2.2.3 Hydran 201Ci-1 One Channel Controller
The Hydran 201Ci-1 (Figure 2-3 below) is a full one-channel controller. When used
with the Hydran 201Ti Intelligent Transmitter, the combination is called a Hydran 201R
Model i (see the picture on the front cover of this manual). It uses a heated Type NEMA
4X instrument cabinet and contains a single electronic circuit board. The digital/analog
board handles communications tasks and provides display, alarm and analog output
functions.
Figure 2-3: Hydran 201Ci-1 One-Channel Controller
Two terminal block stripes are provided for easy connection of: ac power; alarm
contacts (Gas High, Gas High-High and System Fail); configurable isolated analog output;
and isolated supervisory link to the Hydran 201Ti Intelligent Transmitter. Connectors are
used for communications: RS-232 or USB to a computer or optional modem, and RS-485
to other Hydran 201Ci Controllers.
A large LED digital display shows the gas concentration in ppm. Two gas alarm
indicators are mounted on the front door.
The H201Ci-1 is described in detail in Section 4.2.
2.2.4 Hydran Host Software
General Electric’s Hydran Host software provides a simple interface between one or
more Hydran 201Ti Intelligent Transmitters and an IBM PC (or compatible), through a
standard USB communication port (Type B connector). Optional modems allow the
communication to be carried over public telephone lines.
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