Multi-function SF6 Gas Analyzer | VS-9608

Products Details

VS-9608 SF6 Comprehensive Tester is an integrated Multi-function SF6 Gas Analyzer engineered for condition assessment of SF6 gas utilized in high-voltage electrical assets. Sulfur hexafluoride (SF6) gas is extensively deployed in circuit breakers, gas-insulated switchgear (GIS), substations, and insulated systems due to its superior dielectric insulation and arc-extinguishing characteristics. Over extended operational lifespans, gas quality can deteriorate from moisture ingress, partial discharge, electric arcing, ambient leakage, thermal aging, or internal contaminants. Systematic verification of dew point, gas purity, and decomposition products assists maintenance teams in determining whether SF6 equipment remains fit for safe operation.

The VS-9608 consolidates three essential diagnostic functions into a single portable instrument: SF6 dew point measurement, SF6 purity testing, and SF6 decomposition product analysis. Rather than transporting multiple standalone devices to field sites, operators can perform complete gas quality evaluations during a single sampling sequence. This design minimizes SF6 gas consumption during field testing and enhances efficiency across routine maintenance, equipment commissioning, troubleshooting, and factory acceptance inspections.

For moisture analysis, the tester measures SF6 dew point across a range of -80°C to +20°C. When the recorded dew point falls below 0°C, the sensor output represents frost point per manual specifications. Both real-time dew point and converted dew point at 20°C standard temperature can be displayed based on operational parameters.

For gas concentration evaluation, the VS-9608 measures SF6 purity from 0% to 100%, offering configurable display options in weight ratio or volume ratio. Purity values displayed during initial sensor preheating serve as reference readings only; precise purity indications require waiting until the thermal conductivity sensor preheats to between 59.0°C and 60.5°C.

For decomposition product detection, the device quantifies H₂S, SO₂, HF, and CO concentrations. These compounds represent crucial chemical indicators for internal fault diagnosis, as SF6 breakdown products form following internal arcing, discharge events, localized overheating, or insulation defects. Detecting these components enables maintenance personnel to identify subtle internal faults prior to catastrophic equipment failure.

The instrument features a large LCD touch screen with bilingual Chinese and English menus. The user interface displays real-time measurement data, dynamic trend curves, historical records, system info, time settings, calibration parameters, language selection, and backlight adjustments. Operators can input equipment names, asset numbers, and technician credentials prior to storing records. Saved test data can be retrieved for historical analysis or printed directly from the primary measurement screen.

For field procedures, the unit must be powered on before sampling begins. Following automatic calibration and sensor preheating, technicians connect the exhaust pipe to a safe discharge zone, attach the appropriate transition adapter, connect the inlet hose to the switchgear test port, and regulate sampling flow via the adjustment valve. Recommended gas flow is controlled between 0.2 and 0.5 L/min. Once readings stabilize, the analyzer automatically completes measurement cycles, allowing technicians to review, store, or print reports.

Specification

Dew Point Measurement
Item	Specification
Measurement item	SF6 dew point
Measurement range	-80°C to +20°C
Measurement accuracy	±0.5°C
Sensor note	When dew point temperature is below 0°C, sensor output is frost point
Response time, +20°C to -20°C	63% response: 5 s; 90% response: 45 s
Response time, -20°C to -60°C	63% response: 10 s; 90% response: 240 s
Optional display	Dew point at current condition and dew point converted to 20°C

 

SF6 Decomposition Product Measurement
Gas	Measurement Range	Accuracy
H2S	0 to 100 μL/L	≤10 μL/L: ±0.5 μL/L; >10 μL/L: ±5%
SO2	0 to 100 μL/L; 0 to 2000 μL/L	≤10 μL/L: ±0.5 μL/L; >10 μL/L: ±5%
HF	0 to 10 μL/L	≤10 μL/L: ±0.5 μL/L; >10 μL/L: ±5%
CO	0 to 500 μL/L	≤50 μL/L: ±2.0 μL/L; >50 μL/L: ±4%

 

