DGA-7890 gas chromatograph is the new generation of power system which is specially designed and manufactured for power industry. It adopts the most advanced computer control system and large screen English display.It uses the three detecting process in GB/T 17623-1998 Gas Chromatographic Determination of Dissolved Gas Components in Insulating Oil and GB/T7252-2001 Guide For Interpretation  Of  Dissolved  Gases In Transformer Oil. The advanced thermal conductivity technology improves the detection capacity of hydrogen by 10 times. The highly sensitive micro-current amplification circuit raises the detection capacity of hydrocarbon gas to the highest limit.Excellent column system ensures good chromatographic peak shape and the best separation degree. The stable gas control system guarantees analysis accurate and repeatable.

DGA-7890 gas chromatograph is the best choice for power users.
The equipment uses computer control, keyboard operation, LCD screen display. It has advantages such as high integration of electronic circuits, reliable performance, easy to operate and long-term operation available, etc.
The equipment is equipped with a thermal conductivity detector, double hydrogen flame detector and nickel reforming furnace, which can achieve automatic analysis of the dissolved gas in oil for one sample injection;
The column tank is equipped with rear door automatic cooling system. Each heating zone(injector incubator, detector incubator, auxiliary incubator and column tank incubator)is separated from each other by insulating material, so as to minimize the heat transfer between the heat zones.
The gas flow and pressure control system of the equipment are installed inside the air box. The injection system which is installed at the top of the equipment should be added sample vertically.
The signal output of the equipment can be connected to the specialized transformer oil chromatography data processing system, integrator and computer peripheral drawing equipment.

2.1 Comprehensive Parameters
Dimensions: 565 × 505 × 500 [mm]; (length × height × width).
Packing size: 730 × 650 × 610 [mm]; (length × height × width).
Column installation interval size: 150mm;
Column: Two dedicated chromatographic analysis columns
Instrument weight: 65Kg

2.2 Temperature Control

Column Box Temperature Control
Room temperature + 6 ℃ ~ 350 ℃; (freely set in increments of 1 ℃),
(Set parameters up to 399 ℃ effective, allowing users to use but not ensure technical indicators).
Temperature fluctuation: no more than ± 0.1 ℃; (ambient temperature change 10 ℃ or power supply voltage change 10%).
Temperature gradient: ± 1% (temperature range 100 ℃ ~ 350 ℃).
Program temperature program order: 7 order.
Heating rate: 0 ~ 40 ℃ / min (set freely in 0.1 ℃ increments).
Cooling rate: oven temperature from 200 ℃ to 100 ℃ time is not longer than 3min.
Time setting: 6000 (min).

Thermal Conductivity Detector Temperature Control
Room temperature plus 20 ℃ ~ 350 ℃ (index parameters).
(Set parameters up to 399 ℃ effective, allowing users to use but not ensure technical indicators).
Temperature control accuracy: not more than ± 0.1 ℃.

The Remaining Heating Zone Temperature Control
Room temperature plus 20 ℃ ~ 350 ℃ (index parameters).
(Set parameters up to 399 ℃ effective, allowing users to use but not ensure technical indicators).
Temperature control accuracy: not more than ± 0.2 ℃.

2.3 FID Detector
Detection limit: ≤ 3 × 10-12g / s [n-C16].
Noise: ≤ 3 × 10-14A.
Drift: ≤ 5 × 10-13A / 30min.
Dynamic linear range: ≥ 106.

2.4 Application Environment
Ambient temperature: (5 ~ 35) ℃.
Relative humidity: ≤85%.
Supply voltage: 220 ± 22V.
Supply frequency: 50 ± 0.5Hz.
Maximum power consumption: 2500W.

Come as a complete system.

Chongqing TOP Tester Co.,LTD belongs to Chongqing TOP Group which is located at Chongqing city--a southwest electromechanical manufacturing center as well as national municipality. We are a sci-tech enterprise and integrate development, design and manufacture. TOP owns Chongqing TOP Oil Purifier Co.,LTD and Chongqing TOP Tester Co.,LTD, with experienced engineers who are long engaged in analysis instrument development and analysis application. 

Chongqing TOP Tester Co.,LTD mainly works on the development production, market, technical and after-sale service for petrochemical analyzers, transformer substation electrical testing equipment and circuit detecting equipment. Main products are trace water content testers, fully auto surface/interfacial tension testers, open/closed cup flash point testers, kinematic viscosity testers, oil acidity testers, air release value testers, multi-functional degassing oscillation instruments, dielectric loss testers, insulation oil dielectric strength testers, transformer characteristics comprehensive testers, relay protection testers, cable testers, high voltage testing equipment etc.

Finished Products In Laboratory

Visiting Customer From South Africa

On-site Operating Guidance By Technologist

Professional pre-sale model/configuration selection advise and technical support -- offered by experienced technician.

Free on-site installation, debugging and technical training -- offered by strictly trained technology application engineers.

We build instrument service profile for our clients to record the product service and maintenance conditions.

The warranty period is 24 months from commissioning acceptance date on. After the warranty period is over we provide lifelong maintenance and technical service.

We guarantee the maintenance time no more than 3 working days and response time within 1 hour.

After instruments start service, we will pay follow-ups to collect the service conditions.