Transformer oil chromatograph (Transformer Oil Dissolved Gas Analyzer) is used to determine the component content of dissolved gas in transformer oil by chromatography. It is an effective means for power generation and power supply enterprises to judge whether there are latent overheating, discharge and other faults in oil filled power equipment in operation, so as to ensure the safe and effective operation of power grid. It is also a necessary means for oil filled electrical equipment manufacturers to carry out factory inspection on their equipment.
It is suitable for the determination of dissolved gas components in insulating oil of power system. The total analysis of seven dissolved gas components in insulating oil can be completed with one sample injection. The minimum detection concentration of acetylene is 0.05ppm, the stable time is less than 40 minutes, and the baseline is stable.
Main detection: H2, Co, CO2, CH4, C2H4, C2H6, C2H2

Instrument features




Technical data
Model | YJJ-309 |
Temperature control | Above room temperature4- 450ºC, Liquid nitrogen refrigeration for optional:-80ºC-400ºC |
Accuracy of column oven temperature control | ±0.02ºC |
Display accuracy | 0.1ºC |
Column oven rising rate | 30 stage 31 platform temperature programming, 0-40 ºC / min (adjustment increment 0.1 ºC / min) up to 80 ºC / min |
Temperature programmed repeatability | ≤1% |
TCD Detector sensitivity | S value≥15000mv.ml/mg(benzene) |
Baseline drift | ≤30uv/30min |
Baseline noise | ≤10uv |
FID Detection limit | ≤3×10-12g/s(Cetane) |
Baseline drift | ≤1×10-13 A/30min |
Baseline noise | ≤5×10-14A/30min |
Automation Engineering | It can be added: automatic injector connection, four ways flow pressure display functions; Anti-control workstation for optional |

Measurement index of transformer oil
Minimum detection limit of gas in transformer oil (unit: uL / L)
H2 | CO | CH4 | CO2 | C2H4 | C2H6 | C2H2 |
≤1.5 | ≤2 | ≤0.05 | ≤5 | ≤0.05 | ≤0.05 | ≤0.05 |
(Better than national standard)
Base Configuration
Name | Qty | Description | Remarks |
Host | 1 | Network reverse control chromatograph, 7-inch color touch screen, large volume column oven design, integrated vaporizer design, double column and double gas path, double steady flow design, microcomputer temperature control, real-time display of six temperature control, temperature rise state, network (up to 253 channels) digital signal output, fault self-test, overheat protection, timing switch on and off, removable quartz high-temperature nozzle, 30 stage 31 platform temperature program Automatic double back door opening system (can connect multiple external events, suitable for real-time online monitoring), automatic ignition | |
Chromatographic injector | 1 | Packed column injector | For microinjector injection |
High sensitivity detector | 3 | FID detector 2sets,TCD detector 1set(Multiple magnification) | |
Special chromatographic column for determination of transformer oil | 3 | One test H2,CO,CO2; One test CH4,C2H4,C2H6,C2H2; One for TCD reference gas | Neutral or weak polarity |
Ni Reformer | 1 | Convert trace CO, CO2 into CH4 and respond in FID | |
Fully automatic oscillator | 1 | For sample oil and gas collection | |
Standard gas | 1 | 7-component dissolved gas, 4L, including pressure relief valve | |
Accessories | 1 | 200 small rubber caps, 10 pieces for 5ml & 100ml glass syringe, 2 pcs for 1ml glass syringes, 1 Quantitative card and 1 box of stainless steel needles | |
Special chromatographic workstation for transformer oil | 1 | Used for chromatograph control and data communication | Digital signal communication, various parameter setting of computer counter control chromatograph |
Computers and printers | 1 | Windows XP or win7, 32-bit system | |
Hydrogen generator | 1 | High purity hydrogen (up to 99.995%) is produced | Hydrogen cylinders (including pressure relief valves) can also be purchased |
Air generator | 1 | Three stage oil-free compressed air is produced | Air cylinders (including pressure relief valve) can also be purchased |
Nitrogen cylinder and pressure reducing valve | 1 | 99.999% Nitrogen 40L |

