Working Principle
Under a certain pressure, when the temperature is slightly lower than the dew point (the saturation temperature of water vapor in the gas), the water vapor in the gas condenses into dew. This causes the light irradiated on the mirror surface to generate diffuse reflection. The photosensitive device produces a change in the electrical signal. The detection circuit sends the change in the electrical signal and the temperature data to the control system for analysis. Through an intelligent algorithm, the dew point temperature value of the measured gas is calculated and displayed (* The dew point below 0°C is called the frost point). The schematic diagram of the dew point meter is shown in Figure 1:

Figure 1 Schematic Diagram of the Dew Point Meter

2. Main Technical Specifications

Measurement Method	Fully automatic continuous measurement
Gas to be Measured	SF6
Gas Flow Rate	400~800±50ml/min
Flow Display	Digital flow meter
Temperature Resolution	0.1℃
Measurement Range	20℃ ~ -62℃
Measurement Error	Better than ±0.3℃
Display Units	℃, ppm
Measured Gas Pressure	≤1MPa
Operating Environment Temperature	-20℃ ~ 50℃
Operating Environment Humidity	≤85%RH
External Power Supply	AC220V±10%, 50Hz
Built-in Power Supply	24V lithium battery
Power	≤70W
Normal Continuous Operation Time	>8h
Measurement Principle	Cold mirror measurement principle
Cooling Source	SL micro cooler
Sampling Interface	Self-sealing quick connector
Dimensions	Length 340mm × Width 230mm × Height 200mm
Weight	≤9.5 kg

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