Page 193
Hydran* M2-X Instruction Manual
MA-029
Rev. 1.0,
30-Jul-18
Appendix J.
Extracting an Oil Sample
This procedure is valid only if positive oil pressure is present
at the sensor. If negative pressure exists (possible for sealed
transformer),do not use this method.
1.
Open the Luer stopcock valve of the glass syringe and ensure the syringe is free
of air.
2.
Insert and adjust the tip of the syringe valve i
nto the sensor’s sampling port.
3.
Using the 5/32-
in Allen key, slowly open the sensor’s bleed screw.
4.
Generally, the oil pressure by itself should fill the syringe. If not, slowly pull the
syringe’s plunger.
5.
When the syringe is full, shut off the bleed screw.
6.
Close the stopcock valve of the syringe.
7.
Withdraw the syringe.
8.
Empty the syringe; ensure all air bubbles are purged from the syringe. This first
extraction allows oil to wet the inner walls of the syringe with liquid to assure
better accuracy of sampling.
9.
Repeat steps 2 to 7 to extract the oil sample.
10.
Purge all air bubbles from the syringe.
11.
Fill an identification card for this sample. Indicate the relative humidity and
temperature readings performed by the Hydran M2-X at the time of extraction.
WARNING
Figure J-1: Extracting an Oil
Sample from the Sensor's Sampling
Port Using a Glass Syringe and a 5/32
in Allen Key
