Purging The Sensor Head - ABB CoreSense M10 Installation Manual

7 Tighten all rotating flange screws by hand.
8 With the 5 mm hex key, tighten the rotating flange screws to 8.1 N·m (6.0 lbf.ft) according to the
tightening pattern below.
NOTICE
The rotating flange screws must be tightened to 8.1 N·m (6.0 lbf.ft) to prevent oil leaking
from the rotating flange.
Do not apply excessive torque.

Purging the sensor head

Once the sensor head has been properly installed, you need to purge the air out of the unit. This is
performed through the sampling adapter. As indicated by the label on top of the adapter cover (see
image below), the sensor head sampling adapter port is delivered in an open state.
38
Installation Guide
1
5
3
7

SAFETY
WARNING
Sensor's bleeding valve is OPEN upon delivery
Air bubbles in the tank of an energized transformer
pose a serious safety risk. In order to prevent air
bubbles entering the transformer during installation:
1
Ensure the bleeding port is open BEFOrE opening
the transformer valve. Close the bleeding port only
after all air in the transformer valve has been
properly purged.
2
Ensure the transformer has a positive gauge
pressure before opening the transformer valve.
Never open the valve of a transformer with negative
gauge pressure while the transformer is energized.
8
4
6
2