GE Hydran 201 i Instruction Manual page 109

negative pressure). This location presents the H201Ti with the best combination of
oil flow, temperature and ease of access.
2. Filling valve (top of tank): In terms of performance (excellent convective oil flow),
this location is a very good alternative location to install the H201Ti. However, the
higher operating temperatures somewhat reduce the Hydran 201 sensor lifetime.
Access to the H201Ti is also more difficult.
3. Inlet of radiator: See the comments on location 2.
4. Drain valve (bottom of tank): At this location, the H201Ti performances are good,
rather than excellent. The low oil flow may affect the gas level readings; however, the
lower operating temperatures and ease of access make this location a valid alternative
choice.
Also, note the following points:
• The H201Ti must always be easily accessible. The distance between the valve and the
ground must exceed 30 cm (12 in) to install and wire the H201Ti.
• Do not install the H201Ti on an elbow (Figure 5-6 on page 5-6) or a fitting box. The
turbulent oil flow at these locations may result in inaccurate gas level readings.
• If the H201Ti is mounted directly on the wall of the transformer tank, ensure it is
installed below the oil level.
• No obstructions (baffle, pipe, etc.) must exist behind the valve (inside the tank).
• Regardless of the selected location, it is recommended to mount the H201Ti horizontally.
If no horizontal valve is available, a vertical installation may be acceptable; contact the
General Electric Canada Customer Service (the coordinates can be found at the bottom
of page ii). If the H201Ti is installed vertically, note the following points:
– The sensor's threaded extremity must be oriented upward.
– The oil temperature at this location must always be below 30 °C (86 °F).
– Do not use a 90° elbow to convert a vertical installation to a horizontal installation.
– It is recommended to set the temperature set point (Temp SetPoint parameter in the
Temperature submenu) of the H201 sensor to 45 °C (113 °F).
If these four recommended locations cannot be used, contact the
WARNING
CAUTION
General Electric Canada Customer Service (the coordinates can be
found at the bottom of page ii) to help you determine an acceptable
alternative location.
Part 17997 Rev. 6, March 2011
Installation Overview
5-11