SF6 Purity Measurement
Item	Specification
Measurement item	SF6 purity
Measurement range	0 to 100%
Display modes	Weight ratio and volume ratio
Measurement accuracy	≤±0.1%
Measurement time	<2 minutes
Sensor warm-up note	Purity value is accurate after preheating to 59.0°C to 60.5°C

 

Interface And Data Functions
Item	Specification
Display	Large LCD display
Operation	Touch screen
Menu language	Chinese and English
Measurement display	Real-time data and real-time curves
Data storage	Large-capacity historical data storage
Record fields	Equipment name, equipment number, test personnel
Printing	Supports printing of measurement information
Settings	Date/time, system parameters, language, calibration parameters, brightness
Optional communication	Bluetooth data reading when configured

 

Operation Conditions From Manual
Item	Specification
Recommended gas flow	0.2 to 0.5 L/min
Initial calibration/warm-up before connection	About 5 minutes
Post-test purge gas	High-purity N2
Calibration cycle	Once per year

 

Maintenance Requirements
Item	Specification
Charging indication	Red light: charging; green light: fully charged
Charging operation	Instrument does not need to be powered on during charging
Storage	Charge fully before long-term storage and recharge periodically
Handling	Avoid severe vibration
Touch screen care	Avoid sharp objects
Sensor protection	Purge residual gas with high-purity N2 after measurement

Working Principle & Procedure

The VS-9608 draws a controlled gas sample from SF6 electrical equipment through internal sensors for moisture, concentration, and breakdown gas detection. Real-time data and trend curves display instantly on the screen. Once stability parameters are satisfied, measurement completes automatically for data saving or printing.

1. Pre-Test Check: Ensure the internal battery is charged, inspect transition adapters, and verify sealing ring integrity.

2. Warm-Up Phase: Power on the tester at site and allow approximately five minutes for self-calibration and sensor preheating. Route the exhaust pipe to a safe discharge area and keep the flow valve closed.

3. Gas Connection: Select the matching adapter, connect the inlet hose to the adapter, and attach to the SF6 equipment test point. Monitor sensor preheating until the purity module reaches 59.0°C–60.5°C.

4. Sampling & Testing: Open the flow adjustment valve slowly to maintain sampling rate between 0.2 and 0.5 L/min. After stability detection, the unit executes dual automated measurements. Save or print test results.

5. Post-Test Maintenance: Disconnect adapters from equipment first, then detach sampling hoses. Purge internal flow paths with high-purity N₂ to clear corrosive residue and protect internal sensors.

Features

• Supports integrated SF6 dew point, purity, and decomposition product testing.
• Measures SF6 dew point from -80°C to +20°C.
• Measures SF6 purity from 0 to 100%.
• Measures H2S concentration from 0 to 100 μL/L.
• Measures SO2 concentration with 0 to 100 μL/L and 0 to 2000 μL/L ranges.
• Measures HF concentration from 0 to 10 μL/L.
• Measures CO concentration from 0 to 500 μL/L.
• Dew point and optional converted dew point at 20°C display.
• Provides SF6 purity display by weight ratio or volume ratio.
• Displays real-time data and real-time measurement curves.
• Automatically judges measurement stability before recording results.
• Includes Chinese and English menu operation.
• Includes touch screen operation for field settings and data review.
• Provides historical record storage for saved test data.
• Provides equipment name, equipment number, and test personnel input.
• Supports on-site calibration parameter adjustment.
• Supports screen brightness and screen saver time adjustment.
• Includes factory reset and system parameter functions.
• Supports optional Bluetooth data reading when configured.
• Provides flow setting guidance for stable field sampling.

Application Scenarios

• Power Utilities: Routine SF6 gas quality inspections in substations to verify GIS, circuit breaker, and switchgear readiness.

• Transformer Manufacturers: Factory inspection and final quality checks for gas-insulated electrical components before delivery.

• Power Plants: Periodic gas condition monitoring in generator switchyards and auxiliary power systems during planned outages.

• Railways: Rapid gas assessment in compact traction substations within limited maintenance windows.

