absorption peaks of water molecules in the infrared band, and quantifies moisture by analyzing the changes in absorption intensity in the infrared spectrum. The optical method has strong anti-interference ability, can work in complex medium environments, and belongs to non-contact detection, which will not cause pollution to the measured medium. It is commonly used for trace moisture detection in flammable, explosive, and highly corrosive media.

Dew point method micro water analyzer

Its working principle is to simulate the process of dew point formation, cooling the measured gas. When the gas temperature drops to a certain value, the moisture in the gas reaches saturation and begins to condense into dew, and the temperature at this time is the dew point temperature. The instrument detects the dew point temperature through high-precision temperature measuring components, and then converts the trace moisture content in the gas based on the corresponding relationship between dew point temperature and moisture content. The dew point method is a commonly used method in the power industry to detect the micro water content of SF6 gas, with accurate and stable data. However, this method has a relatively slow response speed and requires high temperature control accuracy for the instrument, requiring regular temperature calibration.