Product Overview
The MEFJ-M9 SF6 comprehensive gas analyzer is an intelligent high-precision detection device independently developed by Wuhan Moen Intelligent Electric Co., Ltd. It adopts imported core sensing components: Vaisala high-stability humidity sensor from Finland, temperature-compensated micro thermal conductivity cell, and high-resolution electrochemical sensors from AlphaSense UK, equipped with embedded microcomputer control technology.
The instrument simultaneously detects SF6 gas humidity, purity, and decomposition toxic products including SO₂, H₂S, HF, CO. It identifies early internal faults of SF6 insulated electrical equipment such as circuit breakers, GIS, transformers, current transformers and busbars. Built-in expert diagnosis algorithm, cloud data transmission and gas tail gas harmless treatment structure are integrated to support on-site rapid testing for power, railway, metallurgy and petrochemical industries.
Safety reminder: SF6 decomposition gas contains toxic substances. Operators must discharge waste gas far away from working areas and wear acid gas respirators during testing.
Technical Specifications
|
Item |
Parameter Index |
|
Measurement Range |
SO₂: 0～100 µL/L / 0～2000 µL/LH₂S: 0～100 µL/LCO: 0～1000 µL/LHF: 0～20 µL/LSF6 Purity: 0～100%Dew Point: -80℃ ~ +20℃ |
|
Minimum Detectable Limit |
SO₂/H₂S/HF: ≤0.1 µL/LCO: ≤0.5 µL/LPurity: ≤0.03%Dew Point: ≤0.1℃Leakage detection: ≤0.1 µL/L |
|
Measurement Accuracy |
SO₂/H₂S/HF: ≤0.5 µL/L (≤10 µL/L); ±5% (>10 µL/L)CO: ≤2.0 µL/L (≤50 µL/L); ±4% (>50 µL/L)Purity: ≤±0.1%Dew Point: ≤±0.5℃Leakage detection: ≤1.0 µL/L (≤20 µL/L); ±5% (>20 µL/L) |
|
Repeatability |
SO₂/H₂S/HF: ≤0.3 µL/L (≤10 µL/L); ≤3% (>10 µL/L)CO: ≤1.5 µL/L (≤50 µL/L); ≤3% (>50 µL/L)Purity: ≤0.05%Dew Point: ≤0.3℃Leakage detection: ≤0.5 µL/L (≤20 µL/L); ≤3% (>20 µL/L) |
|
Response Time |
≤50 s |
|
Gas Flow Rate |
Decomposition & Purity: 200±5% mL/minHumidity test: 500±10% mL/min |
|
Linear Degree |
≥99.9% |
|
Zero Drift (-20℃~50℃) |
SO₂/H₂S/HF ≤±0.1 µL/L; CO ≤±0.5 µL/L |
|
Gas Chamber Pressure |
0~1.0 MPa (0.25 grade) |
|
Max Inlet Pressure |
≤1.0 MPa |
|
Single Test Duration |
Approx. 3 min |
|
Operating Ambient Temperature |
-20℃ ~ +50℃ |
|
Power Supply |
AC 220V/50Hz + Built-in lithium battery; continuous operation ≥12 h after full charge, with overvoltage & undervoltage protection |
|
Display |
800×480 high-resolution true-color touch LCD screen |
|
Data Storage Capacity |
Over 10,000 test records, automatic storage every 40 s + manual storage |
|
Data Output Interface |
USB, RS232C |
|
Dimensions & Weight |
390×310×190 mm; Net weight 3.5 kg |
Technical Specifications
|
Item |
Parameter Index |
|
Measurement Range |
SO₂: 0～100 µL/L / 0～2000 µL/LH₂S: 0～100 µL/LCO: 0～1000 µL/LHF: 0～20 µL/LSF6 Purity: 0～100%Dew Point: -80℃ ~ +20℃ |
|
Minimum Detectable Limit |
SO₂/H₂S/HF: ≤0.1 µL/LCO: ≤0.5 µL/LPurity: ≤0.03%Dew Point: ≤0.1℃Leakage detection: ≤0.1 µL/L |
|
Measurement Accuracy |
SO₂/H₂S/HF: ≤0.5 µL/L (≤10 µL/L); ±5% (>10 µL/L)CO: ≤2.0 µL/L (≤50 µL/L); ±4% (>50 µL/L)Purity: ≤±0.1%Dew Point: ≤±0.5℃Leakage detection: ≤1.0 µL/L (≤20 µL/L); ±5% (>20 µL/L) |
|
Repeatability |
SO₂/H₂S/HF: ≤0.3 µL/L (≤10 µL/L); ≤3% (>10 µL/L)CO: ≤1.5 µL/L (≤50 µL/L); ≤3% (>50 µL/L)Purity: ≤0.05%Dew Point: ≤0.3℃Leakage detection: ≤0.5 µL/L (≤20 µL/L); ≤3% (>20 µL/L) |
|
Response Time |
≤50 s |
|
Gas Flow Rate |
Decomposition & Purity: 200±5% mL/minHumidity test: 500±10% mL/min |
|
Linear Degree |
≥99.9% |
|
Zero Drift (-20℃~50℃) |
SO₂/H₂S/HF ≤±0.1 µL/L; CO ≤±0.5 µL/L |
|
Gas Chamber Pressure |
0~1.0 MPa (0.25 grade) |
|
Max Inlet Pressure |
≤1.0 MPa |
|
Single Test Duration |
Approx. 3 min |
|
Operating Ambient Temperature |
-20℃ ~ +50℃ |
|
Power Supply |
AC 220V/50Hz + Built-in lithium battery; continuous operation ≥12 h after full charge, with overvoltage & undervoltage protection |
|
Display |
800×480 high-resolution true-color touch LCD screen |
|
Data Storage Capacity |
Over 10,000 test records, automatic storage every 40 s + manual storage |
|
Data Output Interface |
USB, RS232C |
|
Dimensions & Weight |
390×310×190 mm; Net weight 3.5 kg |
Core Functional Features
Hardware & Structural Design
1.800×480 large touch LCD, supporting dual display modes of real-time digital value and trend curve for intuitive data comparison.
