Dual Canopy Mechanic Electrical Engineering Co., Ltd. is one of the leading manufacturers and suppliers of Sf6 Dew Point Tester in China. Please feel free to wholesale discount products for sale here and get quotation from our factory. Customized orders are welcome.
What is SF6 Dew Point Tester?
The SF6 Dew Point Tester (also known as SF6 Moisture Analyzer or SF6 Micro-water Meter) is a specialized portable instrument designed to measure the moisture content (dew point or frost point) in Sulfur Hexafluoride (SF6) gas.
In high-voltage electrical equipment such as Gas Insulated Switchgear (GIS), SF6 circuit breakers, and transformers, SF6 gas acts as an insulating and arc-quenching medium. The presence of moisture (H2O) in SF6 gas is highly detrimental. It reduces the dielectric strength of the gas, promotes the formation of toxic and corrosive decomposition products (like HF and SO2) during electrical discharges, and can lead to condensation inside the equipment, causing surface discharge or flashover.
Therefore, accurate and regular measurement of the dew point is a critical part of preventive maintenance. Our SF6 Dew Point Tester utilizes advanced sensor technology (typically high-polymer film or chilled mirror principle) to provide fast, accurate, and reliable measurements of moisture content, typically expressed in Dew Point (°C) or Parts Per Million (ppmv).
This instrument is an essential tool for power utilities, electrical maintenance contractors, and manufacturers of SF6 equipment to ensure the integrity and safety of their assets.
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SF6 Dew Point Gas Moisture Analyzer
1. Open the instrument to observe the power of the instrument. If the power is insufficient, charge it in time.
2. Check carefully whether the transition connector is complete and whether the sealing ring is installed properly.
3. After arriving at the test site, first turn on the power switch of the instrument and connect the exhaust pipe (lead the outlet of the pipe to an unmanned place)
4. Select the adapter that matches the equipment. First, connect the air intake pipe to the adapter and then connect the adapter to the measured equipment.
5. Close the flow control valve on the instrument panel, connect the intake pipe to the instrument's inlet, and observe if the automatic calibration time has ended. Once the automatic calibration is complete, set the drying knob to the Measure (measurement) mode, then slowly open the flow control valve and maintain the flow at 0.5~0.9L/Min. The flow rate does not affect the measurement results but can impact the calibration time.
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Measuring range |
-80 ℃~+20 ℃or-60~+60℃ (with ppmv automatic conversion, etc.) |
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Measurement accuracy |
less than or equal to 1℃ |
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Resolution rate |
dew point 0.1℃ or 1ul/l |
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Repetition |
±0.5℃ |
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Gas flow |
When measuring humidity: 0.5~0.9L/min, electronic mass flowmeter, sample gas flow rate has no effect |
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Probe protection |
stainless steel sintered filter screen |
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Working voltage |
220VAC±10% 50Hz, both AC and DC, overcharge protection, continuous operation not less than 8 hours |
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Storage temperature grade |
-40~+70℃ |
Pre-sales Service
Selection Consultation: Based on the type of equipment being tested (GIS, circuit breaker, etc.), site environment (indoor/outdoor), and accuracy requirements, we recommend the most suitable model (standard, high-precision, explosion-proof).
Technical Q&A: We answer technical questions regarding the SF6 micro-moisture measurement principle, unit conversion (dew point to ppm conversion), and national standard requirements.
Prototype Trial: We provide prototype trial services for key customers to verify product performance.
After-sales Service
Warranty Period: 24-month warranty for the entire unit (12-month warranty for sensors, excluding damage caused by human error).
Lifetime Maintenance: Lifetime paid repair service is provided after the warranty period, charging only for the cost of parts.
Technical Support: 24/7 telephone technical support and remote operation guidance are provided.
Our address
Baoding Cloud Center, Hebei, China
Phone Number
+86 13483219412
salesm@dualcanopy.com
Q1: What is the difference between Dew Point (°C) and PPMv in SF6 gas measurement?
A: Dew Point (°C) is the temperature at which water vapor in the gas begins to condense into liquid water at a given pressure. PPMv (Parts Per Million by Volume) is the ratio of water vapor volume to the total gas volume. They are two different ways to express the same moisture content. Our tester can display both units and automatically convert between them based on the ideal gas law or specific SF6 conversion tables. For example, at atmospheric pressure, a dew point of -40°C is approximately equal to 127 ppmv.
Q2: Why is it necessary to measure the dew point of SF6 gas?
A: Moisture is the enemy of SF6 equipment. Excessive moisture reduces the insulation strength of SF6 gas, increasing the risk of flashover. More critically, moisture combines with decomposition products (formed during arcing) to create highly corrosive acids (like Hydrofluoric Acid - HF), which damage internal components and metal surfaces. Regular dew point measurement ensures the gas remains dry and the equipment operates safely.
Q3: How often should I calibrate the SF6 Dew Point Tester?
A: We recommend annual calibration (every 12 months) to ensure measurement accuracy and traceability. Calibration involves comparing the tester's readings against a known reference standard (like a chilled mirror hygrometer or a certified humidity generator). We offer professional calibration services with certificates.
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