SF6 Gas Dew Point Meter | Detailed introduction of technical principles

The core principle of the SF6 trace moisture analyzer is based on the measurement of water vapor partial pressure in the gas, converting the moisture content into a quantifiable electrical signal through a sensor. The mainstream technology is the polymer thin-film capacitance method.

Its core utilizes a capacitive humidity sensor that is highly sensitive to water molecules. The sensor's core is an extremely thin polymer film whose dielectric constant changes significantly with the amount of adsorbed water vapor. When SF6 gas containing trace amounts of moisture flows through the sensor, water molecules are selectively adsorbed by the film, causing a linear change in its capacitance value.

The instrument measures this capacitance change through a precision circuit and, based on the calibration relationship between water vapor partial pressure and capacitance value, directly calculates the dew point temperature of the gas at the current temperature and pressure. Finally, it automatically converts and displays the volume fraction (ppm₀) under standard conditions (e.g., 20°C, 101.3 kPa). This method offers fast response and high sensitivity, making it a key means of evaluating the insulation performance of SF6 gas. SF6 Gas Dew Point Meter, Trace Moisture Analyzer, SF6 Gas Dew Point and Trace Moisture Analyzer Measurement Range: -80℃ to +20℃

The core component of the SF₆ trace moisture analyzer uses the DRYCAP® series sensor manufactured by Vaisala, Finland.

With selection guidance from Vaisala's professional engineers, combined with STMicroelectronics' professional hardware chips and excellent software algorithms,

our company's new generation of gas trace moisture analyzers has been developed.

The SF₆ trace moisture analyzer has a measurement range of -80℃ to +20℃, with a full-range accuracy better than ±2℃. Annual drift is ≤1℃. The instrument features a beautiful and reasonable design and uses high-quality materials.

The overall design is a modular solution. Transportation and carrying options are compatible with our full range of SF₆ gas analysis equipment. The product is suitable for field use in any natural environment.

1. Measurement accuracy better than ±2℃.

2. Full-channel polymer material design ensures no moisture adhering to the wall and guarantees testing speed.

3. Oil-free stainless steel regulating valve ensures accurate test values.

4. Advanced software algorithms improve the testing accuracy of imported sensors.

5. Modular chassis configuration allows users to easily combine related instruments and accessories.

6. Portable design provides a more convenient user experience.

7. Ready to test immediately upon power-on; no preheating or vibration process required.

8. Temperature conversion and pressure data correction functions.

9. Fuzzy logic technology simplifies the software calculation process, resulting in faster and more reliable test results.

10. High-power lithium battery system allows for both AC and DC power supply.

11. No need for on-site AC power. Lithium battery power allows for continuous operation for over 8 hours without external power.

12. Electromagnetic interference protection circuit design ensures product reliability.

13. Stable test data; simultaneously provides standard dew point values and converted dew point values at 20℃.

14. Optimal test flow range display allows users to intuitively and quickly adjust gas flow. Shorten testing time.

15. The air inlet adopts a miniature self-sealing connector design; no leakage will occur in the tested air path when the air path is disconnected.

1. Measurement Method: Resistor-capacitor measurement principle (Finnish Vaisala DMT series sensor)

2. Ambient Temperature: -20℃ to +60℃

3. Measurement Range: -80℃ to +20℃

(When the dew point temperature is below 0℃, the sensor output is the frost point)
Response Time: 63% [90%]
+20→-20℃ Td 5s [45s]
-20→-60℃ Td 10s [240s]

4. Measurement Error: Better than ±2℃ (When the dew point temperature is below 0℃, the sensor output is the frost point)

5. Repeatability Error: ±0.5℃ Resolution: 0.01℃

6. Display Unit: ℃ ppm ℃P20 (with dew point conversion value for ambient 20℃)

7. Gas Flow Rate: 400-600ml min

8. Flow Rate Display: 0-1000mL imported digital flow meter

9. Sample Gas Pressure: ≤1MPa

10. Ambient Humidity 90%RH

11. Impact of Measurement Values: Pressure and flow rate have no effect.

12. Operating Environment: Temperature: -35-+60℃; Pressure: 0-20 bar; Sample gas flow rate: No effect.

13. Other Configurations: Electronic mass flow meter.

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