4.3.1.3 Warnings
This Section details important considerations for the installation of the Hydran
M2-X.
1. Always mount the sensor on a full-bore gate or ball valve where there is
sufficient convective oil flow.
2. If the Hydran M2-X is mounted directly on the wall of the transformer tank,
ensure it is installed below the oil level.
3. No obstructions (baffle, pipe, etc.) must exist behind the valve (inside the tank).
4. The Hydran M2-X is installed on a valve with a 1.5 in (approximately 38 mm)
nominal diameter (NPT female threads) or larger. If necessary, use a reducing
bushing.
Note: General Electric does not recommend installing the Hydran M2-X on a 1-in
diameter valve, due to the weight of our instrument and the vibration of the
transformer. Our tests have indicated that if a 1-in pipe is used to install the Hydran
M2-X to a distance exceeding 63 mm (2.5 in), the pipe may break under certain
conditions.
5. For valves 1.5 in or more in diameter: The total distance between the Hydran
M2-X and the mounting point of the valve must not exceed six times the
nominal diameter of the valve (230 mm [9 in] for a 38-mm [1.5-in] valve); see
Figure A - 7.
6. Ensure there is enough clearance above and below the Hydran M2-X to
separate it from its sensor. For more information, see Section A.2.1.
7. The Hydran M2-X must always be easily accessible.
8. The body of the valve should be grounded.
9. The Hydran M2-X weighs approximately 7.5 kg (16.5 lb). If the selected valve is
subject to strong vibrations, install a supporting bracket to reduce the load on
the valve. In case of doubt, consult the engineer responsible for the installation.
10. Do not install the Hydran M2-X on an elbow or a fitting box (see Figure 1-5).
The turbulent oil flow at these locations may result in inaccurate gas level
readings.
4.3.1.4 Vertical Installations of the Hydran M2-X
Regardless of the selected location, it is recommended to mount the Hydran M2-
X horizontally (as shown on Figure 4-1). If no horizontal valve is available, a vertical
installation may be acceptable; contact the General Electric Customer Service (the
coordinates can be found at the bottom of page 9).
If the Hydran M2-X is installed vertically, note the following points:
• The sensor’s threaded extremity must be oriented upward.
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