GE Hydran M2-X Instruction Manual page 26

The enclosure is composed of the following parts (see Figure 2-3):
1. Cover: The cover provides mechanical and weather protections for the
sensor and electronic card cage (see Figure 2-4).
2. Cover screws: Four screws maintain the cover in place. The cover can be
easily removed to access the electronic card cage.
3. Gasket: This gasket renders the joining of the cover and heater plate
impermeable to water.
4. Heater plate: The heater plate accommodates the dynamic oil sampling.
The dynamic oil sampling system is carefully controlled to generate oil
convection and ensure accurate gas readings. For details, see Section 2.5.
CAUTION
5. Membrane vent: Air penetrates through the watertight membrane vent
and inside the Hydran M2-X. The gas detector requires air to function
properly.
6. Conduit fittings: Up to six watertight, non-conducting conduit fittings can
be mounted on the heater plate. They are used to install standard,
watertight, flexible (recommended) or rigid steel conduits. The conduit
fittings are made of non-conducting material (plastic) to prevent problems
caused by ground loops through the conduits (for example, if the
transformer tank is grounded at a single point and monitored
continuously for tank-to-ground currents).
Page 26
Figure 2-3: External Pats of the Hydran M2-X
The surface of the base plate can be hot. Heating
for the dynamic oil sampling system (see Section
2.5) is achieved using heating resistors mounted
on the internal side of the base plate.
Hydran* M2-X Instruction Manual
MA-029 Rev. 1.0, 30-Jul-18