GE Hydran 201i, Instruction Manual

Page: 38 / 300

Chapter 2 • Hydran 201T
i
Intelligent Transmitter
2-2 Rev. 6, March 2011 Part 17997
• A DB-9 connector for local RS-232 serial communication with a host computer running
the Hydran Host software
• Serial communication with a Hydran 201C i Controller through a supervisory link
(communication cable between a H201T i and a H201C i )
• Full stand-alone capabilities when the host computer (running the Hydran Host software)
is not used
• A very wide temperature range for all-weather outdoor operation
• A thermal regulating system
• Terminal blocks to connect the following components:
– ac power supply
– Alarm contacts (gas High and High-High, and system fail alarms)
– Analog output
• A termination board to connect the H201C i and the H201T i with a supervisory link
2.2 ENCLOSURE
The Hydran 201T i ’s enclosure (see Figure 1-1 on page 1-3) is 186 mm (7.3 in) in diameter
by 180 mm (7.125 in) in length; for details, see Figure B-1 on page B-1. It serves three
functions:
• To provide mechanical and weather protections for the Hydran 201 sensor and the
H201T i ’s electronic circuits
• To maintain the H201 sensor and the H201T i 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
2.3 EXTERNAL COMPONENTS
Here is a description of the Hydran 201T i ’s external components (see Figure 2-1 on
page 2-3):
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 2.4.4 on page 2-7).
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).