GC-7890 laboratory equipment transformer oil dissolved gas chromatograph

(Model: DGA-7890)

Introduction

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.

Tachnical parameters

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.