- Alarm contacts (gas High and High-High, and system fail alarms).
- Analog output.
• A termination board to connect the H201Ci and the H201Ti with a supervisory
link.
3.2 Enclosure
The Hydran 201Ti’s enclosure (see Figure 2-1) is 186 mm (7.3 in) in diameter by 180
mm (7.125 in) in length; for details, see Figure B-1. It serves three functions:
• To provide mechanical and weather protections for the Hydran 201 sensor and
the H201Ti’s electronic circuits.
• To maintain the H201 sensor and the H201Ti electronics between 25 and 50°C (77
and 122°F) under extreme ambient and oil temperatures.
• Using the dynamic oil sampling system, to stimulate oil movement in front of the
H201 sensor to ensure representative sampling at all times.
3.3 External Components
Here is a description of the Hydran 201Ti’s external components (see Figure 3-1
below):
1. Display Window: The aluminum cover has a window to see the LCD display. The
display and the keypad are located on the CPU module (Section 3.4.4).
2. Connection Box: It is mounted on the external side of the heating plate, under
the valve. It has a removable, watertight cover and two holes to install standard
conduit fittings (for watertight, rigid or flexible steel conduits).
3. Aluminum Cover: It acts as a radiator, thus allowing the enclosure to maintain
the temperature of the sensor and electronics between 25 and 50°C (77 and
122°F), regardless of the ambient or oil temperature. The H201Ti controls the
power input to the heating plate. The cover is easily removed for access to the
H201 sensor and its oil sampling port.
4. Breathing Membrane: This Gore* porous membrane is impervious but allows
oxygen to penetrate inside the H201Ti. The H201 sensor requires oxygen to
detect the dissolved gases in oil.
5. Knob: It maintains the aluminum cover in place.
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