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7.3.5
Installing the Hydran 201 Sensor
Cover the sensor's threads with Teflon tape (see Figure 7-4).
CAUTION
1. Slightly loosen the sensor's bleed screw, using the supplied 5/32-in Allen key.
2. Screw the sensor manually onto the adaptor.
3. Tighten the sensor using General Electric's Hydran 201TW tube wrench (see
Figure 6-4) or a strap wrench. Do not use a pipe wrench. Do not use excessive
force when tightening the H201 sensor onto the valve.
Note: If the H201 sensor is installed horizontally, ensure the bleed screw is on top (at
the "12 o'clock" position); see Figure 7-6 below.
4. Ensure the bleed screw is in place. Do not tighten it now.
7.3.6 Opening the Valve
CAUTION
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 7-7)
3. When there are no more air bubbles present in the oil, shut the bleed screw
tightly.
4. Open the valve completely.
5. Wipe all traces of oil from the sensor.
Page 110
Use only PTFE tape to seal the threads of both the adapter and
the Hydran 201 sensor. Wrap at least 4 to 5 layers of tape
around the threads.
Always wrap the tape counter to the treads.
Figure 7-6: Bleed Screw must be on top, at the 12 O'clock position
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.
Hydran* 201i Instruction Manual
MA-033
Rev. 14.0, 12-Nov-18
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