Table of Contents

Product Introduction

Chromatography technology separates multi-component mixtures according to differences in boiling point, polarity and adsorption coefficient inside the chromatographic column, and performs qualitative and quantitative analysis on each separated component.

Complying with the power industry standard Method for Determination of Dissolved Gas Content in Insulating Oil (Gas Chromatography), this instrument adopts microcomputer automatic control, full keyboard operation and large LCD screen. It features high temperature control precision, stable performance, high sensitivity and good repeatability.

Equipped with a dual-column parallel split flow system, TCD, dual FID and methanator, it can complete full analysis of seven dissolved gas components (H₂, CH₄, C₂H₂, C₂H₄, C₂H₆, CO, CO₂) in transformer oil with one injection. Nine-component gas analysis (H₂, O₂, N₂, CH₄, C₂H₂, C₂H₄, C₂H₆, CO, CO₂) is available as an option.

It is widely applied to internal fault detection via transformer oil gas analysis, cooling medium analysis of hydrogen-cooled generators, SF₆ gas analysis, boiler flue gas analysis, natural gas analysis and environmental monitoring. Supporting both offline and online analysis, it serves as universal gas analysis equipment for power, petrochemical, mining and other industries.

Alternative Names: Transformer Oil Gas Chromatograph, Automatic Transformer Oil Gas Chromatograph

Main Technical Parameters

Item	Specification
Display	192×64 dot matrix Chinese LCD
Temperature Control Zones	6 channels
Temperature Control Range	Ambient +5℃ ~ 400℃; increment: 1℃; accuracy: ±0.1℃
Programmed Temperature Ramp Stages	16 stages
Heating Rate	0.1 ~ 40℃/min
Gas Circuit Control	Mechanical valve control or electronic mass flow control (optional)
External Events	4 channels
Sampling Options	Packed column, capillary column, six-port gas sampling valve, automatic vacuum sampling
Detectors	Up to 5; FID, TCD, ECD, FPD, NPD (optional)
Injection Mode	Manual / Automatic
Communication Interface	Ethernet: IEEE802.3

Detector Performance Index

Detector Type	Item	Specification
Flame Ionization Detector (FID)	Detection limit	≤3×10⁻¹² g/s
	Baseline noise	≤5×10⁻¹⁴ A
	Baseline drift	≤1×10⁻¹³ A/30min
	Linear range	≥10⁷
Thermal Conductivity Detector (TCD)	Sensitivity	S≥10000 mV·mL/mg (gain ×1, ×2, ×4, ×8 optional)
	Baseline noise	≤20 μV
	Baseline drift	≤30 μV/30min
	Linear range	≥10⁵
Electron Capture Detector (ECD)	Detection limit	≤1×10⁻¹⁴ g/mL (Lindane)
	Baseline noise	≤0.03 mV
	Baseline drift	≤0.2 mV/30min
	Linear range	≥10⁴
	Radioactive source	⁶³Ni
Flame Photometric Detector (FPD)	Detection limit	(S) ≤2×10⁻¹¹ g/s, (P) ≤1×10⁻¹² g/s (methyl parathion)
	Baseline noise	≤3×10⁻¹³ A
	Baseline drift	≤2×10⁻¹² A/30min
	Linear range	S≥10³, P≥10⁴

Product Features

Built-in 10/100M adaptive Ethernet port and IP protocol stack, supporting remote data transmission through LAN and Internet for easier laboratory deployment and data management.
Three independent connection channels enable real-time monitoring by on-site operators, department supervisors and higher-level management.
Optional NetChrom TM workstation can control multiple chromatographs simultaneously, simplifying document management and lowering laboratory operation costs.
Chinese and English bilingual operating interface, freely switchable by users.
Temperature control zones support custom naming for convenient operation.
Multi-processor parallel design improves stability; multiple optional detectors can be installed or added later for flexible upgrades.
Modular structure facilitates maintenance and upgrade and protects customer investment.
Advanced microcomputer temperature control system with 6 independent temperature channels and 16-stage programmed temperature ramp, delivering high precision and strong anti-interference ability.
Optional Electronic Flow Controller (EFC) and Electronic Pressure Controller (EPC) adopt digital control to greatly improve repeatability of qualitative and quantitative results.
Timed startup function supports continuous online gas analysis when matched with automatic sampling equipment.
Full keyboard operation with automatic detector identification, fault diagnosis and power-off data protection.
Low-noise high-resolution 24-bit AD circuit, supporting baseline storage and baseline subtraction.
Compatible with Windows operating systems. It supports AIA standard CDF format and can connect with Agilent, Waters and other mainstream chromatography workstations.
Independent chromatographic system equipped with standard MODBUS/TCP interface for seamless connection to DCS.
Compatible with automatic samplers from many well-known brands at home and abroad, such as Shimadzu AOC-20i and HTA HT series autosamplers.

FAQ for Dissolved Gas Analyzer

Q1: What is the main function of a dissolved gas analyzer?

A1: It quantitatively detects dissolved gas components in transformer insulating oil. By analyzing H₂, CH₄, C₂H₂, CO and other gases, it diagnoses overheating, discharge and other hidden internal faults of power transformers.

Q2: Which gas components can the instrument test?

A2: It supports seven conventional fault characteristic gases (H₂, CH₄, C₂H₂, C₂H₄, C₂H₆, CO, CO₂). Optional configuration enables nine-component gas analysis including O₂ and N₂.

Q3: What standards does the dissolved gas analyzer comply with?

A3: It meets the power industry standard for dissolved gas testing in insulating oil and ASTM D6595 standard, widely adopted for transformer on-site and laboratory oil analysis.

Q4: Is sample pretreatment required before testing?

A4: Standard headspace sampling is adopted. After oil sample extraction and gas balance treatment, automatic sampling analysis can be carried out according to the operation procedure.

Q5: What detectors are equipped inside the analyzer?

A5: It is configured with TCD and dual FID together with methanator. Multiple optional detectors such as ECD, FPD and NPD are available to expand other testing applications.

Q6: Can the equipment realize remote data transmission?

A6: Yes. The built-in Ethernet communication interface supports remote uploading of test reports. It can connect with workstation software and DCS system to realize centralized data management.

Q7: Does it support online continuous monitoring?

A7: The laboratory model is mainly for offline sampling analysis. When matched with an automatic online sampling module, it can realize long-term continuous dissolved gas monitoring of transformers.

Q8: How long does one complete set of gas analysis take?

A8: A full quantitative analysis of all characteristic gases can be finished within 30 minutes, and test results, gas ratio judgment and fault diagnosis reports can be automatically generated.

Q9: Can the software judge transformer faults automatically?

A9: Supporting the three-ratio method and improved three-ratio method. The system automatically calculates gas concentration ratios and gives preliminary fault judgment suggestions for reference by operation and maintenance engineers.

Q10: What are the applicable scenarios of this analyzer?

A10: Power grid substations, power plants, transformer manufacturers, third-party testing institutions. It can also be used for SF₆ gas analysis, flue gas analysis and other general gas testing projects.

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