True North

Your guarantee of results reliability

Dissolved Fault Gas Analysis (DGA) is the most effective way of detecting incipient faults in oil-filled electrical equipment. The accepted methods for performing this test are outlined in the ASTM D3612 and IEC 60567 standards. Both standards require proper calibration of the laboratory equipment used to perform DGA prior to analyzing oil samples from the field.

 

The use of certified oil standards is recognized as the ideal way of verifying not only the entire method but also the calibration of the gas chromatographs used in the analysis. However, oil standards have not yet been available on a commercial basis because of the technical difficulties and associated costs. Consequently, most laboratories have restricted their calibration process to the gas analysis part of the method, in other words the calibration of the gas chromatograph. This, however, does not address either systematic or random errors that may occur in the extraction phase of the analysis.

 

Small quantities of independently known oil standards have always been used internally for quality control in the Morgan Schaffer labs. We have now developed methods for producing large and stable quantities of such standards. These standards are now available commercially and will be invaluable to both DGA clients and DGA labs for the verification of analytical reliability.

 

Each True North DGA Sample is carefully prepared from a bulk standard on the day it is shipped. A Certificate of Concentration is delivered with each sample as a guarantee of accuracy and traceability.

 

True North samples are offered on a per sample basis or as part of yearly calibration program packages. Sample concentrations are in the 100 -150 ppm range for each fault gas (exact concentrations are indicated on each Certificate of Concentration), 10,000-15,000 ppm range for oxygen and 40,000-45,000 ppm for nitrogen. True North packages available include standards for monthly, bi-monthly, weekly, by-weekly, or daily calibrations.

 

Specifications

  • Supplied in 30cc glass syringes with precision matched pistons.
  • Each syringe individually packed in specially designed cardboard box.
  • Signed Certificate of Concentrations included with each individual sample.
  • Shipped in IATA accepted 1, 4, 6, 12 or 24-pack boxes.
  • Concentrations guaranteed by method of preparation

Advantages

  • The only way to verify total analytical system performance.
  • Provides a common base for calibration of all DGA systems, independently of gas extraction method, gas detection technique or equipment used.
  • Common reference guarantees significance of data trending using results from different laboratories.
  • Excellent for client or laboratory assessment of analytical performance using blind samples.

Technical Advantages

  • Industry accepted glass syringes prevent loss of dissolved gases to the atmosphere or contamination by atmospheric components.
  • Individual cardboard packaging prevents generation of fault gases by exposure to light.
  • IATA accepted outer packaging guarantees timely and trouble free shipping of oil standards by air, worldwide.
  • Morgan Schaffer's preparation and quality control processes are in accordance with the principles outlined in IEC 60567 and ASTM-D3612 for the preparation of oil standards.

References to True North
 
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