8. Verify the parameters pertaining to the sensor temperature (Temperature
submenu).
9. Consult the General Electric Customer Service (the coordinates can be found
at the bottom of page 9) to optimize the value of the parameters and the
location of the sensor.
8.4.4 Inaccurate Gas Readings
1. Verify the transformer’s level of fault gases-in-oil immediately by performing
a dissolved gas analysis (DGA; see Section 9.4.2.
2. Ensure the valve (on which the Hydran M2-X is installed) is fully open.
3. Confirm the valve type is acceptable (full bore, gate or ball, no restriction
between valve and tank).
4. Verify the sensor’s serial number and parameters in the Hydran M2-X’s
Service;SensorCal Data submenu (see Section 3.6.1.1).
5. Execute the Hydran M2-X’s Force Sensor Test command (Relays/Analog
submenu) to test the sensor operation.
6. Verify the parameters pertaining to the sensor temperature (Temperature
submenu).
7. Consult the General Electric Customer Service (the coordinates can be found
at the bottom of page 9) to optimize the value of the parameters and the
location of the sensor.
8.4.5 Moisture Reading of the Hydran M2-X does not correspond with
that of a Validation Method
The probable cause is an inappropriate mounting location or installation of the
Hydran M2-X. Ensure:
1. There is sufficient oil flow (forced or convective) at the mounting location of
the Hydran M2-X (see Section 4.3.1.2).
2. The transformer valve type is full-bore, gate or ball.
3. There is no restriction between the valve and the tank.
4. The valve is fully open.
5. The maximum distance between the Hydran M2-X and the mounting point of
the valve is not exceeded. See Figure A - 7 and Figure A - 8.
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