Transformer Oil Dissolved Gases Analysis by Gas Chromatograph
This gas chromatograph is used for dissolved gas analysis of transformer oil by gas chromatography method, full automatic operation and high accuracy.
- Model： 3420A
Features:
Self-diagnostic function:
1) Core tests;
2) Automatic tests;
3) Extended tests;
4) Basic tests;
Monitor the status of GC continuously. Once finding faults, it’ll display the information and show the wrong zone and the settling method.
Self-protective function:
1) Overrun temperature protection;
2) Short circuit hint;
3) TCD filament protection;
4) FID flameout hint;
5) PFD exposed-light protection;
6) Keyboard locking with password; etc., ensuring normal running.
Simple operation, powerful automation:
1) All parameters can be entered through keyboard with prompt function;
2) 4 sets of complete chromatography analysis methods can be stored and recalled automatically;
3) An autosampler can be connected;
4) Parameters can be modified instantly while the GC is running;
5) Chromatography analysis method can be activated for 99 times repeatedly at the same time. It’s especially suitable for unattended operation.
More choices of injectors:
1) On- Column Injector for Packed Column;
2) Flash Vaporization Injector for Packed Column
3) Automatic or manual gas inject valve;
4) Headspace sampler;
5) Thermal desorption system
6) Split/Splitless Capillary Injector; Three Injectors or two Split/Splitless Capillary Injectors can be fixed on GC.
More choices of detectors:
1) TCD; 2) FID; 3) ECD; 4) FPD; 5) TSD
Maximum of two TCDs or three different kinds of detectors can be installed.
Reactor: 1) Internal; 2) external
Time programming of detectors:
Each of detectors has 5-ramp programmable time control. Output-signal, attenuation range, and polarity can be set automatically.
Time programming of external events:
Providing 4 external events with 20-ramp programmable time control. The optional GC relays may be used to automate valves, operate split/splitless capillary injectors, drive auxiliary devices, or switch signals between detector A and detector B in a run.
Many kind of special-purpose GC can be provided according to user’s request.
Specifications:
Column oven:
Operating temperature range: ambient temperature to 400℃;
Dual opening-door at the back of column oven;
Cooling time: 250℃ to 50℃ in 5 min;
Programmable oven with 4-ramp temperature control;
Temperature programming rate: 0.1~50℃/min
Injector system:
Operating temperature range: ambient temperature to 400℃
Thermal conductivity detector -TCD:
Maximum temperature: 400℃
Sensitivity: ≥10000mv • mL/mg (for butane)
Linear range: 105
Current range: 50 to 400mA
Filament protection:
If He or H2 carrier gas flow in the detector cell is cut off for 4 minutes, filament power will be shut off automatically.
Flame ionization detector-FID:
Maximum temperature: 400℃
Minimum detectivity: ≤5×10-12g/s (n-C16)
Linear range: 107
Flameout hint: monitoring the status of GC continuously after being turned on.
Electron capture detector-ECD:
Maximum temperature: 400℃
Minimum detectivity: ≤0.1pg/mL (γ-666)
Linear range: 104
Emission source: 11mC63Ni
Flame photometric detector-FPD:
Maximum temperature: 400℃
Minimum detectivity:
[P] ≤2×10-12g/s (tributyl phosphate)
[S] ≤2×10-10g/s (p-methylsulfurphosoharous)
Linear range: [P]:105 [S]: 103
Two air-hydrogen flames：For large volume injection or trace sample injection analyses;
Single air-hydrogen flame: sulfur sensitivity can be increased;
Direct output: for phosphorus or sulfur analyses;
Square-root output: for sulfur analyses;
Exposed-light protection:
When exposed-light current is more than 12μA, high voltage will be cut off automatically.
Nitrogen-phosphorus detector-TSD:
Maximum temperature: 400℃
Minimum detectivity:
[N] ≤2×10-13g/s (azobenzene)
[P] ≤1×10-13g/s (malathion)
Linear range: [N]:105 [P]: 104