2.Built-in electric sampling pump and electronic mass flowmeter with real-time flow indication; automatic pipeline purging after measurement to protect sensors.
3.Independent harmless tail gas treatment module to eliminate sulfide and fluoride pollutants, reducing occupational health risks.
4.Complete 16-piece brass polished adapter set with built-in filters, compatible with most domestic and overseas SF6 equipment exhaust ports and cylinder pressure reducing valves.
5.Integrated real-time clock, battery voltage monitoring module, with low power reminder and overcharge/over-discharge protection circuit.
6.Multiple communication ports (dual USB + RS232C) supporting on-site equipment upgrade, offline data export and external printing.
Calibration & Measurement Performance
1.Multi-point sensor calibration and full-process dew point curve correction algorithm; automatic dew point zero calibration, with 20℃ standard dew point one-click conversion function.
2.Volume ratio/mass ratio of SF6 purity one-click switching, simultaneous multi-parameter synchronous measurement (dew point, purity, decomposition products, ambient temperature & humidity).
3.Temperature compensation design for all sensors; low zero drift under wide temperature range (-20℃~50℃), stable long-term measurement output.
4.No colorimetric tube required; direct sensor sampling with fast response and high linearity to guarantee consistent repeatability of test data.
Data Management & Intelligent Diagnosis
1.Dual storage mode: automatic cyclic storage every 40 seconds and manual storage with editable equipment ID (support letters, numbers and Chinese characters).
2.Multi-dimensional data query: filter historical records/curves by all data, latest period, specified date or fixed time point; support batch data deletion and U-disk data export.
3.Three-level user authority management (Operator, Supervisor, Manufacturer) to restrict high-risk operations including parameter compensation, factory reset and sensor calibration.
4.Built-in professional expert diagnosis system, classified evaluation for circuit breakers and other SF6 equipment under handover/preventive test standards, with automatic risk assessment for GIS equipment via cloud service terminal.
Application Fields
1.Power Industry: Routine preventive test, handover acceptance, internal fault location of SF6 GIS, circuit breakers, transformers, current/voltage transformers and busbars.
2.Railway Power System: Online and offline detection of traction substation SF6 high-voltage equipment.
3.Metallurgy & Petrochemical: Monitoring of SF6 insulated high-voltage power distribution equipment, gas purification filtration efficiency verification, fault contact decomposition product inspection.
4.Third-party Testing Institutions: Standardized laboratory and field SF6 gas comprehensive sampling inspection.
5.Equipment Manufacturers: SF6 gas quality inspection before factory delivery of high-voltage electrical products.
Standard Accessories
1.Main analyzer host ×1
2.16-piece brass filter adapter set ×1
3.Extended PTFE sampling tube, exhaust pipe ×1 set
4.AC power charging cable ×1
5.Fuse spare parts ×2
6.Operation manual (including humidity conversion tables) ×1
7.U-disk for data export (optional)
FAQ
Q1: How long is the mandatory preheating time before formal testing?
A1: For purity measurement: ≥20 min if ambient temperature＞20℃; ≥30 min if ambient temperature＜20℃. For humidity and decomposition products: minimum 10 min preheating. Testing can start when the thermal balance indicator flashes red-green alternately.
Q2: Can the "Zero Clear" button be used during gas sampling?
A2: Forbidden. If triggered accidentally, stop measurement immediately, purge pipeline for 5 min via built-in pump then re-zero or restart the device.
Q3: What are the requirements for SF6 cylinder gas sampling?
A3: Outlet pressure ≤1.0 MPa; cylinder must not be inverted to avoid liquid SF6 outflow. Adjust flow rate slowly to prevent sudden pressure shock to sensors.
Q4: How often does sensor calibration need to be performed?
A4: Routine full calibration every 6–12 months, operated by trained supervisors with qualified standard gas. Zero calibration is required when any drift value exceeds ±0.32.
Q5: Data cannot be exported via USB flash drive?
A5: Check two points: 1) Start time is earlier than end time; 2) USB flash drive is properly inserted and recognized by the instrument. Follow on-screen prompts to troubleshoot.
Q6: How to store the instrument during long-term idle state?
A6: Fully charge the lithium battery before storage; check battery voltage periodically to avoid deep discharge damage to the power module. Avoid vibration, extrusion and high-temperature storage environment.
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