• Industrial Facilities: Gas monitoring across internal power distribution systems in mining, steel, and chemical plants.

• Universities & Labs: Academic research and practical training on SF6 gas degradation, moisture testing, and decomposition analysis.

• Testing Services & Maintenance Teams: Third-party gas verification, commissioning acceptance, and post-repair checks on GIS cable terminations.

Functional Applications

• SF6 dew point measurement in GIS equipment.
• SF6 purity measurement for circuit breakers.
• SF6 decomposition product analysis.
• H2S detection in SF6 gas samples.
• SO2 detection after discharge or arcing events.
• HF monitoring for SF6 insulation condition assessment.
• CO measurement in SF6 electrical equipment.
• Routine substation SF6 gas quality inspection.
• Commissioning tests for SF6-insulated switchgear.
• Maintenance testing after gas filling or gas recovery.
• Troubleshooting abnormal SF6 equipment operation.
• Historical record storage for maintenance reports.
• Field comparison of gas condition between multiple bays.
• Laboratory training for SF6 gas testing procedures.
• Periodic inspection of high-voltage electrical equipment.

Customer Case

• Industry: High-voltage substation maintenance.

• Problem: A maintenance crew required complete gas quality checks across multiple GIS bays during a outage window. Carrying separate instruments for dew point, purity, and decomposition testing would increase setup time and total gas consumption. The team needed a single solution capable of completing all major checks during a single sampling procedure.

• Testing Process: Technicians charged the VS-9608, verified adapters/seals, powered on the unit, and completed preheating. After setting exhaust piping, they attached matching adapters to each GIS test point and maintained gas flow between 0.2 and 0.5 L/min. Once readings stabilized, moisture, purity, and decomposition gases were recorded, saved, and printed.

• Result: Comprehensive readings for dew point, purity, H₂S, SO₂, HF, and CO were obtained from one unified setup. Assets meeting specifications remained in service, while any irregular readings were flagged for follow-up testing.

• Benefits: Reduced overall equipment requirements, minimized gas handling losses, generated uniform records for every bay, and completed all gas assessments within the scheduled outage period.

FAQ

Q1: What parameters does the VS-9608 SF6 Comprehensive Tester measure?

It measures SF6 dew point, SF6 purity, and SF6 decomposition gas concentrations including H₂S, SO₂, HF, and CO.

Q2: What is the dew point measurement range and accuracy?

The dew point range is -80°C to +20°C with an accuracy of ±0.5°C. When dew point drops below 0°C, values reflect frost point.

Q3: What is the purity measurement accuracy, and why is warm-up required?

Purity accuracy is ≤ ±0.1% across a 0–100% range. Purity readings require sensor preheating to 59.0°C–60.5°C because thermal conductivity sensors require stable operational temperatures for accurate gas concentration measurement.

Q4: What gas flow rate should be maintained during testing?

The recommended sampling flow rate is between 0.2 and 0.5 L/min, controlled via the panel adjustment valve.

Q5: What maintenance is required after completing testing?

After testing, purge residual gases from internal plumbing using high-purity nitrogen (N₂) to prevent internal corrosion. Re-charge the battery before long-term storage and recalibrate annually.

Q6: Does the manual specify a particular testing standard?

The manual does not cite a specific standard; operations should follow site safety rules, regional SF6 gas handling guidelines, and equipment manufacturer specifications.

Weshine Advantages

Weshine Electric delivers professional diagnostic solutions for power utilities, industrial plants, laboratories, and electrical contractors. Technicians requiring standalone concentration checks can also utilize our high-accuracy SF6 gas purity analyzer for dedicated purity verification tasks.

Our complete SF6 Gas Testing Instrument range emphasizes practical field usability, sensor stability, intuitive touch interfaces, and comprehensive technical support. Every instrument includes operating guidance covering sampling workflows, thermal warm-up routines, flow regulation, and post-test maintenance. Weshine supports global clients with model selection, adapter matching, customized hardware requests, and responsive technical communication to ensure reliable gas condition testing during commissioning, routine maintenance, and fault diagnostics.