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17996 Rev5, August 2013
5.6 Opening the Valve
This step should be performed according to company
regulations. Proceed carefully to avoid introducing air into the
transformer. Use a bucket to collect the oil.
1. Using the supplied 5/32-in Allen key, fully close the sensor’s bleed screw and
then open it 1/8 of turn.
2. Slowly open the transformer valve until oil leaks out of the sensor’s sampling
port (see Figure 16 below).
Figure 16: Purging Air from the Hydran 201 Sensor
3. When there are no more air bubbles present in the oil, shut the bleed screw
tightly.
4.
Open the valve completely.
CAUTION
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