Gas chromatography DGA insulating transformer oil dissolved gases analyzer system
(Model GC-7890MD)

Application
GC-7890MD gas chromatograph is a new generation of power system dedicated gas chromatography manufactured by Chongqing TOP Oil Purifier Co., Ltd. for the power industry. The instrument uses advanced computer control system and large-screen Chinese / English display, which is in strict accordance with three detector flow recommended by the national standard GB / T 17623-1998 "Dissolved gas component content in insulating oil by using gas chromatograph method", GB / T7252-2001 " Guide for interpretation of dissolved gases in oil-immersed transformer ". Advanced thermal conductivity amplification technology to increase 10 times of the detection capacity of hydrogen. High-sensitivity micro-current amplifier circuit made the ability of detecting hydrocarbon gases rise to limit. Excellent column system ensures good chromatographic peak shape and the best resolution. Stable gas control system ensures the accuracy and repeatability of the analysis.
Instrument uses computer control, keyboard-type operation and LCD screen display, with advantages of high integration of electronic circuits, good reliability, simple operation, long-term operation and so on.
The instrument is equipped with a thermal conductivity detector, dual hydrogen flame detector and nickel converter. Seven (or nine) kinds of gas components in oil sample can be achieved with automatic total analysis at a time;
The oven is equipped with a rear door automatic cooling system. Each heating zone (the capillary injector incubator, detector incubator, auxiliary incubator, oven thermostat) is separated from each other by a heat insulating material, so that the heat conduction between the heating zones is minimized and the temperature of each heating zone can be independently controlled.
The gas flow and pressure control system of instrument is installed inside the instrument gas-line box. The injection system installed at the top of the instrument requires vertical injection.
Instrument signal output can be connected to the transformer oil chromatography data processing system, integrator, computer and other peripheral drawing equipment.

Technical Parameters
1. Comprehensive parameters
1) Dimensions: 565 × 505 × 500mm]; (length × height × width)
2) Packing box dimensions: 730 × 650 × 610 [mm]; (length × height × width)
3) Column spacing size: 150mm
4) Column: two dedicated chromatography column
5) Instrument weight: 65Kg

2. Temperature control index
Oven temperature control:                  
1) Room temperature plus 6 ºC ~ 399 ºC; (in increments of 1 ºC),
(set effectively parameter up to 399 ºC, allowing using but not to guarantee the technical index)
2) Temperature fluctuation: no more than ± 0.1 ºC; (ambient temperature change 10 ºC or power supply voltage change 10%).
3) Temperature gradient: ± 1% (temperature range 100 ºC ~ 350 ºC).
4) Program heating step: 7 step
5) Heating rate: 0 ~ 40 ºC / min (set in increments of  0.1 ºC).
6) Cooling rate: not more than 3 min  when oven cool from 200 ºC to 100 ºC
7) Time setting: 6000 (min)

Thermal conductivity detector temperature control
Room temperature plus 20 ºC ~ 350 ºC (index parameters).
(Set parameters: room temperature plus 6 ºC ~ 399 ºC effective,  allowing using but not to guarantee the technical index  ).
Temperature control accuracy: not more than ± 0.1 ºC.

The remaining heating zone temperature:
Room temperature plus 20 ºC ~ 350 ºC (index parameters).
(Set parameters: up to 399 ºC effective, allowing using but not to guarantee the technical index ).
Temperature control accuracy: not more than ± 0.2 ºC.

3. FID detector
Detection limit:≤8×10-12g/s(n-C16H34)
Noise: ≤ 2 × 10-14A(0.02mv)
Drift: ≤ 1.5 × 10-13A / 30min(0.15mv/30min)
Dynamic linear range: ≥ 107

4. TCD detector
Sensitivity: ≤5000mv.ml/mg(n-C16H34)
Noise: ≤2×10-14A (0.02mv)
Drift: ≤1.5×10-13A/30min (0.15mv/30min)
Dynamic linear range: ≥ 104

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

Product photos

Key words:
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About us
Located at Chongqing city--a southwest electromechanical manufacturing center as well as national municipality, Chongqing TOP is a professional leading manufacturer and supplier of oil purifiers and various related testers. We consists of departments respectively for technological development, machinery manufacture, instrument manufacture, quality control etc. On basis of mature development and manufacture technology and highly qualified production management team, the products own high quality, easy operation, excellent performance and lone service life.

TOP Oil Purifiers are widespread in the fields of electric power, petrifaction, mineral, shipbuilding, steel construction, bridge, automobile and railway, playing a great role in reducing energy consumption for clients as well as environmental pollution. We provides you with reliable oil purifiers such as transformer oil purifier, turbine oil purification machine, hydraulic oil purifier, lubricating oil filtration machine, fuel oil restoration, oil and water separator, oil regeneration equipment, waste oil recycling equipment etc.

TOP Testers 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 water content testers, surface/interfacial tension testers, flash point testers, kinematic viscosity testers, oil acidity testers, insulation oil dielectric strength testers, transformer characteristics testers, relay protection testers, high voltage testing equipment etc.

Honest Team - TOP always honestly treat you and keep faith to make you satisfied with every cooperation with us.
Sincere Communication - TOP sincerely communicate with you to guarantee the provided products to be your ideal ones.
Reliable Quality -TOP own high quality and high performance for every TOP product is under strict quality control and testing.
Service Commitment - TOP bring you prompt, considerate and professional aftersale service and technical support, and explore technology future together.

Our main transformer oil purifiers
ZYD Double Stage Vacuum Insulating Oil Purification Machine
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ZYD-I Double Stage Vacuum Transformer Oil Regeneration System
ZYB Single Stage Vacuum Insulating Oil Regeneration System


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5.Six Cups Insulating Oil Dielectric Strength Tester IJJ-VI
6.Insulating Oil Dielectric Strength Tester IIJ-603
7.Insulating Oil Tan Delta ( Dielectric Loss) Tester DLT0812
8.Insulating Oil Dielectric Loss And Resistivity Tester TP-6100A
9.Fully Automatic Water-Soluble Acid Value Tester PH-C
10.Fully Automatic Surface/Interface Tension Tester IT-800 
11.Fully Automatic Oil Acidity Tester (6 cups) ACD-3000I
12.Insulating Oil Gassing Property Tester DPT-20
13.Insulating Oil Oxidation Stability Tester TP622
14.Multifunctional Shaker SD-01
15.Insulating Oil Water Content Tester TP-2100
16.Online Insulating Oil Water Content Tester TPEE
17.Transformer Oil Dissolved Gas Chromatograph GC-7890MD


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