• Dissolved: Water dissolved in oil and available to move from the oil to the air
or to the solid insulation in the transformer to reach equilibrium.
• Bound: Water chemically bonded to polar molecules such as by-products of
oxidation, and to synthetic anti-oxidants. Although this water is not readily
available to move in and out of the oil, it will to some extent.
• Oversaturated: This water in a free state is present in the oil in a concentra-
tion exceeding the solubility of water in oil and is, in effect, saturating the oil.
• Water bonded to cellulose and metal particles in suspension in oil.
The conventional Karl Fischer titration method measures the total water content
in oil in ppm (the sum of all four forms of water in oil). The moisture sensor provides
essentially the measurement of water dissolved in the oil.
2.1.3 Optional I/O Interfaces
Up to four optional I/O interfaces can be installed. Available types are:
• 4–20 mA analog input
• 4–20 mA analog output
Any combination is allowed. For more information, see item 3 on page 28.
2.1.4 Backward Compatibility with Hydran Products
General Electric’s Hydran products line also includes the Hydran 201Ti Intelligent
Transmitter (H201Ti) and the Hydran 201Ci Controllers, a generic term that
encompasses the three Hydran Controllers:
• Hydran 201Ci-C Communications Controller (H201Ci-C)
• Hydran 201Ci-1 One-Channel Controller (H201Ci-1)
• Hydran 201Ci-4 Four-Channel Controller (H201Ci-4)
The H201Ti and Hydran Controllers can be combined in various ways to form a
Hydran 201i System. To summarize, a Hydran 201i System is either a H201Ti used
alone or the combination of at least one H201Ti and a Hydran 201Ci Controller. The
Hydran 201R Model i is a specific configuration of Hydran 201i System, which
consists of one H201Ti linked to a H201Ci-1.
The Hydran M2-X also includes controller functions. The Hydran M2-X is designed
to be compatible with the communication features of the three Hydran 201C i
Controllers. A Hydran M2-X can therefore replace a H201Ti in any Hydran 201i
System and communicate with the Perception software using a laptop computer.
Note: The H201Ci -1 and H201Ci-4 can only display the gas level reading of the
Hydran M2-X, not the humidity level. They are also limited to two alarm levels: gas
High and High-High (Alarm 1 and Alarm 2 of the Hydran M2-X).
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