Appendix I : Extracting an Oil Sample
Proceed as follows to sample the oil from the transformer (see below):
1. Remove the Hydran 201Ti’s aluminum cover.
2. Open the Luer stopcock valve of the glass syringe and ensure the syringe is free of air.
3. Insert and adjust the tip of the syringe valve into the sensor’s sampling port.
4. Using the 5/32-in Allen key, slowly open the sensor’s bleed screw.
5. Generally, the oil pressure by itself should fill the syringe. If not, slowly pull the
syringe’s plunger.
6. When the syringe contains enough oil (35 ml for a DGA), shut the bleed screw.
7. Close the stopcock valve of the syringe.
8. Withdraw the syringe.
9. Empty the syringe; make sure to purge all air bubbles from the syringe. This first
extraction wets the inner walls of the syringe with liquid to assure better accuracy
of sampling.
10. Repeat steps 3 to 8 to extract the oil sample.
11. Purge all air bubbles from the syringe.
12. Put back the aluminum cover.
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