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HF-WC-625 SF6 Dew Point Meter
SF6 Dew Point Meter is specially designed to measure trace moisture dew point value in SF6 insulating gas of GIS and circuit breakers. High-precision measurement effectively avoids internal insulation aging and metal corrosion caused by excessive water, ensuring safe operation of high-voltage power equipment.
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Our HF-WC-625 Precision Dew Point Meter adopts world-renowned Vaisala (Finland) sensors, integrating numerous research achievements and advanced technologies for dew point measurement. It is designed for trace moisture detection inside dry gases, applicable to moisture measurement for H₂, SF₆, N₂, O₂, Ar, CO₂, compressed air and other industrial gases.
Equipped with Chinese LCD display, it can directly display dew point, PPM value, relative humidity and other parameters. It comes with probe protection design to prevent condensation, oil and dirt contamination on the sensor probe. Featuring stable test precision and automatic self-check function, it incorporates a patented sealed gas cylinder built-in with non-interfering desiccant, greatly extending the sensor service life and offering fast response speed. Sealed imported connectors keep the whole instrument airtight when powered off. Various optional stainless steel adapters for SF6 switchgear connection are available, with 2 pieces supplied as standard accessories.
Main Functions & Features
- Automatic Self-Calibration: The sensor probe performs automatic zero-point calibration, eliminating systematic errors caused by zero drift to guarantee accurate readings each time, and removing the hassle of annual mandatory calibration.
- Preheating Function: The probe automatically heats up to 300℃~400℃ upon startup, instantly evaporating residual oil stains and water vapor to avoid impurity interference during testing.
- Gas-saving & Fast Measurement: It takes roughly 5 minutes to complete dew point testing for each SF6 gas compartment once entering measurement mode.
- Self-Locking Fittings: Adopts German self-locking gas connectors, which are secure, reliable and completely leak-proof.
- Data Storage: Large-capacity memory supports storage of up to 50 groups of test records.
- Measurement Curve Display: Large screen visualizes the whole dew point measurement process in curve form.
- Comprehensive Clear Display: LCD screen simultaneously shows dew point, trace water content (ppm), ambient temperature, ambient humidity, date and time.
- RS232 Communication Port: Connectable to serial printers for test data printing and report output.
- Built-in Rechargeable Power Supply: Equipped with 4Ah lithium battery; fully charged battery supports continuous operation for 10 hours.
Technical Specifications
| Item | Parameters |
|---|---|
| Dew Point Measuring Range | -80 ℃ ~ +20 ℃ |
| Measurement Accuracy | ±0.2℃ (-60℃ ~ +20℃) ±2℃ (-80℃ ~ -60℃) |
| Response Time (at +20℃ ambient) | 63% signal: 5s; 90% signal: 45s (-60℃~+20℃) 63% signal: 10s; 90% signal: 240s (-80℃~-60℃) |
| Ambient Operating Temperature | -40℃ ~ +60℃ |
| Ambient Humidity Range | 0 ~ 100% RH |
| Power Supply | AC 220V / Built-in rechargeable lithium battery |
| Battery Parameters | Charging time: 20 hours; Continuous runtime: ≥10 hours |
| Overall Weight | 5 kg |
| Overall Dimensions | 250×150×300 mm |
| Gas Working Temperature | -40℃ ~ +80℃ |
Packing List
| No. | Item Description | Qty | Unit | Remarks |
|---|---|---|---|---|
| 1 | SF6 Precision Dew Point Meter Host | 1 | Set | Equipped with original Vaisala Finland sensor |
| 2 | German Self-locking Gas Connectors | 2 | Pcs | Standard fittings for connecting SF6 high voltage equipment |
| 3 | Sampling Gas Tubing | 1 | Set | For gas extraction delivery |
| 4 | AC 220V Power Adapter & Charger | 1 | Pc | For battery charging and fixed power supply |
| 5 | RS232 Serial Data Cable | 1 | Pc | Used for data printing connection |
| 6 | Spare Desiccant Pack | 1 | Pack | Consumables to extend sensor service life |
| 7 | Bilingual User Manual (CN/EN) | 1 | Copy | Operation, calibration & maintenance guide |
| 8 | Factory Calibration Certificate | 1 | Copy | Official metrological certification document |
| 9 | Shockproof Hard Carry Case | 1 | Pc | Portable protective box for outdoor transportation |
FAQ – SF6 Dew Point Meter
Q1: What sensor is adopted inside this dew point meter?
A: It is equipped with original imported Vaisala sensor from Finland, the world-leading brand for humidity & dew point measurement, ensuring long-term stable precision and reliable test results.
Q2: What kinds of gases can this instrument test moisture content for?
A: It measures trace water vapor in SF6, nitrogen, oxygen, hydrogen, argon, carbon dioxide, compressed air and all kinds of dry inert gases, mainly applied for high voltage SF6 switchgear maintenance.
Q3: What is the dew point measuring range and accuracy?
A: Measuring range: -80℃ ~ +20℃. Accuracy: ±0.2℃ within -60℃~+20℃; ±2℃ for the range of -80℃~-60℃, fully meeting power industry inspection standards.
Q4: Does the probe need annual manual calibration?
A: No need. It supports automatic zero self-calibration, which automatically offsets zero drift errors. You can cancel annual regular calibration work and save maintenance costs.
Q5: What is the preheating function used for?
A: The probe will be heated to 300~400℃ automatically after startup, evaporating residual oil stains and condensed moisture on the probe surface to avoid contamination affecting subsequent test data.
Q6: How long does one complete SF6 gas compartment dew point test take?
A: Around 5 minutes for each measurement, fast testing and low SF6 gas consumption, effectively reducing waste of expensive SF6 insulating gas.
Q7: Are the gas joints leak-proof during sampling?
A: Fitted with German self-locking connectors, tight connection with zero air leakage; 2 standard stainless steel connectors are delivered together, more optional adapters can be customized.
Q8: What data can the instrument display and store?
A: It shows dew point value, trace water content (ppm), ambient temperature & humidity, date and time in real time. It can store up to 50 groups of historical data and display measurement curves on screen.
Q9: How to export and print test records?
A: Reserved RS232 serial interface, you can connect a serial printer to directly print all measured data reports for filing and handover.
Q10: How long can the built-in battery work continuously?
A: Built-in 4Ah rechargeable lithium battery. Full charging takes 20 hours, supporting more than 10 hours of continuous field outdoor measurement without mains power.
Q11: Can the instrument work under extremely harsh temperature environments?
A: Ambient applicable temperature: -40℃ ~ +60℃; gas working temperature: -40℃ ~ +80℃. It adapts to severe cold and high-temperature outdoor substation sites worldwide.
Q12: How is the sensor service life prolonged?
A: It has multi-protection designs: probe anti-condensation & oil pollution protection, built-in sealed desiccant tank, and airtight internal structure when shutdown, greatly slowing sensor aging.
Q13: What accessories are contained in the standard delivery package?
A: Main unit, 2 self-locking connectors, sampling tube, power charger, RS232 cable, bilingual operation manual, factory calibration certificate, spare desiccant and shockproof carrying case.
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