Product Overview

MOEORW-WEP73 is a new-generation integrated gas chromatograph developed for transformer oil dissolved gas analysis. The equipment integrates high automation, easy operation and long-term operational stability, supporting quantitative and qualitative detection of trace, minor and constant organic, inorganic and permanent gas components. Compared with legacy 6970 models, analog pressure gauges are eliminated, replaced with valve regulation and digital flow display; detector hardware structure is upgraded to deliver higher detection sensitivity. Equipped with multiple optional detectors and IoT network architecture, it is compatible with domestic and mainstream Windows operating systems, applicable to multi-scenario laboratory and on-site industrial analysis.

Working Principle

Gas chromatography adopts inert carrier gas as mobile phase. Vaporized oil sample is transported by carrier gas into chromatographic column. Different components interact differently with stationary phase inside the column, leading to distinct elution retention times for component separation. Separated substances flow into matched detectors and convert concentration signals into electrical signals. The built-in data processing system generates chromatograms, realizing qualitative analysis via retention time and quantitative analysis via peak height/peak area.

Technical Specifications

General Instrument Specifications

Item	Parameter
Display Module	7-inch high-definition capacitive touch screen
Temperature Control Zones	8 independent control circuits
Temperature Control Range	Ambient +5℃ ~ 450℃
Temperature Setting Increment	0.01℃
Temperature Control Accuracy	±0.01℃
Programmed Temperature Ramp Stages	99 stages (expandable to 999 stages)
Max Heating Rate	120℃/min
Pressure Sensor Support	Up to 20 channels
External Event Control	12 input channels, 4 auxiliary input, 2 auxiliary output
Injector Compatibility	Packed column injector, capillary injector, 6-port gas sampling valve, auto-sampler port
Detector Slots	Supports up to 4 detectors simultaneously
Communication Interface	Gigabit Ethernet, Wi-Fi, built-in instrument hotspot
Power Supply	220V±10%, 50Hz±0.5Hz, minimum power ≥2500W
Operating Ambient Temp.	5℃ ~ 35℃
Relative Humidity	0~85% non-condensing

Detector Performance Indicators

Detector Type	Core Performance Parameters
FID Flame Ionization Detector	Detection limit ≤1.1×10⁻¹²g/s; Baseline noise ≤2×10⁻¹⁴A; Linear range ≥10⁷
TCD Thermal Conductivity Detector	Sensitivity ≥12000mV·ml/mg; Baseline noise ≤0.05mV; Linear range ≥10⁵
ECD Electron Capture Detector	Detection limit ≤1.0×10⁻¹⁴g/mL; Radioactive source: ⁶³Ni; Linear range ≥10⁴
FPD Flame Photometric Detector	S detection limit ≤8×10⁻¹²g/s, P detection limit ≤8×10⁻¹⁴g/s; Linear range S≥10², P≥10³
NPD Nitrogen-Phosphorus Detector	N detection limit ≤1.0×10⁻¹²g(N)/s, P detection limit ≤5.0×10⁻¹³g(P)/s; Linear range ≥10³ for N & P

Gas Purity Requirement

Gas Type	Application	Minimum Purity
Nitrogen / Helium	Carrier gas	99.999%
Hydrogen	Fuel gas	99.99%
Compressed Air	Oxidant gas	Dry & clean
Nitrogen	Makeup gas	99.99%

Core Functional Features

1.Hardware & Network Architecture Design Adopts industrial high-integration chips and micro-flow gas control modules; built-in full TCP/IP protocol stack, supporting Gigabit Ethernet, Wi-Fi and local hotspot access. Compatible with MODBUS/TCP, HTTP and MQTT protocols to realize seamless docking with DCS and LIMS systems. IoT remote monitoring enables real-time equipment status tracking, parameter configuration and batch data centralized management.
2.Temperature Control System Performance Equipped with PT100 temperature sensors and dual software over-temperature protection for column oven; auto rear door structure realizes fast heating & cooling, with independent 8-channel temperature output supporting up to 99-stage programmed temperature rise. Column oven internal volume ≥23L to accommodate various capillary and packed columns.
3.Modular Detector Configuration Value Detectors including FID, TCD, ECD, FPD, NPD, HID and PDECD are optional, with maximum 4 detectors installed concurrently. Modular disassembly structure simplifies component cleaning, replacement and on-site maintenance, reducing equipment downtime. Detector hardware is upgraded compared with old 6970 models for improved signal amplification and higher overall detection sensitivity.
4.Touch Screen Operation & Data Processing 7-inch capacitive touch screen with flat UI for direct parameter setting, real-time chromatogram preview and equipment fault diagnosis. Built-in component usage counting module to remind scheduled replacement of septa, liners and nozzles. Supporting Windows, domestic OS and Android tablet workstations for offline spectrum analysis, curve calibration and test report export.
5.Precision Gas Circuit Control Mechanical precision pressure-stabilizing & flow-stabilizing valves with independent pressure-flow algorithm for accurate digital flow display. Full system air tightness self-inspection function; external gas pipeline adopts Φ3×0.5 stainless steel / PTFE tube with standardized pressure input parameters for carrier gas, hydrogen and air.
6.Safe & Stable Operation Mechanism Standardized power grounding design to eliminate electrical noise and prevent electric shock risks; TCD implements automatic bridge current zero reset after power-off to avoid tungsten filament burnout without carrier gas. Built-in system log module to record operation records and alarm information for traceability of abnormal conditions.

Application Fields

Power industry: Dissolved gas analysis of transformer insulating oil, power equipment fault diagnosis

Petrochemical: Crude oil refining monitoring, constant/trace gas composition detection

Environmental monitoring: Trace halogen, sulfur and nitrogen pollutant testing

Food & pharmaceutical: Residual pesticide detection, solvent residue analysis

Clinical & public health: Biochemical sample volatile component testing

Scientific research & teaching: Laboratory separation analysis of volatile organic and inorganic substances

FAQ

Q1: Instrument fails to connect with workstation, how to troubleshoot?

A: Verify physical network cable/Wi-Fi connection; check matching IP address segment; disable firewall and antivirus interception; inspect equipment and computer network indicator status.

Q2: No chromatographic peak appears after sample injection

A: Confirm injector temperature reaches vaporization requirement; check carrier gas supply and pipeline leakage; replace blocked syringe; ignite FID flame or activate TCD bridge current.

Q3: Baseline noise remains high during testing

A: Replace regenerated carrier gas filter; clean contaminated injector liner and detector; optimize instrument grounding; adjust hydrogen/air flow rate for FID.

Q4: TCD detector signal output is abnormal without sample injection

A: Stop operation and contact manufacturer for inspection of tungsten wire matching and internal circuit plug-in connection; strictly follow "gas supply first, then bridge current activation" operation sequence.

Q5: Separation effect of chromatographic peaks is poor

A: Adjust carrier gas flow velocity and column oven temperature; replace aged chromatographic column; optimize programmed temperature rise parameters.

Q6: What are the maintenance intervals for consumables?

A: Replace injection septum, liner and FID nozzle when the system usage counter reaches the preset threshold; clean FID ion chamber and injector liner with acetone regularly.

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