The precision dew point meter adopts the world's advanced sensor technology, the new sensor of British ALPHA company, it adopts DRYCAP-film sensing technology and humidity-sensitive material, and has three world patents: polyester film probe DRYCAP. Resistant to condensation, dust particles, resistant to gasoline and most gases, ideal for industrial environments with low dew points and controlled dry points. Precautions for the use of the precision dew point meter, the instrument should be placed in a safe location to prevent damage. Avoid violent vibrations. Do not measure corrosive gases. The probe should be cleaned and calibrated after a certain period of time, and the calibration cycle should be one year.

When the precision dew point meter adjusts the gas flow, the control needle valve should be opened slowly so that the flow indication is 0.5-0.6 L/min. If the flow exceeds 1 L/min, the LCD will show that the flow has exceeded the limit. At this point, the flow rate should be reduced to the specified value. (Excessive flow rates can damage the electronic flow sensor).

After the precision dew point meter is used for one day (using the battery), it should be charged in time. When charging, just connect the power cord to the 220V socket, no need to turn on the power switch. The instrument will automatically charge, and the charging time is generally more than 5 hours.

The importance of moisture measurement with precision dew point meter, moisture content is an important factor affecting insulation aging. Excessive water content will reduce the insulating properties of insulating materials and accelerate their aging, resulting in reduced reliability of operating equipment and shortened service life.

For hydrogen-cooled units, high hydrogen humidity is one of the main factors affecting the safe operation of generators. With the continuous production of large-capacity and high-parameter units, there have been many vicious accidents in which the hydrogen humidity exceeds the standard and burns the generator. The accurate measurement of traditional hygrometer parameters can no longer ensure the safe operation of the equipment and cannot meet the needs of the power system.

Micro water (humidity) measurement method, for the measurement of SF6 gas humidity, the commonly used methods are gravimetric method and Coulomb electrolysis method. One method has high requirements on environmental conditions and long measurement time, and is generally only used for arbitration analysis. Another method consumes a lot of gas when measuring, and the equipment needs to be energized and dried for many years when not in use, and the repeatability is poor. The usual measurement methods are ventilated dry and wet bulb method and Coulomb electrolysis method.

The structure principle of the precision dew point meter, the inner core is a high-purity aluminum rod, the surface of the aluminum rod is oxidized into an aluminum oxide film, and is plated with a porous gold film, and a capacitor is formed between the gold film and the inner core. Due to the water absorption characteristics of the aluminum oxide film, when the water vapor molecules are sucked into it, the capacitance value changes, and the humidity can be obtained by detecting and amplifying the capacitance signal.