RDP-206

SF6 Dew Point Hygrometer

Precision dew point measurement for SF6 gas systems used in high-voltage power equipment such as GIS substations, circuit breakers, and gas-insulated transmission lines (GIL).

The RDP-206 uses the primary chilled mirror condensation principle to provide accurate and stable dew point verification while minimizing the influence of SF6 phase transitions during measurement.

Designed for field and laboratory use, the instrument provides reliable moisture measurement for SF6 gas and SF6 gas mixtures in power industry applications.

Key Features

• Primary chilled mirror dew point measurement
• Optimized for SF6 gas and SF6 gas mixtures
• Minimized influence from SF6 phase transitions
• High accuracy without sensor drift
• Stable performance under field sampling conditions
• Fast response for maintenance and commissioning work

Measurement Challenges in SF6 Systems

Moisture measurement in SF6 gas systems can present specific technical challenges.

Under certain pressure and temperature conditions, SF6 may undergo phase transitions, which can influence gas equilibrium and sampling behavior. These effects may introduce uncertainty in dew point readings if the measurement system is not properly designed.

The RDP-206 measurement design and gas flow control strategy are optimized to minimize the influence of SF6 phase transitions, ensuring stable and reliable dew point determination in practical field conditions.

Technical Specifications

ParameterSpecificationMeasurement principleChilled mirror condensationDew point range+20 °C to −55 °CMeasurement gasSF6 and SF6 gas mixturesResponse timeOptimized for field samplingMeasurement stabilityHigh repeatabilityDriftNo sensor drift (primary method)ApplicationsPower equipment SF6 systems

Typical Applications

High-Voltage Power Industry

• GIS substation manufacturing and commissioning
• Circuit breaker testing
• Gas quality inspection in substations
• SF6 gas recycling and purification systems

Calibration and Laboratory Use

• Calibration laboratories
• Instrument verification
• Research laboratories
• Gas quality testing facilities

Instrument Positioning

The RDP-206 provides verification-grade dew point measurement for SF6 systems where conventional humidity sensors or routine dew point meters may not provide sufficient measurement stability or traceability.