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      Accurate insight of the condition of transformers is essential for all electrical networks and on-line monitoring of critical transformers has become increasingly important. The knowledge gained from closely monitoring expensive transformers can maximize its longevity and avoid expensive failures.

On-Line Transformer Gas Analyzerrepresents a new generation of test equipment for analysis the dissolved gas in oil. IOD TGA adopted the advanced infrared photo-acoustic spectroscopy technology and the friendly operation interface. The concentration data of the 8 key fault gases and moisture can be drawn directly within 20 minutes in the field. It really can take place of the Gas Chromatography system in the laboratory because of the accurate, rapid, reliable results. Thus the IOD TGA is one of the best tools for the electric equipment asset evaluation.

BENEFITS: 
* Fast measuring in the field 
Within 20 minutes, 8 key fault gases and moisture can be read 
* No consumables 
Pure physical photo-acoustic spectroscopy technology, 
The consumables of calibration gas and carry gas are needless. 
* Moisture in the oil 
The concentration of moisture in the oil can be given during the same one test,±1ppm 
* Simple 
Step-by-step software guides and touch screen, the user pass through the procedure. 
* Portable and r ed 
Weights <10 kg, in a r ed and convenient carry case. 
* Reliable 
Engineered design provides inherent reliability and high accuracy. 
* PC communication 
PC software allows downloading, trending and analysis of results 
* Sample Period 
The sample is adjustable, and the minimum period <1hour. 
* Reliable Gas Extraction 
No use of membranes or vacuum extraction

Accuracy or tolerance : when valve <20ppm,±1ppm ; 
while > 20ppm ,±10% 
Environment temperature :-40℃ ~ +55℃ 
Oil temperature :-40℃ ~ +110℃ 
Humidity:10 ~ 100% RH, without condensation 
Enclosure: IP56 
Weight: 40Kg 
Oil pressure:while running,0~3bar(0~45psi); 
Others, -1~+6bar(-15~+87psi); 
Dimension : 760× 600 × 350 mm 
Communications:USB,RS232,RS485,Modem 
Power:90~250VAC, 47~63Hz, 150W 
Sampling period:1~24 Hours 
 
 THEORY: 

 The photo-acoustic effect is caused by the ability of a gas to absorb electromagnetic radiation (e.g. infrared light). In absorbing the radiation the temperature of the gas will increase and, if the gas is held in a sealed container, this temperature rise will produce a proportional rise in pressure. If the light source is pulsed the pressure of the gas fluctuates in sympathy and these pressure waves can then be detected using sensitive microphones. 

There are two key facts that permit this effect be used for analytical measurements. The first is that each gas has a unique absorption spectrum, thereby allowing the frequency of the infrared source to be tuned to excite a given substance. The second is that the level of absorption is directly proportional to the concentration of the given gas. 

Therefore by selecting an appropriate wavelength and measuring the level of the resultant signal it is possible to detect, not only the presence but also the concentration of any given gas, even in a complex cocktail of other compounds. This forms the central principle of Photo-Acoustic Spectroscopy (PAS). 

After the gas is extracted from the oil by controlled excitation of the sample it is then analyzed using photo-acoustic spectroscopy, the same method used by the European Space Agency for monitoring blood gases .